Question 1: Which of the following is most likely to increase the efficacy of hemodialysis in a dialysis patient who is very large in both stature and weight?

• Increase dialyzer size. (Correct answer)
• Change to peritoneal dialysis.
• Increase salt restriction.
• Decrease treatment time.

Correct answer: Increase dialyzer size.

An increase in the dialyzer size because it promotes the clearance of waste products is the intervention that is most likely to improve hemodialysis effectiveness in patients who are very large in both stature and weight. Based on the patient's size and the recommended length of treatment, the nephrologist determines the size of the dialyzer. Increasing the length of treatment is another technique that can improve the efficacy of hemodialysis.

Question 2: During dialysis, the blood leak detector alarm activates. What does this indicate and what action should be taken?

• Blood is crossing into the dialysate side; stop treatment and do not return blood (Correct answer)
• Patient blood pressure is dropping; administer saline bolus
• The arterial needle has dislodged; reinsert immediately
• The dialysate is too concentrated; dilute with water

Correct answer: Blood is crossing into the dialysate side; stop treatment and do not return blood

A blood leak detector alarm means dialyzer membrane rupture has occurred; blood must not be returned to the patient due to risk of contamination.

Question 3: Before a reprocessed dialyzer is used for a patient's treatment, what is the most critical final check that must be performed at the patient's station?

• Verifying the TCV is above 90%
• Testing for residual sterilant (Correct answer)
• Confirming the original prime volume
• Checking the external casing for cracks

Correct answer: Testing for residual sterilant

It is absolutely critical to ensure that no residual sterilant remains in the dialyzer before it is connected to the patient. Exposure to even small amounts of chemicals like peracetic acid can cause serious adverse reactions, including hemolysis and anaphylaxis. This is tested for right before use.

Question 4: How should a hemodialysis treatment be terminated at the end of a session using the saline rinse-back method?

• Stop the blood pump and leave lines attached until blood clots
• Stop the pump and clamp all lines simultaneously
• Connect saline to the arterial line, rinse blood back to the patient, then remove needles (Correct answer)
• Remove needles first, then drain blood from the circuit

Correct answer: Connect saline to the arterial line, rinse blood back to the patient, then remove needles

Saline rinse-back connects saline to the arterial port, uses the blood pump to push remaining blood back to the patient, then lines are clamped and needles removed.

Question 5: What should you do if the dialysis machine alarms due to a low blood flow?

• Check for clots or kinks (Correct answer)
• Continue dialysis
• Stop dialysis immediately
• Increase the blood flow rate

Correct answer: Check for clots or kinks

A low blood flow alarm during dialysis typically indicates an obstruction or issue within the extracorporeal circuit or the patient's vascular access. Common causes include kinks in the bloodlines, clotted access, or vasospasm. The appropriate response is to investigate and resolve these mechanical issues to restore proper blood flow and ensure effective dialysis treatment.

Question 6: A patient's tunneled catheter is found to have a blood flow rate of only 180 mL/min despite the prescription of 350 mL/min. After repositioning the patient and reversing the catheter lines, flow improves minimally. What is the likely cause and appropriate next step?

• The catheter is kinked at the chest wall; call interventional radiology for catheter revision
• Catheter dysfunction from fibrin sheath or intraluminal thrombus; notify the nurse for consideration of thrombolytic therapy (Correct answer)
• Air lock in the catheter lumen; flush with normal saline using high pressure to displace the air
• The catheter tip has migrated to the subclavian vein; reassess position with ultrasound

Correct answer: Catheter dysfunction from fibrin sheath or intraluminal thrombus; notify the nurse for consideration of thrombolytic therapy

Poor blood flow despite adequate positioning suggests catheter dysfunction from fibrin sheath formation (a layer of fibrinous material covering the catheter tip, limiting blood aspiration) or intraluminal thrombus. Thrombolytic therapy (tissue plasminogen activator, tPA) is the first-line intervention.

Question 7: What action should be taken if a patient develops chest pain during dialysis?

• Adjust blood flow rate
• Notify the nurse or physician immediately (Correct answer)
• Continue treatment
• Give pain medication

Correct answer: Notify the nurse or physician immediately

If a patient develops chest pain during dialysis, the technician must immediately notify the nurse or physician. Chest pain can be a symptom of serious cardiac events, such as angina or myocardial infarction, or other critical complications like an air embolism. Prompt medical assessment and intervention are essential to ensure patient safety and prevent further harm.

Question 8: Which reagent is used in the standard colorimetric test to check for free chlorine residual in dialysis water?

• DPD (N,N-diethyl-p-phenylenediamine) (Correct answer)
• Orthotoluidine
• Phenolphthalein
• Sodium thiosulfate

Correct answer: DPD (N,N-diethyl-p-phenylenediamine)

DPD reacts with free chlorine to produce a pink-to-red color, allowing a rapid and accurate colorimetric measurement. It is the AAMI-recommended method for verifying that carbon tank effluent meets the safe chlorine limit (≤0.1 mg/L) before dialysis begins.

Question 9: Before returning a reprocessed dialyzer to a patient, which test must be performed to ensure patient safety?

• Germicide residual test (Correct answer)
• Blood leak detector calibration
• Ultrafiltration coefficient verification
• Dialysate conductivity test

Correct answer: Germicide residual test

A germicide residual test must be performed to confirm that germicide levels in the dialyzer are below the safe threshold before use. Exposing a patient to residual germicide can cause serious adverse reactions including hemolysis and cardiovascular compromise.

Question 10: Which of the following is the earliest and most reliable sign of needle infiltration during a hemodialysis treatment?

• Blood appearing in the arterial drip chamber
• Localized swelling and pain at the needle insertion site (Correct answer)
• A sudden drop in the venous pressure alarm
• An increase in the arterial pressure alarm above baseline

Correct answer: Localized swelling and pain at the needle insertion site

Infiltration occurs when the needle tip exits the vessel lumen into surrounding tissue. The immediate result is extravasation of blood or dialysate, causing localized swelling, firmness, and pain at the site. Pressure alarms may change secondarily but are not as specific or early an indicator.

Question 11: What is the function of heparin in dialysis?

• Prevent clotting (Correct answer)
• Aid in filtration
• Lower blood pressure
• Increase dialysate flow

Correct answer: Prevent clotting

Heparin is an anticoagulant administered during hemodialysis to prevent blood from clotting within the extracorporeal circuit, which includes the bloodlines and dialyzer. Without heparin, the blood would clot in the tubing, rendering the treatment ineffective and potentially causing significant blood loss. It ensures a smooth and continuous flow of blood for efficient filtration.

Question 12: A patient reports feeling dizzy and their blood pressure has dropped to 90/50 mmHg. What is the most appropriate initial intervention?

• Increase the blood flow rate
• Increase the ultrafiltration rate
• Encourage the patient to drink water
• Place the patient in the Trendelenburg position (Correct answer)

Correct answer: Place the patient in the Trendelenburg position

The symptoms and significant drop in blood pressure indicate hypotension. Placing the patient in the Trendelenburg position (feet elevated above the head) is a rapid first response that uses gravity to increase blood flow to the brain and vital organs while other interventions, like administering saline, are prepared.

Question 13: What does the conductivity monitor on a hemodialysis machine measure, and why is it critical?

• Pressure in the venous blood line
• Flow rate of dialysate through the circuit
• Concentration of electrolytes in the dialysate solution (Correct answer)
• Temperature of the blood returning to the patient

Correct answer: Concentration of electrolytes in the dialysate solution

Conductivity measures the total ionic concentration (electrolyte content) of the dialysate, ensuring the correct concentration for safe treatment.

Question 14: Which chemical is most commonly used as a germicide during manual dialyzer reprocessing?

• Glutaraldehyde
• Bleach (sodium hypochlorite)
• Peracetic acid (Correct answer)
• Formaldehyde

Correct answer: Peracetic acid

Peracetic acid (PAA) is the most commonly used germicide for dialyzer reprocessing because it is effective, relatively safe, and dissipates rapidly. Formaldehyde was historically used but has largely been replaced due to health hazards.

Question 15: When creating a buttonhole tract, how many consecutive cannulations are usually required before the tract is adequately formed?

• 8 to 10 (Correct answer)
• 10 to 12
• 4 to 5
• 5 to 8

Correct answer: 8 to 10

When establishing a buttonhole cannulation tract, it typically requires 8 to 10 consecutive cannulations using the exact same angle and depth. This consistent technique helps to create a stable, well-formed tunnel or tract, which makes future cannulations easier, less painful, and potentially reduces the risk of complications like infiltrations or infections.

Question 16: A dialysis machine is set up to use 36.1X parts dialysate. If the concentrate proportioning ratio calls for 1.00 part acid and 1.10 parts bicarbonate, how many parts of water are needed?

• 34.0 (Correct answer)
• 36.1
• 31.9
• 33.0

Correct answer: 34.0

The total dialysate proportioning ratio is given as 36.1 parts. The concentrate proportioning calls for 1.00 part acid and 1.10 parts bicarbonate. To determine the parts of water needed, subtract the concentrate parts from the total parts: 36.1 (total) - 1.00 (acid) - 1.10 (bicarbonate) = 34.0 parts of water. This calculation ensures the correct dilution for the dialysate mixture.

Question 17: What can dialysis staff do to reduce the risk of being infected with a blood-borne pathogen?

• All of the above (Correct answer)
• Proper hand washing
• Universal precautions
• Proper sharps disposal

Correct answer: All of the above

Reducing the risk of blood-borne pathogen infection requires a multi-faceted approach. Proper hand washing is fundamental for hygiene, universal precautions dictate treating all blood and body fluids as infectious, and proper sharps disposal prevents needlestick injuries. Implementing all these measures collectively provides comprehensive protection for dialysis staff against blood-borne pathogens.

Question 18: Which of the following is a key difference between 'heparin-free' dialysis and standard anticoagulated dialysis?

• Heparin-free dialysis is only used for CRRT
• Heparin-free dialysis relies on frequent saline flushes and higher blood flow to minimize clotting (Correct answer)
• Heparin-free dialysis uses citrate in the dialysate
• Heparin-free dialysis requires a different dialyzer type

Correct answer: Heparin-free dialysis relies on frequent saline flushes and higher blood flow to minimize clotting

In heparin-free dialysis, clotting is minimized by using frequent normal saline flushes and maintaining high blood flow rates rather than systemic anticoagulation.

Question 19: Which electrolyte imbalance is most likely to cause a dialysis patient to experience tetany (involuntary muscle contractions)?

• Hypermagnesemia
• Hypocalcemia (Correct answer)
• Hyperkalemia
• Hypernatremia

Correct answer: Hypocalcemia

Hypocalcemia causes increased neuromuscular excitability, leading to tetany, muscle spasms, and potentially seizures.

Question 20: The technician may divulge his or her password to ____________ if a dialysis facility uses electronic charting.

• no one. (Correct answer)
• supervisor.
• nephrologist.
• nurse.

Correct answer: no one.

