ABCP Perfusion Basic Science Examination (PBSE) — Certified Clinical Perfusionist — Questions and Answers

Question 1: What serious vascular complication is associated with femoral arterial VA-ECMO cannulation?

Systemic electrolyte imbalance
Limb ischemia distal to the arterial cannula (Correct answer)
Hypothermia in the cannulated limb
Chronic hypertension in the cannulated leg

Correct answer: Limb ischemia distal to the arterial cannula

The large arterial cannula can obstruct femoral artery flow, causing acute limb ischemia distal to the insertion site, requiring vigilant monitoring and often a distal perfusion cannula.

Question 2: What is the standard method to confirm correct venous cannula placement before initiating full bypass?

Venous pressure measurement alone
Serial blood gas analysis
Chest X-ray confirmation in the OR
Observing adequate venous drainage combined with TEE visualization of cannula position (Correct answer)

Correct answer: Observing adequate venous drainage combined with TEE visualization of cannula position

Transesophageal echocardiography directly visualizes cannula tip position while observation of adequate gravity or vacuum-assisted venous drainage confirms functional placement.

Question 3: The principle of non-maleficence in perfusion practice most directly obligates the perfusionist to:

Distribute perfusion resources equitably across patients
Avoid actions that cause unnecessary harm to the patient (Correct answer)
Respect the patient's autonomous decision-making
Maximize patient outcomes through aggressive interventions

Correct answer: Avoid actions that cause unnecessary harm to the patient

Non-maleficence, one of the four core bioethical principles, obligates healthcare providers to refrain from causing unnecessary harm to patients.

Question 4: What is the standard management when the perfusionist detects a sudden increase in arterial line pressure accompanied by facial edema on the right side of a patient during CPB?

Increase venous drainage by repositioning the venous cannula
Increase pump flow to overcome the obstruction
Suspect superior vena cava (SVC) cannula malposition and alert the surgeon (Correct answer)
Administer vasodilators to reduce arterial pressure

Correct answer: Suspect superior vena cava (SVC) cannula malposition and alert the surgeon

Unilateral facial edema with elevated venous pressure suggests SVC cannula malposition causing SVC obstruction, requiring immediate surgical correction.

Question 5: What is a ventricular assist device (VAD)?

A temporary transcutaneous pacemaker system
A mechanical pump that augments ventricular output by unloading the ventricle and maintaining systemic flow (Correct answer)
A device that completely replaces native heart function permanently
An oxygenator membrane used only in ECMO

Correct answer: A mechanical pump that augments ventricular output by unloading the ventricle and maintaining systemic flow

A VAD reduces ventricular wall stress by diverting blood from the ventricle through a pump to the aorta, supporting circulation while potentially allowing myocardial recovery.

Question 6: On a TEG (thromboelastography) tracing, the Maximum Amplitude (MA) primarily reflects:

Thrombin generation speed
Coagulation factor concentration
Platelet function and platelet-fibrin clot strength (Correct answer)
Fibrinolytic activity rate

Correct answer: Platelet function and platelet-fibrin clot strength

MA represents the maximum clot strength on TEG and is primarily determined by platelet function (~80%) and fibrin cross-linking (~20%), reflecting overall clot integrity.

Question 7: Cardioplegia delivery pressure for antegrade infusion into the aortic root should generally be maintained below which threshold to avoid coronary injury?

200 mmHg
150 mmHg
50 mmHg
100 mmHg (Correct answer)

Correct answer: 100 mmHg

Antegrade cardioplegia should be delivered at pressures below 100 mmHg (aortic root) to prevent coronary endothelial injury and ensure even distribution.

Question 8: "Heparin rebound" occurring hours after successful protamine reversal is caused by:

Release of tissue-sequestered heparin after protamine is metabolized (Correct answer)
Synthesis of new heparin by mast cells stimulated by surgery
Inadequate protamine dosing leaving residual circulating heparin
Auto-activation of factor Xa regenerating anticoagulant activity

Correct answer: Release of tissue-sequestered heparin after protamine is metabolized

Heparin rebound occurs when heparin sequestered in tissues or bound to plasma proteins is released into circulation after protamine has been eliminated, causing renewed anticoagulation.

Question 9: What is a perfusion emergency known as massive air embolism?

An allergic reaction to heparin
A drop in oxygen levels from the oxygenator
Introduction of a large volume of air into the patients arterial system through the bypass circuit (Correct answer)
A sudden increase in blood pressure

Correct answer: Introduction of a large volume of air into the patients arterial system through the bypass circuit

Massive air embolism is a catastrophic event where air enters the patients arterial system, potentially causing stroke, organ damage, or death.

Question 10: What vasopressor is commonly used to maintain blood pressure during bypass?

Warfarin
Digoxin
Aspirin
Phenylephrine (Correct answer)

Correct answer: Phenylephrine

Phenylephrine is an alpha-adrenergic agonist commonly used during bypass to increase systemic vascular resistance and maintain adequate mean arterial pressure.

Question 11: What surgical finding suggests adequate myocardial protection during cold cardioplegia delivery?

Sinus rhythm persisting throughout the arrest period
Pink, warm myocardium with active contractions
Pale, arrested, flaccid heart with surface temperature below 15°C (Correct answer)
Vigorous ventricular fibrillation

Correct answer: Pale, arrested, flaccid heart with surface temperature below 15°C

A pale, arrested, flaccid heart with low surface temperature indicates successful electrical arrest, metabolic suppression, and adequate cooling.

