CHT Patient Assessment and Monitoring in Dialysis 2 — Questions and Answers
Question 1: What does 'interdialytic weight gain' primarily reflect in a hemodialysis patient?
- Weight gained from increased skeletal muscle mass between treatments
- Improvement in the patient's nutritional status between sessions
- Fluid accumulated between dialysis sessions due to inability to excrete water (Correct answer)
- Change in the patient's bone density over the course of dialysis therapy
Correct answer: Fluid accumulated between dialysis sessions due to inability to excrete water
Interdialytic weight gain predominantly reflects fluid accumulation between sessions, since ESRD patients cannot excrete excess water through normal renal function.
Question 2: Which laboratory value serves as the primary indicator for assessing hemodialysis treatment adequacy?
- Urea reduction ratio (URR) or Kt/V urea (Correct answer)
- Serum potassium concentration
- Hemoglobin and hematocrit levels
- Serum phosphorus concentration
Correct answer: Urea reduction ratio (URR) or Kt/V urea
URR and Kt/V measure urea clearance, which serves as the standard surrogate for overall uremic toxin removal and dialysis adequacy.
Question 3: During hemodialysis, which clinical presentation is most characteristic of an air embolism?
- Hypertension, bradycardia, and facial flushing
- Elevated temperature, tachycardia, and rigors
- Muscle cramps, diaphoresis, and hypoglycemia
- Sudden hypotension, dyspnea, cyanosis, and a mill-wheel cardiac murmur (Correct answer)
Correct answer: Sudden hypotension, dyspnea, cyanosis, and a mill-wheel cardiac murmur
Air embolism classically presents with sudden hypotension, dyspnea, cyanosis, and a characteristic mill-wheel murmur caused by air churning in the cardiac chambers.
Question 4: What is the generally recommended maximum ultrafiltration rate to reduce the risk of intradialytic hypotension?
- Less than 5 mL/kg/hour
- Less than 13 mL/kg/hour (Correct answer)
- Greater than 20 mL/kg/hour
- Exactly 10 mL/kg/hour regardless of patient size
Correct answer: Less than 13 mL/kg/hour
Current evidence-based guidelines recommend keeping ultrafiltration rates below 13 mL/kg/hour to minimize cardiovascular stress and intradialytic hypotension risk.
Question 5: After completing hemodialysis, a patient's post-treatment weight should ideally match which reference value?
- The patient's weight recorded one month prior
- The average weight of demographically similar dialysis patients
- The patient's established dry weight (target weight) (Correct answer)
- The patient's body weight at the time dialysis therapy was first initiated
Correct answer: The patient's established dry weight (target weight)
Post-dialysis weight should equal the patient's established dry weight, confirming that appropriate fluid removal was achieved without over- or under-ultrafiltration.
Question 6: Which pre-dialysis physical assessment finding is most consistent with fluid overload in a hemodialysis patient?
- Bilateral pitting edema of the lower extremities and shortness of breath (Correct answer)
- Dry mucous membranes and decreased skin turgor
- Pre-dialysis weight that is below the patient's established dry weight
- Orthostatic hypotension upon transitioning from sitting to standing
Correct answer: Bilateral pitting edema of the lower extremities and shortness of breath
Bilateral pitting edema and dyspnea are hallmark signs of fluid overload, indicating excess fluid that hemodialysis must remove during the treatment session.
Question 7: A palpable thrill and audible bruit over an arteriovenous fistula indicate which of the following?
- Active infection at the cannulation site
- Venous stenosis that requires urgent referral for intervention
- Aneurysm formation at a frequently cannulated site
- Adequate blood flow through a functioning, patent fistula (Correct answer)
Correct answer: Adequate blood flow through a functioning, patent fistula
A palpable thrill (vibration) and audible bruit (rushing sound) are the normal expected findings of turbulent, high-velocity blood flow through a patent AV fistula.
CHT Patient Assessment and Monitoring in Dialysis 2
What does 'interdialytic weight gain' primarily reflect in a hemodialysis patient?