When computerized charting is used at a dialysis facility, the technician shouldn't divulge their password to anyone. Each staff member who is permitted to access a patient's or patients' electronic health record should have their own password. According to the user's password, access to the records is electronically monitored. A staff member should never have access to the files of a patient for whom they are not providing care because doing so is against the Health Insurance Portability and Accountability Act of 1996.

Question 21: A dialyzer arrives at the reprocessing area and is found to have a crack in the header cap. What is the correct action?

• Repair the crack with medical-grade adhesive before reprocessing
• Quarantine the dialyzer and notify the supervisor for assessment
• Discard the dialyzer immediately without reprocessing (Correct answer)
• Reprocess the dialyzer if TCV and pressure tests are within normal limits

Correct answer: Discard the dialyzer immediately without reprocessing

A cracked header cap compromises the structural integrity of the dialyzer and creates a potential pathway for contamination and blood leakage. The dialyzer must be discarded immediately—no reprocessing is appropriate for a physically damaged dialyzer.

Question 22: What is the recommended angle of needle insertion when cannulating a mature arteriovenous fistula?

• 25–35 degrees (Correct answer)
• 90 degrees perpendicular to the skin
• 5–10 degrees
• 45–60 degrees

Correct answer: 25–35 degrees

A 25–35 degree insertion angle allows the needle to enter the vessel lumen cleanly without going through the back wall. Shallower angles risk staying subcutaneous, while steeper angles increase the risk of posterior wall puncture and infiltration.

Question 23: What is the minimum acceptable total cell volume (TCV) for a reprocessed dialyzer to be approved for reuse?

• 95% of the original TCV
• 70% of the original TCV
• 90% of the original TCV
• 80% of the original TCV (Correct answer)

Correct answer: 80% of the original TCV

AAMI guidelines require that a reprocessed dialyzer retain at least 80% of its original total cell volume (TCV). A dialyzer that falls below this threshold must be discarded because reduced fiber volume indicates inadequate clearance capability.

Question 24: The technician is reinforcing a patient's training regarding the management of fluid intake. The patient, who still urinates, has a base of 1000 ml intake per day. If the patient urinates 500 ml in a 24-hour period, how much fluid is the patient allowed the following day?

• 1000 ml
• 1500 ml (Correct answer)
• 500 ml
• 2000 ml

Correct answer: 1500 ml

For patients who still urinate, fluid allowance is typically calculated by adding their 24-hour urine output to a base amount, often 500-1000 ml. In this scenario, the patient has a base intake of 1000 ml and urinates 500 ml. Therefore, the allowed fluid intake for the following day is 1000 ml (base) + 500 ml (urine output) = 1500 ml, helping to maintain fluid balance.

Question 25: The required contact time for dialyzer reprocessing in a dialysis facility using peracetic acid as the germicide is ____________.

• 24 hours.
• 20 hours.
• 10 hours.
• 11 hours. (Correct answer)

Correct answer: 11 hours.

The required contact time for dialyzer reprocessing at a dialysis facility using peracetic acid as the germicide is 11 hours. There are four primary forms of germicides, but only one can be used at a time: heat disinfection (with citric acid) (20 hours contact time), glutaraldehyde (10 hours contact time), formaldehyde (24 hours contact time), and peracetic acid (most frequently used). Although peracetic acid is more expensive than the majority of other germicides, it is less dangerous for users than formaldehyde or glutaraldehyde.

Question 26: Which of the following is a sign of central venous stenosis in a patient with an arteriovenous fistula in the ipsilateral arm?

• High venous return pressures during dialysis without arm swelling
• Edema of the entire arm, shoulder, neck, and face on the same side as the fistula (Correct answer)
• Hypotension during dialysis caused by high fistula flow
• Thrombosis of the fistula within the first month of creation

Correct answer: Edema of the entire arm, shoulder, neck, and face on the same side as the fistula

Central venous stenosis (narrowing of the subclavian, brachiocephalic, or superior vena cava) impairs venous drainage from the entire upper extremity. When an ipsilateral AV fistula increases venous blood flow, the obstruction causes dramatic arm, shoulder, neck, and facial edema on the affected side.

Question 27: What is the primary reason dialyzer reuse programs require each patient to have their own dedicated dialyzer?

• To prevent cross-contamination and bloodborne pathogen transmission between patients (Correct answer)
• To allow more accurate TCV measurements
• To reduce the cost of dialyzer replacement
• To comply with insurance billing requirements

Correct answer: To prevent cross-contamination and bloodborne pathogen transmission between patients

Each patient must have their own dedicated dialyzer to prevent cross-contamination with bloodborne pathogens such as HIV, hepatitis B, and hepatitis C. Sharing dialyzers between patients is strictly prohibited regardless of reprocessing.

Question 28: Which physical finding during pre-treatment assessment most specifically indicates arterial steal syndrome in a patient with a new upper arm AVF?

• Edema in the ipsilateral hand
• Elevated blood pressure in the access arm
• Diminished thrill in the fistula
• Cold, pale hand that warms when the fistula is manually compressed (Correct answer)

Correct answer: Cold, pale hand that warms when the fistula is manually compressed

Hand ischemia (cold, pale) that resolves when the fistula is compressed (reducing steal) is pathognomonic for arterial steal syndrome.

Question 29: The technician's permitted responsibilities mostly depend on the ______.

• Centers for Medicare & Medicaid Services guidelines.
• technician’s training.
• dialysis center guidelines.
• state regulations/standards of practice. (Correct answer)

Correct answer: state regulations/standards of practice.

The tasks that the technician is permitted to perform are generally governed by state laws and professional norms of conduct. Despite the fact that trained technicians should get comparable training, several states forbid cannulating accesses and giving intravenous heparin to technicians. Always be aware of what is legal in the state where you are working, as a technician. Even if a state permits a technician to perform specific tasks (such giving heparin injections), a dialysis facility may further limit the technician's function.

Question 30: What is the significance of dialysis adequacy targets (Kt/V 1.4 or greater) from a quality perspective, and how does this metric drive facility performance?

• Kt/V is measured only for research purposes
• Facilities must achieve Kt/V of 2.0 or greater for all patients
• Kt/V measures dialysis dose delivery; facilities must achieve 1.4 or greater for 65% or more of patients as a CMS performance standard (Correct answer)
• Kt/V is a billing metric only and has no clinical significance

Correct answer: Kt/V measures dialysis dose delivery; facilities must achieve 1.4 or greater for 65% or more of patients as a CMS performance standard

CMS requires dialysis facilities to achieve Kt/V 1.4 or greater in at least 65% of patients as a quality performance standard that affects facility payment and surveys.

Question 31: Which AAMI standard specifically governs dialyzer reprocessing for hemodialysis?

• AAMI RD5
• AAMI TIR34
• AAMI RD52 (Correct answer)
• AAMI RD47

Correct answer: AAMI RD52

ANSI/AAMI RD52 is the standard that specifically addresses the reuse of hemodialyzers, outlining requirements for cleaning, testing, germicide use, documentation, and quality assurance in dialyzer reprocessing programs.

Question 32: A dialysis facility's monthly water culture result shows a bacterial count of 75 CFU/mL. What action is required?

• No action needed; this is within AAMI acceptable limits
• This exceeds the maximum limit (200 CFU/mL) and patient treatments must be halted immediately
• This exceeds the action level (50 CFU/mL) and requires investigation, corrective action, and resampling (Correct answer)
• Increase the frequency of water testing to weekly and continue patient treatments

Correct answer: This exceeds the action level (50 CFU/mL) and requires investigation, corrective action, and resampling

A bacterial count of 75 CFU/mL exceeds the AAMI action level of 50 CFU/mL but is below the maximum limit of 200 CFU/mL. This requires a formal investigation, corrective action (such as system disinfection), and re-testing to confirm the count returns below the action level.

Question 33: When using bleach (sodium hypochlorite) as a cleaning agent in dialyzer reprocessing, what is the primary hazard to the patient if residual bleach is not adequately removed?

• Intravascular hemolysis (Correct answer)
• Hypoglycemia
• Severe hypertension
• Metabolic alkalosis

Correct answer: Intravascular hemolysis

Residual sodium hypochlorite (bleach) in the blood compartment can cause intravascular hemolysis, destroying red blood cells and leading to hemolytic anemia, hemoglobinemia, and potentially renal tubular damage in any remaining kidney function. This is a serious and potentially fatal complication.

Question 34: What is the minimum recommended distance between the arterial and venous needles during AV fistula cannulation to minimize recirculation?

• 1 cm
• 2 cm
• 10 cm
• 5 cm (Correct answer)

Correct answer: 5 cm

Placing needles at least 5 cm (approximately 2 inches) apart prevents recirculation, which occurs when already-dialyzed blood is immediately re-drawn into the arterial needle. Recirculation reduces treatment adequacy and Kt/V.

Question 35: When assessing a patient's vascular access before cannulation, which finding requires withholding cannulation and notifying the charge nurse?

• A large, firm, non-compressible hematoma directly over the intended needle sites (Correct answer)
• A palpable thrill extending along the fistula
• A faint bruit heard on auscultation
• Mild warmth of the skin overlying the fistula

Correct answer: A large, firm, non-compressible hematoma directly over the intended needle sites

A firm hematoma over the cannulation site poses a bleeding risk if needled and may indicate recent infiltration or traumatic injury requiring evaluation before proceeding.

Question 36: A patient experiences cardiac arrest with no pulse or respiration during hemodialysis. After the technician calls for help, the next action should be to:

• Stop dialysis, return blood, and flush access lines with normal saline.
• Perform chest compressions immediately. (Correct answer)
• Assess the patient's blood pressure.
• Administer oxygen via a mask.

Correct answer: Perform chest compressions immediately.

In a cardiac arrest situation with no pulse or respiration, the immediate priority after calling for help is to initiate cardiopulmonary resuscitation (CPR). Chest compressions are the most critical component of CPR, as they circulate blood to vital organs like the brain and heart. Delaying compressions to perform other actions would significantly reduce the patient's chances of survival.

Question 37: What should be done if dialysis equipment becomes contaminated during treatment?

• Clean and disinfect the equipment before use (Correct answer)
• Notify the patient immediately
• Use the equipment without cleaning
• Place the equipment in storage

Correct answer: Clean and disinfect the equipment before use

If dialysis equipment becomes contaminated during treatment, it must be thoroughly cleaned and disinfected according to established protocols before it can be safely used again. This critical step eliminates pathogens and prevents cross-contamination, protecting both patients and healthcare workers from potential infections. Using contaminated equipment poses a significant health risk.

Question 38: What is the function of a deionizer (DI unit) in a dialysis water treatment system?

• Kill microorganisms by exposing water to high-intensity ultraviolet light
• Remove residual chlorine through catalytic reduction
• Reduce water pressure to a safe level before it enters the RO membrane
• Exchange cations and anions in water for hydrogen and hydroxyl ions, producing highly purified water (Correct answer)

Correct answer: Exchange cations and anions in water for hydrogen and hydroxyl ions, producing highly purified water

A deionizer contains mixed-bed ion exchange resin that replaces dissolved cations (e.g., sodium, calcium) with H⁺ ions and dissolved anions (e.g., chloride, sulfate) with OH⁻ ions. The H⁺ and OH⁻ combine to form water, removing nearly all ionic contamination. Resistivity or conductivity monitoring indicates when the resin is exhausted.

Question 39: A family member asks how they can support their loved one on dialysis. What is the most beneficial form of support to encourage?

• Preparing high-protein, low-potassium meals together (Correct answer)
• Encouraging the patient to skip sessions if feeling well
• Reminding the patient to take all OTC vitamins
• Advising the patient to drink extra fluids to stay hydrated

Correct answer: Preparing high-protein, low-potassium meals together

Family support in meal preparation helps patients adhere to the renal diet, which is crucial for managing ESRD complications.

Question 40: The first step in treating malnutrition in a dialysis patient is usually to ____________.

• provide intradialytic parenteral nutrition
• provide various dietary supplements
• provide total parenteral nutrition
• encourage the patient to eat more (Correct answer)

Correct answer: encourage the patient to eat more

Malnutrition is common in dialysis patients due to dietary restrictions, loss of appetite, and catabolism. The initial and most fundamental step in addressing malnutrition is to encourage and educate the patient on increasing their oral intake of appropriate foods. This approach is less invasive and often more sustainable than supplements or parenteral nutrition, which are typically considered if dietary modifications are insufficient.

Question 41: What is the primary mechanism by which a reverse osmosis (RO) system purifies dialysis water?

• Ion exchange resin that traps dissolved minerals
• Forcing water through a semi-permeable membrane under pressure, rejecting 90–99% of dissolved solutes (Correct answer)
• Activated carbon adsorption of heavy metals and ions
• Ultraviolet light that breaks down organic contaminants

Correct answer: Forcing water through a semi-permeable membrane under pressure, rejecting 90–99% of dissolved solutes

The RO system uses hydraulic pressure to push water through a semi-permeable membrane. The membrane's pore size is small enough to reject most dissolved ions, organics, bacteria, and endotoxins, producing highly purified product water while concentrating contaminants in a reject stream.

Question 42: What is the recommended action if there is an air embolism during dialysis?

• Increase blood flow rate
• Administer oxygen
• Place the patient in Trendelenburg position (Correct answer)
• Continue dialysis

Correct answer: Place the patient in Trendelenburg position

In the event of an air embolism during dialysis, placing the patient in the Trendelenburg position (head down, feet up) on their left side is a critical intervention. This position helps to trap air in the right ventricle, preventing it from entering the pulmonary circulation and reducing the risk of air traveling to the brain or lungs, allowing time for the air to be absorbed or aspirated.

Question 43: During the reprocessing procedure, what is the purpose of the 'reverse ultrafiltration' step?

• To measure the total cell volume of the blood compartment
• To test for leaks in the membrane by applying positive pressure
• To force cleaning agents from the dialysate compartment to the blood compartment (Correct answer)
• To sterilize the outside of the dialyzer casing

Correct answer: To force cleaning agents from the dialysate compartment to the blood compartment

Reverse ultrafiltration pushes fluid (water and cleaning agents) in the opposite direction of normal dialysis flow, from the dialysate compartment into and through the blood compartment. This helps to dislodge and flush out protein deposits and blood residue from the inner surface of the hollow fiber membranes, ensuring a more thorough cleaning.

Question 44: A patient receiving hemodialysis develops sudden loss of consciousness and is unresponsive. What is the first step in the emergency response?

• Return the patient's blood immediately before calling for help
• Call for help and activate the emergency response system (call code) (Correct answer)
• Lower the patient's chair and elevate the legs
• Administer 50% dextrose IV in case of hypoglycemia

Correct answer: Call for help and activate the emergency response system (call code)

When a patient becomes unresponsive, the first priority is calling for help and activating the emergency response system. The patient needs immediate assessment and potentially CPR, defibrillation, or other advanced interventions that require a team response.

Question 45: What is the recommended daily protein intake for a stable adult hemodialysis patient?

• 1.0–1.2 g/kg/day with at least 50% from high biological value sources (Correct answer)
• 0.6–0.8 g/kg/day (same as CKD non-dialysis)
• 2.0–2.5 g/kg/day to compensate for dialysis losses
• 0.4 g/kg/day to minimize uremia

Correct answer: 1.0–1.2 g/kg/day with at least 50% from high biological value sources

KDOQI and NKF guidelines recommend 1.0–1.2 g/kg/day of dietary protein for stable maintenance hemodialysis patients, with at least 50% from high biological value (HBV) sources. Hemodialysis patients have higher protein needs than non-dialyzed CKD patients because amino acids are lost during dialysis.

Question 46: When caring for a patient with a tunneled central venous catheter (TCC) used for hemodialysis, what is the primary advantage of the tunneled design over a non-tunneled catheter?

• Tunneled catheters allow higher blood flow rates
• Tunneled catheters can be inserted at the bedside without imaging guidance
• The subcutaneous tunnel and Dacron cuff reduce infection risk by creating a physical barrier to bacterial migration (Correct answer)
• Tunneled catheters last only 2 to 4 weeks before requiring replacement

Correct answer: The subcutaneous tunnel and Dacron cuff reduce infection risk by creating a physical barrier to bacterial migration

The subcutaneous tunnel creates a barrier that bacteria must traverse to reach the bloodstream, and the Dacron cuff stimulates tissue ingrowth that further seals the tunnel.

Question 47: How many consecutive cannulations are typically necessary to form a buttonhole tract before it is sufficiently formed?

• 4 to 5.
• 8 to 10. (Correct answer)
• 5 to 8.
• 10 to 12.

Correct answer: 8 to 10.

Usually 8 to 10 consecutive cannulations are needed to establish a buttonhole tract before it is complete. It is crucial that the same individual do the cannulations throughout this development phase because doing so increases the likelihood that the same angle will be applied each time. Grafts cannot be operated on using the buttonhole technique because they lack the muscle fibers that constrict around the tract once the needle is removed.

Question 48: Which of the following is a function of the End-Stage Renal Disease Networks?

• Help resolve patient-staff conflicts. (Correct answer)
• Pay for patient services.
• Provide the pay-for-performance program.
• Set Centers for Medicare & Medicaid Services standards of care.

Correct answer: Help resolve patient-staff conflicts.

End-Stage Renal Disease (ESRD) Networks are federally mandated organizations that oversee the quality of care for dialysis patients within specific geographic regions. One of their key functions is to provide a mechanism for resolving patient grievances and conflicts, including those between patients and staff. They act as an impartial third party to ensure patient rights are upheld and concerns are addressed appropriately.

Question 49: What is the primary purpose of the CCHT certification credential?

• To satisfy a federal licensing requirement for all hemodialysis technicians
• To demonstrate competency and national standardized knowledge in hemodialysis technology (Correct answer)
• To allow technicians to independently prescribe dialysis parameters without physician oversight
• To enable technicians to perform independent vascular access surgery

Correct answer: To demonstrate competency and national standardized knowledge in hemodialysis technology

The CCHT credential, awarded by the Nephrology Nursing Certification Commission (NNCC), demonstrates that the technician has met national standards of knowledge and competency in hemodialysis technology. It is a professional certification, not a federal license, though some states require it for employment.

Question 50: What should you check after dialysis has finished?

• Dispose of dialysis equipment
• All of the above (Correct answer)
• Check for signs of bleeding (Correct answer)
• Ensure the patient is stable

Correct answer: All of the above

After dialysis has finished, it is critically important to check for signs of bleeding, particularly at the vascular access site. Anticoagulants used during the treatment can increase the risk of post-dialysis bleeding. While ensuring patient stability and proper equipment disposal are also important, actively monitoring for bleeding is a direct safety measure to prevent immediate complications.

Question 51: What is the first step in preparing a dialysis machine for treatment?

• Start dialysate flow
• Check the machine settings and perform safety checks (Correct answer)
• Begin blood pump operation
• Insert the needles into the patient

Correct answer: Check the machine settings and perform safety checks

Before connecting a patient to the dialysis machine, ensuring its proper and safe operation is paramount. This involves verifying all machine settings, performing necessary safety checks, and confirming alarm functionality. This critical first step prevents potential harm to the patient and guarantees that the treatment will be delivered accurately and effectively according to the prescription.

Question 52: When setting up the extracorporeal circuit, why is it important to prime the blood lines with saline before connecting to the patient?

• Priming activates the dialyzer membrane
• Saline warms the tubing to body temperature
• Priming removes air from the circuit and tests for leaks before blood enters (Correct answer)
• Saline pre-heparinizes the circuit

Correct answer: Priming removes air from the circuit and tests for leaks before blood enters

Priming removes air bubbles from blood lines and the dialyzer, and allows visual inspection for leaks or defects before the patient is connected.

Question 53: What is the purpose of the dialyzer in the dialysis machine?

• To remove toxins and fluid from blood (Correct answer)
• To administer medications
• To monitor blood pressure
• To detect air in the blood

Correct answer: To remove toxins and fluid from blood

The dialyzer, often referred to as the artificial kidney, is the core component where the actual purification of blood takes place. It contains a semi-permeable membrane that allows waste products and excess fluid to pass from the patient's blood into the dialysate solution, while retaining essential blood cells and proteins. This process mimics the natural filtering function of healthy kidneys.

Question 54: What is the appropriate intervention for a patient with signs of an allergic reaction during dialysis?

• Continue monitoring only
• Give heparin
• Stop dialysis and notify nurse (Correct answer)
• Slow blood pump

Correct answer: Stop dialysis and notify nurse

If a patient shows signs of an allergic reaction during dialysis, the immediate and appropriate intervention is to stop dialysis and notify the nurse or physician. Allergic reactions can rapidly escalate to severe anaphylaxis, requiring prompt cessation of exposure to the suspected allergen and immediate medical intervention. Continuing treatment could worsen the patient's condition.

Question 55: At the end of a hemodialysis treatment, which of the following assessments is essential before the patient is discharged?

• Obtain a post-dialysis BUN specimen on every patient at every treatment
• Perform a full 12-lead ECG regardless of symptoms
• Confirm the dialyzer reuse count for the next treatment
• Obtain post-dialysis vital signs, post-dialysis weight, and assess the patient's clinical status for safe discharge (Correct answer)

Correct answer: Obtain post-dialysis vital signs, post-dialysis weight, and assess the patient's clinical status for safe discharge

Essential post-treatment assessments include post-dialysis vital signs (to confirm hemodynamic stability), post-dialysis weight (to verify target weight achievement), and clinical assessment of the patient's status before they leave the facility.

Question 56: What is the purpose of the deaeration chamber system in a hemodialysis machine?

• Remove dissolved gases from dialysate before patient contact (Correct answer)
• Cool the dialysate to proper temperature
• Measure dialysate flow rate
• Remove bacteria from dialysate

Correct answer: Remove dissolved gases from dialysate before patient contact

The deaeration system removes dissolved gases (primarily CO2 and O2) from dialysate to prevent microbubble formation that could damage the dialyzer membrane.

Question 57: Which sign indicates a problem with vascular access that needs immediate attention?

• Absence of thrill or bruit (Correct answer)
• Feeling of vibration
• Mild warmth over access site
• Pulsatile sound

Correct answer: Absence of thrill or bruit

A thrill (palpable vibration) and a bruit (audible whooshing sound) are crucial indicators of adequate blood flow through a vascular access. Their absence suggests a potential problem like thrombosis (clotting) or stenosis (narrowing), which can compromise the access and prevent effective dialysis. Immediate attention is required to assess and address such issues to preserve the access.

Question 58: What is the primary purpose of the softener in the dialysis water treatment system?

• To remove chlorine and chloramines from the water supply
• To adjust the pH of the water to dialysate range
• To eliminate bacteria and endotoxins from the water
• To remove calcium and magnesium ions to prevent scaling and protect the reverse osmosis membrane (Correct answer)

Correct answer: To remove calcium and magnesium ions to prevent scaling and protect the reverse osmosis membrane

The water softener exchanges calcium and magnesium ions (which cause 'hardness') for sodium ions using a cation exchange resin. This prevents scaling and mineral deposit buildup in pipes, the reverse osmosis membrane, and dialysis machines.

Question 59: What is the role of the ultrafiltration pump in dialysis?

• To monitor the patient's blood pressure
• To prevent blood clots
• To remove excess fluid from blood (Correct answer)
• To increase blood flow

Correct answer: To remove excess fluid from blood

The ultrafiltration pump plays a specific role in dialysis by precisely controlling the rate at which excess fluid is removed from the patient's blood. By creating a pressure gradient across the dialyzer membrane, it ensures that the correct amount of water is extracted, preventing fluid overload and its associated complications like hypertension and pulmonary edema.

Question 60: Which sign or symptom should a patient be taught to report immediately to their dialysis care team?

• Mild muscle cramps during dialysis
• Slightly reduced appetite
• Rapid weight gain of 3 or more pounds overnight (Correct answer)
• Mild fatigue after treatment

Correct answer: Rapid weight gain of 3 or more pounds overnight

Rapid weight gain (3+ lbs overnight) indicates significant fluid retention and potential fluid overload, which requires prompt medical evaluation.

Question 61: Which of the following is a genetic (inherited) disease that can lead to kidney failure?

• Polycystic kidney disease (Correct answer)
• Diabetes mellitus, type 2
• Pyelonephritis
• Glomerulonephritis

Correct answer: Polycystic kidney disease

Polycystic kidney disease (PKD) is a genetic disorder characterized by the growth of numerous fluid-filled cysts in the kidneys. These cysts gradually enlarge and impair kidney function, eventually leading to kidney failure in many individuals. It is one of the most common inherited causes of end-stage renal disease.

Question 62: What is the target range for serum intact parathyroid hormone (iPTH) in patients on maintenance hemodialysis?

• 600–1000 pg/mL
• 1000–1500 pg/mL
• 150–600 pg/mL (2–9 times the upper limit of normal) (Correct answer)
• 10–65 pg/mL (normal range for healthy adults)

Correct answer: 150–600 pg/mL (2–9 times the upper limit of normal)

KDIGO guidelines recommend targeting iPTH levels 2–9 times the upper limit of normal for the assay used, which for most laboratories corresponds to approximately 150–600 pg/mL. This range balances suppression of excessive bone remodeling against the risks of adynamic bone disease from over-suppression.

Question 63: What does the UF goal represent and how is it determined for each treatment?

• The maximum blood flow rate achievable during treatment
• The volume of saline to be administered during treatment
• The total volume of fluid to be removed, calculated from weight gain since last treatment (Correct answer)
• The dialyzer clearance capacity for urea

Correct answer: The total volume of fluid to be removed, calculated from weight gain since last treatment

The UF goal is the total fluid volume to be removed, determined by subtracting the patient's dry weight from their current pre-dialysis weight.

Question 64: A patient on hemodialysis is prescribed a phosphate binder. When is the most effective time for the patient to take this medication?

• At bedtime
• 1 hour after meals
• 30 minutes before meals
• With meals (Correct answer)

Correct answer: With meals

Phosphate binders work by binding to phosphorus in food while it is in the gastrointestinal tract, preventing its absorption into the bloodstream. Taking them with meals ensures they are present when the dietary phosphorus is ingested, maximizing their effectiveness.

Question 65: Which type of hemodialysis vascular access carries the highest risk of bloodstream infection?

• Native arteriovenous fistula
• Subcutaneous port-catheter device
• Synthetic arteriovenous graft
• Tunneled cuffed central venous catheter (Correct answer)

Correct answer: Tunneled cuffed central venous catheter

Tunneled cuffed central venous catheters (CVCs) have the highest infection risk among hemodialysis accesses because the catheter provides a direct conduit from the skin surface into the central venous system, bypassing natural skin and vascular barriers. Native AV fistulas have the lowest infection rates and are the preferred access.

Question 66: What does a failed pressure test during dialyzer reprocessing indicate?

• There is residual sterilant present
• The dialyzer is excessively clotted
• A leak in the dialyzer membrane (Correct answer)
• The TCV is too low for reuse

Correct answer: A leak in the dialyzer membrane

A pressure test, or leak test, checks the integrity of the hollow fiber membrane. If the dialyzer cannot hold a set pressure, it signifies a leak, which could allow non-sterile dialysate to mix with the patient's blood, posing a significant risk of infection and blood loss.

Question 67: Why must hemodialysis machines undergo disinfection between patient treatments?

• To remove mineral deposits that reduce machine efficiency
• To recalibrate the pressure sensors for accuracy
• To remove residual dialysate that would alter the next patient's treatment
• To eliminate biofilm and pathogens that could contaminate future patients' blood circuits (Correct answer)

Correct answer: To eliminate biofilm and pathogens that could contaminate future patients' blood circuits

Machine disinfection destroys biofilm and pathogens in internal fluid pathways that could contaminate blood circuits and cause bloodstream infections in subsequent patients.

Question 68: Which of the following affects access recirculation?

• Direction of needles
• Distance between the tips of the needles
• All of the above (Correct answer)
• Presence of stenosis

Correct answer: All of the above

Access recirculation occurs when dialyzed blood re-enters the arterial needle, reducing dialysis efficiency. The distance between the needle tips (too close), the presence of stenosis (narrowing) in the access, and the direction of the needles (reversed or improperly placed) all contribute to recirculation. Understanding and managing these factors are crucial for optimizing dialysis treatment and ensuring adequate solute clearance.

Question 69: Which parameter must be verified before connecting a patient to the hemodialysis machine?

• The machine's last service date
• The dialysate color and turbidity
• The patient's hemoglobin level
• Blood flow rate, dialysate flow rate, temperature, and conductivity (Correct answer)

Correct answer: Blood flow rate, dialysate flow rate, temperature, and conductivity

All dialysis prescription parameters must be verified against the patient's prescription before treatment begins.

Question 70: What is the primary role of carbon tanks in the dialysis water treatment system?

• Eliminate bacteria and endotoxins through UV irradiation
• Remove calcium and magnesium ions through ion exchange
• Adsorb chlorine and chloramines before water reaches the RO membrane (Correct answer)
• Filter out particulate matter larger than 5 microns

Correct answer: Adsorb chlorine and chloramines before water reaches the RO membrane

Carbon tanks use activated carbon to adsorb chlorine and chloramines from the feed water. These chemicals must be removed before the water contacts the reverse osmosis membrane, as they can degrade the membrane and, if they reach the patient, cause hemolytic anemia.

Question 71: Chloramine is particularly dangerous in dialysis water because it can cause which serious complication?

• Hemolytic anemia from oxidative damage to red blood cell membranes (Correct answer)
• Hypercalcemia from displacement of calcium by chlorine
• Aluminum toxicity from chloramine-aluminum complexes
• Hyperphosphatemia from chlorine interference with phosphate binders

Correct answer: Hemolytic anemia from oxidative damage to red blood cell membranes

Chloramine (a combination of chlorine and ammonia used as a disinfectant in municipal water supplies) cannot be removed by reverse osmosis and can cross the dialyzer membrane to enter the patient's blood, causing oxidative damage to red blood cell membranes and hemolytic anemia.

Question 72: What is the purpose of rotating needle insertion sites on an AV fistula?

• To make the procedure easier
• To reduce bleeding
• To avoid blood clots
• To prevent scarring and aneurysms (Correct answer)

Correct answer: To prevent scarring and aneurysms

Rotating needle insertion sites prevents repeated trauma to the same area of the AV fistula. This practice reduces the risk of scarring, which can narrow the vessel, and the formation of aneurysms, which are dangerous bulges in the vessel wall. By distributing the insertion points, the fistula's integrity is maintained, prolonging its lifespan for effective dialysis.

Question 73: The technician finds that the total chlorine level in the water is 1.1 parts per million (ppm) and the free chlorine level is 0.9 ppm while testing for the presence of chloramine. As a result, the amount of chloramine is ____________.

• 2.0 ppm.
• 4.0 ppm.
• 0.2 ppm. (Correct answer)
• 0.4 ppm.

Correct answer: 0.2 ppm.

Chloramine can be combined with ammonia to create a long-acting form of chlorine; it cannot be measured directly, but the chloramine level can be calculated by deducting the free chlorine from the total chlorine: If, when testing water for the level of chloramine, the technician finds that the total chlorine level is 1.1 parts per million (ppm) and the free chlorine level is 0.9 ppm, the chloramine level is 0.2 ppm. 1.1 - 0.9 is equal to 0.2 ppm, or 0.2 mg/L. The dialysis chloramine limit is 0.1 mg/L.

Question 74: What angle should the slide board be positioned between the two seating surfaces when a patient is being transferred from a dialysis chair to a wheelchair?

• 45 degrees. (Correct answer)
• 60 degrees.
• 90 degrees.
• 30 degrees.

Correct answer: 45 degrees.

When moving a patient from a wheelchair to a dialysis chair, a slide board should be positioned at a 45-degree angle between the two surfaces. The arm must be taken out of the wheelchair and both the dialysis chair and the wheelchair must be locked to prevent movement while being transferred. Prior to transfer, a gait belt should be fastened around the patient's waist for security.

Question 75: The complication in which blood has a "cherry pop" appearance is:

• hemolysis (Correct answer)
• None of the above
• blood leak
• air embolism

Correct answer: hemolysis

Hemolysis is the rupture or destruction of red blood cells, which releases hemoglobin into the plasma. When severe, this can give the blood a characteristic 'cherry red' or 'cherry pop' appearance due to the free hemoglobin. Hemolysis during dialysis is a serious complication that can be caused by various factors, including incorrect dialysate osmolarity, overheating of blood, or exposure to certain chemicals.

Question 76: What should be done if a needle stick injury occurs during dialysis?

• Ignore the injury if it's minor
• Wash the area and report the incident (Correct answer)
• Use antiseptic on the injury
• Continue with dialysis treatment

Correct answer: Wash the area and report the incident

A needle stick injury is a serious occupational hazard that carries a risk of transmitting bloodborne pathogens. The immediate action is to wash the affected area thoroughly with soap and water, followed by prompt reporting of the incident to supervisors. This allows for proper medical evaluation, post-exposure prophylaxis if necessary, and incident documentation to ensure worker safety.

Question 77: What information must be documented on the label of a reprocessed dialyzer?

• Patient name or ID, reuse count, and date of last reprocessing (Correct answer)
• Physician name, germicide concentration, and date of first use
• Nurse's initials, reuse count, and TCV percentage
• Patient name, dialyzer model number, and germicide brand name

Correct answer: Patient name or ID, reuse count, and date of last reprocessing

Reprocessed dialyzer labels must include the patient identifier, the reuse count, and the date of the most recent reprocessing. This information is essential for tracking and verifying the dialyzer is correctly matched to the patient and within policy limits.

Question 78: Which intervention is correct when a clot is detected in the extracorporeal circuit?

• Stop blood pump and notify nurse (Correct answer)
• Switch to saline rinse
• Flush with heparin
• Continue treatment

Correct answer: Stop blood pump and notify nurse

When a clot is detected in the extracorporeal circuit, the correct intervention is to stop the blood pump and notify the nurse immediately. A clot can obstruct blood flow, damage the dialyzer, or potentially lead to an air embolism if it dislodges. Stopping the pump prevents further complications and allows for prompt assessment and management by qualified personnel.

Question 79: What is the typical duration of a hemodialysis treatment?

• 6 to 8 hours
• 1 to 2 hours
• 2 to 3 hours
• 3 to 5 hours (Correct answer)

Correct answer: 3 to 5 hours

Hemodialysis treatments typically last 3 to 5 hours, performed three times a week. This duration is necessary to allow sufficient time for the dialyzer to effectively remove accumulated waste products, toxins, and excess fluid from the patient's blood. The specific duration is tailored to the individual patient's needs, kidney function, and fluid status to achieve optimal clearance.

Question 80: What is the primary purpose of the Total Cell Volume (TCV) or Fiber Bundle Volume (FBV) test during dialyzer reprocessing?

• To check for residual sterilant in the dialyzer
• To verify the patient's name is correctly matched to the dialyzer
• To confirm the integrity of the dialyzer membrane and check for leaks
• To ensure the dialyzer can still effectively clear waste products (Correct answer)

Correct answer: To ensure the dialyzer can still effectively clear waste products

The TCV test measures the internal volume of the hollow fibers. A significant drop in TCV, typically below 80% of the original volume, indicates that clotting or protein deposits have blocked too many fibers, reducing the dialyzer's surface area and its ability to provide adequate clearance of waste products.

Question 81: Which electrolyte imbalance can result in confusion, seizures, or coma?

• Hypermagnesemia
• Hyperkalemia
• Hypocalcemia
• Hyponatremia (Correct answer)

Correct answer: Hyponatremia

Hyponatremia, or low sodium levels in the blood, can cause water to shift into brain cells, leading to cerebral edema. This swelling can manifest as severe neurological symptoms ranging from confusion and lethargy to seizures and coma. It is a serious electrolyte imbalance requiring careful and immediate management in dialysis patients.

Question 82: A patient develops muscle cramps during hemodialysis. What is the most appropriate initial intervention?

• Reduce ultrafiltration rate and administer a small normal saline bolus (Correct answer)
• Apply heat packs to the affected muscles
• Increase blood pump speed
• Discontinue treatment immediately

Correct answer: Reduce ultrafiltration rate and administer a small normal saline bolus

Muscle cramps during dialysis are usually caused by excessive fluid removal or low plasma osmolality; reducing the UF rate and giving a small saline bolus corrects fluid shifts.

Question 83: Which is the most common cause of chronic kidney failure in the US?

• Hypertension
• Polycystic kidney smaller molecular disease
• Glomerulonephritis
• Diabetes (Correct answer)

Correct answer: Diabetes

Diabetes is the leading cause of chronic kidney disease (CKD) and end-stage renal disease (ESRD) in the United States. High blood sugar levels over time damage the small blood vessels in the kidneys, impairing their ability to filter waste from the blood. Managing diabetes effectively is crucial for preventing or slowing the progression of kidney failure.

Question 84: What is the purpose of using a tourniquet when preparing to cannulate an AV fistula?

• To reduce the patient's pain during needle insertion by creating distal ischemia
• To test whether the fistula is patent by checking if the thrill returns after tourniquet release
• To stop all blood flow to allow safer needle insertion without bleeding risk
• To increase blood pressure in the fistula, making it easier to visualize and palpate the vessel before needle insertion (Correct answer)

Correct answer: To increase blood pressure in the fistula, making it easier to visualize and palpate the vessel before needle insertion

A tourniquet applied proximal to the fistula temporarily increases venous pressure and distends the vessel, making it easier to visualize, palpate, and cannulate—particularly in patients with deep or small fistulas. The tourniquet is removed after successful needle insertion.

Question 85: What is the role of the ESRD Network Organization in dialysis quality oversight?

• They process Medicare claims and approve treatment orders
• They provide quality improvement assistance and patient grievance services under a CMS contract (Correct answer)
• They perform annual licensing inspections of all dialysis facilities
• They directly employ dialysis technicians and set their wages

Correct answer: They provide quality improvement assistance and patient grievance services under a CMS contract

ESRD Network Organizations are nonprofit organizations under contract with CMS that provide quality improvement support to dialysis facilities and serve as a patient grievance resource. They collect outcome data, assist facilities with quality improvement projects, and can investigate patient complaints.

Question 86: What is the maximum allowable bacterial count in dialysis water per AAMI standards?

• 200 CFU/mL (action level 50 CFU/mL) (Correct answer)
• 10 CFU/mL (no action level)
• 1,000 CFU/mL (action level 500 CFU/mL)
• 100 CFU/mL (action level 10 CFU/mL)

Correct answer: 200 CFU/mL (action level 50 CFU/mL)

AAMI standards require dialysis water to have less than 200 CFU/mL of bacteria, with an action level of 50 CFU/mL. Exceeding the action level requires investigation and corrective action before results reach the maximum allowable limit.

Question 87: What is the appropriate gauge needle to use for hemodialysis cannulation in standard adult patients?

• 18-gauge (largest diameter)
• Gauge does not matter as long as blood flow is adequate
• 15 to 17 gauge needles are standard for most adult hemodialysis patients (Correct answer)
• 20 to 22 gauge needles to minimize vessel trauma

Correct answer: 15 to 17 gauge needles are standard for most adult hemodialysis patients

15 to 17 gauge needles are the standard size for hemodialysis, large enough to achieve prescribed blood flow rates (300 to 500 mL/min) without excessive negative pressure.

Question 88: Which of the following best describes the purpose of pressure testing a dialyzer during reprocessing?

• To measure ultrafiltration rate
• To confirm the dialysate flow path is patent
• To verify membrane integrity and detect fiber bundle leaks (Correct answer)
• To check the blood pump segment for cracks

Correct answer: To verify membrane integrity and detect fiber bundle leaks

Pressure testing during reprocessing verifies the integrity of the dialyzer membrane. A drop in pressure indicates that fibers are broken or leaking, which would allow blood and dialysate to mix during treatment—a serious patient safety risk.

Question 89: What is the significance of the transmembrane pressure (TMP) reading on a hemodialysis machine?

• It measures resistance in the arterial blood line
• It measures the patient's blood pressure during treatment
• It indicates the pressure driving fluid across the dialyzer membrane for ultrafiltration (Correct answer)
• It monitors the speed of the dialysate pump

Correct answer: It indicates the pressure driving fluid across the dialyzer membrane for ultrafiltration

TMP is the pressure difference across the dialyzer membrane that drives ultrafiltration (fluid removal) from the blood side to the dialysate side.

Question 90: What is the role of the reverse osmosis (RO) unit in the dialysis water treatment system?

• To sterilize the water by ultraviolet irradiation before distribution to dialysis machines
• To remove the majority of dissolved solutes, bacteria, and endotoxins from the pretreated water (Correct answer)
• To neutralize chloramines that were not removed by the activated carbon tanks
• To add necessary minerals and electrolytes to the purified water for dialysate preparation

Correct answer: To remove the majority of dissolved solutes, bacteria, and endotoxins from the pretreated water

The reverse osmosis unit is the primary purification step, removing 90–99% of dissolved solutes (including toxic metals, bacteria, viruses, and endotoxins) through membrane filtration under high pressure. It produces the ultrapure water required for dialysate preparation.

Question 91: What is the purpose of testing dialysis water for endotoxins?

• To measure the total dissolved solids that might interfere with dialysate mixing
• To detect bacterial cell wall fragments that can cause inflammatory reactions even in the absence of live bacteria (Correct answer)
• To confirm the water is free of aluminum and heavy metals
• To assess the effectiveness of chloramine removal by the carbon tanks

Correct answer: To detect bacterial cell wall fragments that can cause inflammatory reactions even in the absence of live bacteria

Endotoxins are lipopolysaccharides derived from gram-negative bacterial cell walls. Even dead bacteria release endotoxins. When endotoxins enter the bloodstream via the dialysate, they trigger immune responses causing fever, hypotension, and systemic inflammation—even without live bacterial infection.

Question 92: The hemodialysis machine continuously monitors many parameters. Which of these parameters must be verified by an external measuring device?

• pH and conductivity (Correct answer)
• Dialysate flow
• Temperature and transmembrane pressure
• Blood flow

Correct answer: pH and conductivity

While hemodialysis machines monitor many parameters, pH and conductivity are critical for patient safety and must be independently verified by an external measuring device. This external check ensures the accuracy of the machine's internal sensors, confirming that the dialysate composition is within safe and prescribed limits to prevent patient harm.

Question 93: A patient has a right internal jugular central venous catheter for hemodialysis, but a pressure alarm sounds during treatment indicating that the blood flow rate is lower than prescribed. On checking, the technician finds that the lines appear clear and there are no signs of kinking, bleeding, or air entering the system. The next intervention should be to __________.

• reverse the arterial and venous lines
• lower the patient's head and ask the patient to cough (Correct answer)
• flush the central venous catheter with normal saline
• stop dialysis

Correct answer: lower the patient's head and ask the patient to cough

If a central venous catheter (CVC) has a pressure alarm indicating low blood flow without visible issues, the problem might be catheter malposition or a small clot at the tip. Lowering the patient's head and asking them to cough can sometimes reposition the catheter tip or dislodge a minor obstruction, thereby improving blood flow. This is a common initial intervention before more invasive measures.

Question 94: A patient on a reuse program develops fever and rigors during dialysis using a reprocessed dialyzer. What is the most likely cause related to the reprocessing process?

• Pyrogenic reaction from bacterial endotoxins in the dialyzer (Correct answer)
• Air embolism from improper priming of the dialyzer
• Inadequate ultrafiltration from reduced TCV
• Hemolysis from excess anticoagulation

Correct answer: Pyrogenic reaction from bacterial endotoxins in the dialyzer

Fever and rigors during dialysis with a reprocessed dialyzer suggest a pyrogenic reaction caused by bacterial endotoxins (lipopolysaccharides) contaminating the dialyzer. This can occur if reprocessing water quality was substandard or if biofilm developed in the dialyzer.

Question 95: According to AAMI standards, a reprocessed dialyzer must be discarded if its fiber bundle volume (FBV) drops below what percentage of its original measured volume?

• 75%
• 90%
• 70%
• 80% (Correct answer)

Correct answer: 80%

The Association for the Advancement of Medical Instrumentation (AAMI) sets the standard that a reprocessed dialyzer must retain at least 80% of its original TCV/FBV. If the volume drops below this threshold, the dialyzer has lost too much surface area to provide an adequate treatment and must be discarded.

Question 96: A dialysis patient develops aluminum toxicity. Which water treatment failure is the most likely cause?

• Failure of the water softener to remove calcium
• Inadequate removal of aluminum from the source water by the RO system (Correct answer)
• Chloramine breakthrough from an exhausted carbon filter
• Failure of the ultraviolet light sterilization unit

Correct answer: Inadequate removal of aluminum from the source water by the RO system

Aluminum toxicity in dialysis patients is primarily caused by inadequate removal of aluminum from source water, which then enters the patient's bloodstream via the dialysate. The RO system must effectively remove aluminum; failure of the RO or elevated source water aluminum can cause toxic accumulation.

Question 97: A patient experiences a seizure during treatment. After calling for help and ensuring the patient is safe from injury, what is the next immediate step related to the treatment?

• Disconnect the patient from the machine immediately
• Place a tongue depressor in the patient's mouth
• Increase the blood flow rate to improve brain perfusion
• Stop ultrafiltration and reduce the blood flow rate (Correct answer)

Correct answer: Stop ultrafiltration and reduce the blood flow rate

The immediate action related to the dialysis treatment is to reduce physiological stress on the patient. Stopping ultrafiltration and lowering the blood flow rate can help stabilize the patient, as seizures can sometimes be triggered by hypotension or disequilibrium syndrome.

Question 98: When using active listening, which of the following is a good example of a short, open-ended question to use to encourage patient communication?

• "Has the pain gotten worse?"
• "What does the pain in your abdomen feel like?"
• "Do you have pain?"
• "How would you rate your pain on a 1 to 10 scale?"

An open-ended question encourages the patient to provide more than a simple 'yes' or 'no' answer, fostering detailed communication. 'What does the pain in your abdomen feel like?' prompts the patient to describe the quality, intensity, and other characteristics of their pain, allowing the technician to gather comprehensive information and better understand their experience. This approach is crucial for active listening as it invites deeper engagement and provides valuable insights into the patient's condition.

Question 99: According to the 'Rule of 6s,' which set of criteria indicates that an AV fistula is mature and ready for cannulation?

• Flow >800 mL/min, diameter ≥8 mm, depth ≤4 mm, maturation ≥8 weeks
• Flow >600 mL/min, diameter ≥6 mm, depth ≤6 mm, maturation ≥6 weeks (Correct answer)
• Flow >400 mL/min, diameter ≥4 mm, depth ≤8 mm, maturation ≥4 weeks
• Flow >500 mL/min, diameter ≥5 mm, depth ≤5 mm, maturation ≥5 weeks

Correct answer: Flow >600 mL/min, diameter ≥6 mm, depth ≤6 mm, maturation ≥6 weeks

The Rule of 6s states a fistula is mature when it has blood flow exceeding 600 mL/min, a vessel diameter of at least 6 mm, is no more than 6 mm below the skin surface, and has had at least 6 weeks to mature. These thresholds help ensure reliable cannulation and adequate dialysis delivery.

Question 100: How frequently should blood pressure be monitored during a standard hemodialysis treatment?

• Once at the start of treatment and once at the end
• Only when the patient requests it or the blood pressure alarm triggers
• Every 30 minutes (minimum) throughout treatment, with more frequent monitoring if unstable (Correct answer)
• Every 2 hours or when the patient complains of symptoms

Correct answer: Every 30 minutes (minimum) throughout treatment, with more frequent monitoring if unstable

CMS Conditions for Coverage and standard clinical practice require blood pressure monitoring at a minimum every 30 minutes during hemodialysis, with more frequent monitoring during unstable periods or when hemodynamically sensitive interventions are made.

Question 101: What is the purpose of maintaining a log of dialysis machine disinfection in the hemodialysis unit?

• To calculate the cost of disinfectant use
• To track machine age and schedule replacements
• To document compliance with infection control protocols and provide traceability for outbreak investigations (Correct answer)
• To schedule machine calibration appointments

Correct answer: To document compliance with infection control protocols and provide traceability for outbreak investigations

Disinfection logs provide regulatory compliance documentation and enable traceback during infection outbreaks to identify potential sources.

Question 102: What action should a technician take if the air detector alarm activates during hemodialysis?

• Remove the patient from the circuit gently
• Increase the blood pump speed
• Silence the alarm and continue treatment
• Clamp the venous line and stop the blood pump immediately (Correct answer)

Correct answer: Clamp the venous line and stop the blood pump immediately

An air detector alarm requires immediate clamping of the venous blood line and stopping the blood pump to prevent air embolism.

Question 103: Which medication is used to reverse the anticoagulant effects of heparin in cases of overdose or emergency bleeding?

• Protamine sulfate (Correct answer)
• Tranexamic acid
• Fresh frozen plasma
• Vitamin K

Correct answer: Protamine sulfate

Protamine sulfate binds and neutralizes heparin, rapidly reversing its anticoagulant effect.

Question 104: In a non-urgent clinical situation, how long should a technician typically wait before cannulating a newly placed synthetic AV graft?

• 2–4 weeks (Correct answer)
• 24–48 hours
• 3–5 days
• 3–6 months

Correct answer: 2–4 weeks

Standard synthetic AV grafts require approximately 2–4 weeks of healing time to allow the graft material to incorporate into surrounding tissue and edema to resolve, reducing the risk of infiltration and hematoma on first cannulation. Early cannulation grafts are a separate product designed for use within 24–72 hours.

Question 105: Patients receiving hemodialysis are at risk for amyloidosis. Which of the following symptoms may indicate amyloidosis?

• Hypertension
• Anemia
• Joint pain (Correct answer)
• Bleeding

Correct answer: Joint pain

Dialysis-related amyloidosis (DRA) is a condition where beta-2 microglobulin, a protein not adequately cleared by dialysis, accumulates in tissues. This accumulation often manifests as joint pain, particularly in the shoulders, wrists, and hands, and can also lead to carpal tunnel syndrome. Recognizing these musculoskeletal symptoms is important for identifying DRA in hemodialysis patients.

Question 106: What is the steal phenomenon in the context of vascular access, and which patient population is at highest risk?

• Access blood flow stealing from cardiac output causing hypotension
• Blood stealing from the circuit due to high blood pump speeds
• Diversion of arterial blood flow away from the distal extremity by the low-resistance access, causing ischemia; highest risk in diabetics and elderly with peripheral vascular disease (Correct answer)
• A complication only seen with central venous catheters

Correct answer: Diversion of arterial blood flow away from the distal extremity by the low-resistance access, causing ischemia; highest risk in diabetics and elderly with peripheral vascular disease

Steal syndrome occurs when the low-resistance AV access preferentially carries blood flow away from the hand/fingers; diabetics and those with peripheral vascular disease are at highest risk due to pre-existing distal ischemia.

Question 107: What nutritional parameter is most important to monitor in hemodialysis patients to prevent protein-energy wasting (PEW)?

• Total caloric intake only
• Fat-soluble vitamin levels
• Carbohydrate intake
• Normalized protein catabolic rate (nPCR) and serum albumin (Correct answer)

Correct answer: Normalized protein catabolic rate (nPCR) and serum albumin

nPCR reflects protein intake adequacy and, combined with albumin as a visceral protein marker, provides the best assessment of protein-energy status in dialysis patients.

Question 108: How long can a reprocessed dialyzer typically be stored before it must be used or discarded?

• 24 hours
• 14 days
• 3 days
• 7 days (Correct answer)

Correct answer: 7 days

Most reprocessed dialyzers filled with germicide have a storage life of 7 days. After this period, the germicide may have degraded below effective concentrations, potentially allowing microbial growth inside the dialyzer.

Question 109: What is the purpose of the dialyzer in a hemodialysis machine?

• Filters waste and excess fluid from the blood (Correct answer)
• Regulates patient blood pressure
• Delivers medications
• Controls body temperature

Correct answer: Filters waste and excess fluid from the blood

The dialyzer, often referred to as the 'artificial kidney,' is the central component of the hemodialysis machine. It contains a semi-permeable membrane that filters waste products like urea, creatinine, and excess electrolytes, along with excess fluid, from the patient's blood into the dialysate solution. This process effectively mimics the filtering function of healthy kidneys, purifying the blood.

Question 110: A patient asks why they cannot use lotion on their access site on the day of treatment. What is the best explanation?

• Lotions can interfere with proper site cleaning and increase infection risk (Correct answer)
• It can make the skin too slippery for the needles
• It can cause a severe allergic reaction with the dialyzer
• It will cause the access to clot

Correct answer: Lotions can interfere with proper site cleaning and increase infection risk

Proper disinfection of the cannulation sites is critical to prevent access-related infections. Lotions and creams can create a barrier that prevents the antiseptic from effectively killing bacteria on the skin, and they can also be introduced into the bloodstream during cannulation.

Question 111: Salt replacements should not be used by hemodialysis patients because they frequently ____________.

• taste bad.
• cause constipation.
• cause nausea.
• contain potassium. (Correct answer)

Correct answer: contain potassium.

Since high potassium intake is risky, patients getting hemodialysis should be counseled to stay away from salt substitutes, which frequently exchange potassium for some of the sodium. When a replacement is advertised as "sodium free," it is typically entirely made of potassium. Patients can be urged to experiment with using various herbs or lemon juice in place of salt. While Mrs. Dash® products lack sodium or potassium, they do contain mixtures of other herbs and spices.

Question 112: When using a continuous heparin infusion during dialysis, what laboratory test is used to monitor anticoagulation levels?

• Platelet count
• Activated clotting time (ACT) or APTT (Correct answer)
• Prothrombin time (PT)
• Serum creatinine

Correct answer: Activated clotting time (ACT) or APTT

The activated clotting time (ACT) or activated partial thromboplastin time (APTT) is used to monitor heparin anticoagulation during dialysis.

Question 113: Infections in buttonhole tracts are almost always caused by ___________.

• contaminated hands
• poor skin preparation
• incorrect cannulation technique
• improper scab removal (Correct answer)

Correct answer: improper scab removal

Infections in buttonhole tracts are most commonly caused by improper or incomplete scab removal before cannulation. If scabs are not thoroughly removed, they can be pushed into the tract during needle insertion, introducing bacteria directly into the bloodstream. Proper cleaning and meticulous scab removal are critical steps to prevent these infections and ensure patient safety.

Question 114: The primary purpose of the Health Insurance Portability and Accountability Act (HIPAA) is to:

• Ensure proper billing and coding for Medicare.
• Set standards for workplace safety.
• Regulate the quality of dialysis care.
• Protect the privacy and security of patient health information. (Correct answer)

Correct answer: Protect the privacy and security of patient health information.

HIPAA's Privacy Rule establishes national standards to protect individuals' medical records and other personal health information (PHI). It sets limits and conditions on the uses and disclosures of such information.

Question 115: What is the proper technique for disinfecting the skin before needle insertion for arteriovenous fistula cannulation?

• No disinfection needed if the patient recently showered
• Wipe with a single alcohol swab in one direction
• Use povidone-iodine spray without rubbing
• Apply chlorhexidine gluconate in a circular motion and allow to dry completely before needling (Correct answer)

Correct answer: Apply chlorhexidine gluconate in a circular motion and allow to dry completely before needling

Chlorhexidine gluconate applied with friction and allowed to air dry provides the most effective skin antisepsis before cannulation, reducing infection risk.

Question 116: When inserting the arterial needle into an AV fistula for hemodialysis, in which direction should the needle bevel face and why?

• Needle direction does not affect blood flow and is based on technician preference
• Bevel toward the arterial anastomosis to align with the direction of blood flow
• Bevel down (facing the vessel wall) to prevent the bevel from sucking against the vessel wall
• Bevel up (facing away from the vessel wall) to facilitate entry into the lumen and optimal blood inflow (Correct answer)

Correct answer: Bevel up (facing away from the vessel wall) to facilitate entry into the lumen and optimal blood inflow

The needle bevel should face upward (away from the vessel wall) during insertion to facilitate smooth entry into the vessel lumen, reduce vessel wall trauma during insertion, and prevent the needle bevel from creating a flap valve against the vessel wall that would obstruct blood inflow.

Question 117: When teaching a patient about fluid restrictions, which item should be counted as part of their daily fluid allowance?

• Hard candy
• Rice cakes
• Dry crackers
• Gelatin/Jello (Correct answer)

Correct answer: Gelatin/Jello

Gelatin (Jello) is a liquid at room temperature and must be counted in the daily fluid allowance for dialysis patients.

Question 118: Proper labeling of a reprocessed dialyzer is crucial for patient safety. Which of the following pieces of information is required on the label?

• The brand of the reprocessing machine used
• The number of previous uses (Correct answer)
• The name of the technician who performed the reprocessing
• The patient's date of birth

Correct answer: The number of previous uses

The label on a reprocessed dialyzer must contain critical patient safety information to ensure it is used on the correct patient and is still safe for use. This includes the patient's name, the number of times it has been used, and the date of reprocessing.

Question 119: What is the correct angle at which to cannulate a fistula?

• 25-35 degrees (Correct answer)
• 35-45 degrees
• It doesn't matter
• 10-15 degrees

Correct answer: 25-35 degrees

Cannulating a fistula at an angle of 25-35 degrees is recommended to ensure proper needle placement within the vessel lumen without puncturing the back wall. This angle allows for smooth entry and minimizes trauma to the vessel, which is crucial for preserving the long-term patency and function of the fistula. Incorrect angles can lead to complications such as hematoma, infiltration, or damage to the access.

Question 120: During hemodialysis, a patient suddenly becomes confused and short of breath, and the technician observes foam or bubbles in the venous blood line. Which complication should be suspected?

• Hemolysis
• Air embolism (Correct answer)
• Hypertensive urgency
• Hypoglycemia

Correct answer: Air embolism

Visible air or foam in the venous blood line combined with acute neurological changes and respiratory distress are classic signs of air embolism, a life-threatening emergency requiring immediate clamp of the venous line and positional management.

Question 121: A conductivity alarm sounds during a hemodialysis treatment. The technician should expect which of these events to have occurred:

• The blood pump has stopped
• The electrical power source was interrupted
• The dialyzer was bypassed (Correct answer)
• The dialysate flow rate has increased

Correct answer: The dialyzer was bypassed

A conductivity alarm indicates that the dialysate's electrolyte concentration is outside the safe range, which could harm the patient. When this alarm sounds, the hemodialysis machine is designed to automatically bypass the dialyzer, preventing the unsafe dialysate from reaching the patient's blood. This safety mechanism ensures that treatment is temporarily halted until the conductivity issue is resolved.

Question 122: Which component of the dialysis machine is responsible for controlling the flow of blood through the dialyzer?

• Blood pump (Correct answer)
• Dialysate pump
• Ultrafiltration pump
• Air detector

Correct answer: Blood pump

The blood pump is the component of the dialysis machine responsible for drawing the patient's blood from their vascular access and propelling it through the extracorporeal circuit, including the dialyzer. It ensures a consistent and controlled flow rate, which is essential for efficient waste removal and fluid management during the dialysis treatment. Without the blood pump, blood would not circulate through the system.

Question 123: How should a CCHT handle a situation where they are asked to perform a task outside their scope of practice?

• Politely decline and notify the charge nurse that the task requires someone with appropriate credentials (Correct answer)
• Perform the task if no one else is available
• Perform the task to help the overworked nurse
• Complete the task and document it as if the nurse performed it

Correct answer: Politely decline and notify the charge nurse that the task requires someone with appropriate credentials

CCHTs must practice within their defined scope; performing tasks outside their scope regardless of pressure creates patient safety risks and professional liability.

Question 124: Which of the following best describes the reason for wearing gloves when handling a machine prior to blood?

• HIV
• Universal precautions (Correct answer)
• Asepsis
• Patient comfort

Correct answer: Universal precautions

Universal precautions are an infection control strategy that treats all human blood and certain body fluids as if they are known to be infectious for HIV, HBV, and other bloodborne pathogens. Wearing gloves when handling equipment, even before blood is present, adheres to this principle by protecting the technician from potential exposure to unseen contaminants or residual bodily fluids from previous use. This proactive measure minimizes the risk of pathogen transmission in a healthcare setting.

Question 125: What is the 'buttonhole' (constant site) cannulation technique, and what is its primary advantage?

• A special technique for cannulating a new fistula that has not yet matured
• Cannulating the arteriovenous fistula at multiple rotating sites to prevent scarring and aneurysm formation
• Cannulating the fistula at the exact same sites each treatment to create a fibrous tunnel, allowing blunt needle entry and reducing pain and infiltration risk (Correct answer)
• A technique used exclusively for patients with needle phobia involving a numbing cream applied before cannulation

Correct answer: Cannulating the fistula at the exact same sites each treatment to create a fibrous tunnel, allowing blunt needle entry and reducing pain and infiltration risk

The buttonhole technique involves inserting needles at the exact same angle, depth, and direction every treatment until a fibrous 'buttonhole' tunnel forms in the tissue. Once established, blunt needles can be inserted through the tunnel without penetrating new tissue, reducing pain and potentially decreasing infiltration and aneurysm risk.

Question 126: According to AAMI standards, what is the maximum allowable endotoxin level in water used for standard hemodialysis?

• 2 EU/mL (Correct answer)
• 10 EU/mL
• 0.25 EU/mL
• 0.03 EU/mL

Correct answer: 2 EU/mL

AAMI standards set the maximum endotoxin level at 2 EU/mL for standard dialysis water, with an action level of 1 EU/mL. Exceeding these limits puts patients at risk for pyrogenic (fever-producing) reactions during treatment.

Question 127: What assessment finding during hemodialysis most strongly suggests that a patient's AVG has developed significant stenosis at the venous anastomosis?

• Lower than usual arterial pressures
• Lower ultrafiltration rates
• Decreased blood pump speed alarm frequency
• Progressively increasing venous pressures over multiple treatments with reduced blood flow rates (Correct answer)

Correct answer: Progressively increasing venous pressures over multiple treatments with reduced blood flow rates

Rising venous pressures over time indicate increasing outflow resistance, most commonly from stenosis at or near the venous anastomosis of an AVG.

Question 128: Why is dietary phosphorus restriction challenging for hemodialysis patients who require adequate protein intake?

• Protein supplements for dialysis patients contain high phosphorus levels that cannot be avoided
• High-protein foods are uniformly low in phosphorus, so restricting protein resolves both issues simultaneously
• The phosphorus restriction only applies to plant-based protein sources
• Phosphorus and protein are co-located in many foods, so restricting phosphorus often reduces protein intake below recommended levels (Correct answer)

Correct answer: Phosphorus and protein are co-located in many foods, so restricting phosphorus often reduces protein intake below recommended levels

Protein-rich foods (meat, dairy, eggs, legumes) are also naturally high in phosphorus. Restricting dietary phosphorus often leads to reduced protein intake, creating a tension between two essential dietary goals: adequate protein (≥1.0 g/kg/day) and phosphorus restriction (<800–1000 mg/day).

Question 129: Which of the following are ways to handle chemicals safely?

• Don't eat or drink in the work area
• Wear protective clothing
• Wash hands before eating or drinking
• All of the above (Correct answer)

Correct answer: All of the above

Safe chemical handling involves multiple practices to protect staff and patients. Washing hands before eating or drinking prevents ingestion of chemical residues, wearing protective clothing (like gloves and gowns) creates a barrier against skin exposure, and refraining from eating or drinking in work areas minimizes the risk of accidental ingestion or contamination. Adhering to all these guidelines is crucial for maintaining a safe environment when working with chemicals.

Question 130: Which observation during hemodialysis treatment should prompt a CCHT to contact the overseeing nurse?

• Patient develops new onset confusion or altered mental status during treatment (Correct answer)
• Patient is reading a book during treatment
• The patient requests a blanket for warmth
• Blood pump speed is running at the prescribed rate

Correct answer: Patient develops new onset confusion or altered mental status during treatment

New onset confusion or altered mental status during dialysis may indicate dialysis disequilibrium, severe hypotension, hypo/hyperglycemia, or other serious conditions requiring immediate nursing assessment.

Question 131: What is the first step before initiating hemodialysis treatment?

• Start the blood pump
• Verify patient and prescription (Correct answer)
• Check dialyzer settings
• Flush the catheter

Correct answer: Verify patient and prescription

Patient safety is paramount in healthcare. The very first step before initiating any medical treatment, including hemodialysis, is to perform a 'time-out' to verify the correct patient and ensure the treatment prescription matches the patient's identity and current orders. This critical step prevents errors and ensures the right treatment is given to the right person.

Question 132: What type of water quality testing documents are required to be maintained in the dialysis facility?

• Water test results are maintained only by the water treatment vendor and not required on-site
• Only monthly bacteriology reports are required by CMS
• Daily chlorine/chloramine logs, monthly bacteriology and endotoxin results, and annual chemical analysis, retained for at least 2 years (Correct answer)
• Only the annual state inspection water quality report is required

Correct answer: Daily chlorine/chloramine logs, monthly bacteriology and endotoxin results, and annual chemical analysis, retained for at least 2 years

Facilities must maintain comprehensive water quality records including daily chlorine/chloramine logs, monthly microbiological results (bacteria and endotoxins), and annual chemical analysis for all AAMI-required contaminants. CMS Conditions for Coverage require these records to be retained and available for surveyor review.

Question 133: A technician notices the reuse count on a dialyzer has reached the facility's maximum allowed reuses. What is the correct action?

• Continue using the dialyzer if TCV is still within acceptable limits
• Report to the nephrologist before discarding
• Reprocess the dialyzer one additional time with double germicide concentration
• Discard the dialyzer and document the disposal (Correct answer)

Correct answer: Discard the dialyzer and document the disposal

When a dialyzer reaches the facility's maximum reuse count, it must be discarded regardless of TCV or visual appearance. The reuse limit is a safety boundary set by the facility based on manufacturer data, regulatory standards, and clinical policy.

Question 134: What is a pseudoaneurysm (false aneurysm) of an arteriovenous fistula, and how does it differ from a true aneurysm?

• They are clinically identical and managed the same way
• Pseudoaneurysms only occur in arteriovenous grafts
• Pseudoaneurysm involves all three vessel wall layers; true aneurysm is contained by fibrous tissue only
• Pseudoaneurysm is a pulsatile hematoma outside the vessel wall contained by fibrous tissue; true aneurysm involves all wall layers (Correct answer)

Correct answer: Pseudoaneurysm is a pulsatile hematoma outside the vessel wall contained by fibrous tissue; true aneurysm involves all wall layers

A pseudoaneurysm results from a vessel wall defect with blood escaping into tissue and being contained by a fibrous capsule, not the actual vessel wall layers.

Question 135: What action should be taken if a hemodialysis staff member receives a needlestick injury from a used dialysis needle?

• Complete the treatment first, then report the injury at the end of the shift
• No action needed if the source patient is known to be HIV negative
• Apply antibiotic ointment and continue working without reporting if vaccinated against hepatitis B
• Immediately wash the wound, report to supervisor, complete an incident report, and seek post-exposure evaluation (Correct answer)

Correct answer: Immediately wash the wound, report to supervisor, complete an incident report, and seek post-exposure evaluation

Needlestick injuries require immediate wound care, incident reporting, and medical evaluation for post-exposure prophylaxis (PEP) potential regardless of known source patient status.

Question 136: What does a Kt/V value of 1.2 indicate about a hemodialysis patient's treatment adequacy?

• The patient is receiving inadequate dialysis and the treatment time or blood flow rate should be increased
• The Kt/V value is unrelated to treatment adequacy in hemodialysis
• The patient is being over-dialyzed and the treatment time should be reduced
• The patient is receiving the minimum adequate dose of dialysis per current guidelines (Correct answer)

Correct answer: The patient is receiving the minimum adequate dose of dialysis per current guidelines

Kt/V of 1.2 meets the minimum KDOQI recommended target for thrice-weekly hemodialysis (minimum 1.2, target ≥1.4). It indicates the patient is receiving an adequate dose of dialysis, though higher values provide additional benefit.

Question 137: What is the best response if a patient becomes unresponsive during dialysis?

• Adjust dialysate
• Administer glucose
• Check responsiveness and call for help (Correct answer)
• Lower BFR

Correct answer: Check responsiveness and call for help

If a patient becomes unresponsive during dialysis, the best response is to immediately check responsiveness and call for help. An unresponsive patient is a medical emergency requiring rapid assessment of airway, breathing, and circulation (ABCs) and activation of emergency protocols. Prompt action is crucial to identify the cause and initiate life-saving interventions.

Question 138: Which of the following is an important step before starting dialysis?

• Check for leaks
• Verify patient weight
• Ensure air detectors are functioning
• All of the above (Correct answer)

Correct answer: All of the above

Before starting dialysis, it is crucial to perform a comprehensive safety check to ensure patient safety and effective treatment. Verifying the patient's weight is essential for accurate ultrafiltration goals, checking for leaks in the circuit prevents blood loss and contamination, and ensuring air detectors are functioning properly prevents life-threatening air embolisms. All these steps are vital for a safe and successful dialysis session.

Question 139: A patient on erythropoiesis-stimulating agents (ESAs) has a hemoglobin of 13.5 g/dL during a routine check. What is the concern and appropriate action?

• Hemoglobin of 13.5 is critical; transfuse immediately
• This level is ideal; continue current treatment
• Hemoglobin is above target; notify physician as ESA dose may need reduction to avoid thrombotic events (Correct answer)
• Hemoglobin is too low; increase ESA dose immediately

Correct answer: Hemoglobin is above target; notify physician as ESA dose may need reduction to avoid thrombotic events

Hemoglobin above 13 g/dL in dialysis patients on ESAs is associated with increased risk of stroke, MI, and thrombosis; dose reduction or ESA hold is required.

Question 140: Which of the following non-prescription remedies might help treat symptoms if a patient complains of chronic itching?

• Avoid bathing.
• Take cold showers.
• Apply rubbing alcohol.
• Take oatmeal baths. (Correct answer)

Correct answer: Take oatmeal baths.

Taking oatmeal baths can help to calm the skin and alleviate itching if a patient complains of recurrent itching. Maintaining healthy skin moisture (with products like Aveeno® or Cetaphil®) may also be beneficial. For the majority of kidney dialysis users, itching is a concern. Patients who are itching should always be evaluated by the nurse. Hyperparathyroidism may cause itching, thus treating it may assist with symptoms. Phosphate binders could be helpful if the patient has too much phosphorus in their system.

Question 141: What percentage of the water that is filtered out of the blood by the glomeruli is excreted as urine?

• 0.50%
• 10%
• 99%
• 1% (Correct answer)

Correct answer: 1%

The kidneys filter a vast amount of water from the blood each day, but the body reabsorbs most of it to maintain fluid balance. Only about 1% of the water initially filtered by the glomeruli is ultimately excreted as urine. This efficient reabsorption mechanism is crucial for conserving essential body fluids and preventing dehydration.

Question 142: What is the function of the distribution loop in the dialysis water treatment system?

• To continuously circulate RO-purified water to dialysis machines, preventing stagnation and bacterial growth in supply lines (Correct answer)
• To distribute backwash water from the RO reject stream to the floor drains
• To recirculate used dialysate back through the RO system for reuse
• To distribute concentrated electrolytes from the proportioning system to individual dialysis machines

Correct answer: To continuously circulate RO-purified water to dialysis machines, preventing stagnation and bacterial growth in supply lines

The distribution loop continuously circulates RO product water through the supply lines to all dialysis machines. Continuous circulation prevents water from becoming stagnant in the lines, which would allow bacterial biofilm to form and multiply in the piping system.

Question 143: According to AAMI RD52, what is the maximum allowable level of bacteria in dialysate?

• 1,000 CFU's
• 500 CFU's
• 200 CFU's (Correct answer)
• 50 CFU's

Correct answer: 200 CFU's

According to the Association for the Advancement of Medical Instrumentation (AAMI) RD52 standards, the maximum allowable level of bacteria in dialysate is 200 Colony Forming Units (CFU's) per milliliter. Adhering to this standard is vital to minimize the risk of bacterial contamination and prevent infections or pyrogenic reactions in hemodialysis patients.

Question 144: What should you do if there is a blood leak detected during dialysis?

• Increase blood flow
• Switch to a new dialyzer
• Continue dialysis and monitor the patient
• Stop dialysis and check for leaks (Correct answer)

Correct answer: Stop dialysis and check for leaks

If a blood leak is detected during dialysis, it indicates a breach in the integrity of the extracorporeal circuit, which can lead to blood loss, contamination, or exposure to dialysate. The immediate and correct action is to stop dialysis to prevent further complications and thoroughly investigate the source of the leak. Continuing treatment or increasing blood flow would be dangerous and could exacerbate the problem.

Question 145: During a water quality check, the RO product water conductivity reading is 45 μS/cm, significantly higher than the baseline of 8 μS/cm. What does this most likely indicate?

• The carbon tank is exhausted and releasing chloramine into the RO feed
• The RO membrane is failing or bypassed, allowing solutes to pass through into the product water (Correct answer)
• Normal seasonal variation in source water mineral content
• The softener has been regenerated and is releasing excess sodium temporarily

Correct answer: The RO membrane is failing or bypassed, allowing solutes to pass through into the product water

A sudden increase in RO product water conductivity from 8 to 45 μS/cm (nearly 6-fold increase) indicates that the RO membrane is no longer effectively rejecting dissolved solutes. This is a significant quality failure requiring immediate investigation and potentially halting patient treatments until resolved.

Question 146: How often should activated carbon filters in the dialysis water treatment system be tested for chlorine/chloramine removal efficacy?

• Only when the reverse osmosis membrane is being serviced
• Before the first patient treatment of each day and after each shift (Correct answer)
• Weekly, or after any water utility maintenance in the area
• Monthly, with daily visual inspection of filter condition

Correct answer: Before the first patient treatment of each day and after each shift

AAMI standards require testing the effluent of the activated carbon filters for total chlorine and chloramines before the first patient treatment of the day and after each shift change, because carbon capacity can be exhausted at any time, and breakthrough is not visually detectable.

Question 147: At minimum, how frequently should dialysis water be tested for bacteriological contamination according to AAMI guidelines?

• Weekly
• Monthly (Correct answer)
• Quarterly
• Daily

Correct answer: Monthly

AAMI guidelines require bacteriological testing of dialysis water at least once per month. Monthly monitoring ensures that any microbial growth in the distribution loop or storage tank is detected before bacterial counts rise to levels that could cause patient infections or pyrogenic reactions.

Question 148: Which chemical is most commonly used as the sterilant/disinfectant in modern dialyzer reprocessing systems?

• Peracetic Acid (Correct answer)
• Glutaraldehyde
• Sodium Hypochlorite
• Formaldehyde

Correct answer: Peracetic Acid

Peracetic acid (PAA) is a widely used high-level disinfectant and sterilant in dialyzer reprocessing. It is effective against a broad spectrum of microorganisms, including bacteria, viruses, and spores, and it breaks down into non-toxic byproducts (acetic acid and oxygen).

Question 149: Three hours into a hemodialysis session, a patient develops painful bilateral leg cramps. Their blood pressure has decreased from 138/82 mmHg at treatment start to 108/66 mmHg. What should the technician do first?

• Administer IV calcium gluconate per standing order
• Increase the blood flow rate to speed treatment completion
• Terminate the treatment and transfer the patient to the emergency department
• Decrease the ultrafiltration rate and notify the nurse (Correct answer)

Correct answer: Decrease the ultrafiltration rate and notify the nurse

Muscle cramps accompanied by a significant blood pressure drop indicate the ultrafiltration rate is exceeding the patient's plasma refill capacity. Reducing the UF rate is the immediate first response, followed by notifying the nurse, who may also order a saline bolus.

Question 150: During dialysis, you observe bubbles in the venous blood line. What should you do immediately?

• Notify the biomedical technician to inspect the machine
• Clamp the venous line and stop the blood pump immediately (Correct answer)
• Slow the blood pump rate to allow bubbles to disperse
• Increase the saline flush rate to push bubbles through

Correct answer: Clamp the venous line and stop the blood pump immediately

Visible air bubbles in the venous blood line is a potential air embolism emergency. The venous line must be clamped and the blood pump stopped immediately to prevent air from entering the patient's circulation, which can be fatal.