Question 12: Which complication results from advancing a two-stage venous cannula too deeply into the IVC?

Inadequate SVC drainage with superior vena cava hypertension and facial edema (Correct answer)
Pulmonary embolism
Ventricular fibrillation
Aortic regurgitation

Correct answer: Inadequate SVC drainage with superior vena cava hypertension and facial edema

Excessive IVC advancement positions the atrial drainage holes below the tricuspid valve, blocking right atrial drainage and causing SVC hypertension, facial plethora, and cerebral edema.

Question 13: During IABP therapy, balloon inflation should ideally be triggered by which cardiac event on the ECG?

P wave representing atrial depolarization
Dicrotic notch on arterial waveform corresponding to aortic valve closure (Correct answer)
T wave peak
QRS complex (ventricular depolarization/systole)

Correct answer: Dicrotic notch on arterial waveform corresponding to aortic valve closure

IABP inflation is timed to the dicrotic notch of the arterial pressure waveform, which represents aortic valve closure and the onset of diastole.

Question 14: Warm blood cardioplegia is delivered at approximately what temperature?

4°C
10°C
28°C
37°C (Correct answer)

Correct answer: 37°C

Warm blood cardioplegia is delivered at normothermia (approximately 37°C) to maintain aerobic metabolism while the heart is arrested.

Question 15: In the context of cardiopulmonary bypass, which statement about the systemic inflammatory response syndrome (SIRS) is most accurate?

SIRS only occurs in pediatric patients on CPB
Contact of blood with the CPB circuit activates complement, cytokines, and neutrophils (Correct answer)
Hypothermia abolishes the inflammatory response during CPB
SIRS is caused exclusively by protamine administration

Correct answer: Contact of blood with the CPB circuit activates complement, cytokines, and neutrophils

Blood contact with artificial surfaces activates complement cascades, releases cytokines, and primes neutrophils, generating a SIRS response during CPB.

Question 16: What is the typical target activated clotting time (ACT) maintained during full cardiopulmonary bypass?

300–350 seconds
550–600 seconds
200–250 seconds
400–480 seconds (Correct answer)

Correct answer: 400–480 seconds

An ACT of 400–480 seconds is the standard target during full CPB to prevent thrombosis in the extracorporeal circuit.

Question 17: When a patient has a valid Do Not Resuscitate (DNR) order and requires cardiac surgery, the most appropriate approach for the perfusion team is to:

Discuss perioperative DNR management with the surgeon and anesthesiologist before the case and document the agreed plan (Correct answer)
Contact the ethics committee during the procedure if cardiac arrest occurs
Automatically suspend the DNR during surgery without discussion
Refuse to participate in the case

Correct answer: Discuss perioperative DNR management with the surgeon and anesthesiologist before the case and document the agreed plan

Best practice requires pre-procedure discussion of DNR status and perioperative suspension or modification, documented with multidisciplinary agreement before the operation begins.

Question 18: Which document most directly governs the scope of practice for a cardiovascular perfusionist employed at a hospital?

The ABCP certification examination blueprint
The manufacturer's instructions for use of the heart-lung machine
State licensure law (where applicable) combined with institutional credentialing and privilege documents (Correct answer)
The American Heart Association CPR guidelines

Correct answer: State licensure law (where applicable) combined with institutional credentialing and privilege documents

Scope of practice is defined by applicable state law combined with the specific clinical privileges granted by the employing institution through its credentialing process.

Question 19: What is the standard protocol for weaning a patient off cardiopulmonary bypass?

Wait for the surgeon to manually restart the heart
Reduce flow to zero then restart the heart
Gradually reduce pump flow while the heart resumes function, monitoring hemodynamics for stability (Correct answer)
Immediately stop the pump

Correct answer: Gradually reduce pump flow while the heart resumes function, monitoring hemodynamics for stability

Weaning involves gradually reducing pump support as the heart resumes pumping, with careful monitoring of hemodynamics, rhythm, and contractility.

Question 20: What blood products may be needed after cardiac surgery?

Only saline solutions
Only whole blood
No blood products are ever needed
Packed red blood cells, platelets, fresh frozen plasma, and cryoprecipitate depending on specific deficiencies (Correct answer)

Correct answer: Packed red blood cells, platelets, fresh frozen plasma, and cryoprecipitate depending on specific deficiencies

Different blood products address specific deficiencies: PRBCs for anemia, platelets for thrombocytopenia, FFP for clotting factor deficiency, and cryoprecipitate for fibrinogen deficiency.

Question 21: Desmopressin (DDAVP) is indicated in cardiac surgery primarily to treat bleeding associated with:

Heparin rebound after protamine reversal
Antithrombin III deficiency
Acquired platelet dysfunction including uremic and aspirin-related defects (Correct answer)
Hypofibrinogenemia post-bypass

Correct answer: Acquired platelet dysfunction including uremic and aspirin-related defects

DDAVP stimulates endothelial release of stored von Willebrand factor, enhancing platelet adhesion and aggregation, making it effective for uremic platelet dysfunction and aspirin-induced platelet defects.

Question 22: What temperature range is typically used for cold blood cardioplegia delivery?

20°C
4–10°C (Correct answer)
28°C
37°C

Correct answer: 4–10°C

Cold cardioplegia (4–10°C) reduces myocardial metabolic demand by lowering temperature, slowing enzymatic reactions.

Question 23: Which type of pump is most commonly used in modern ECMO circuits?

Centrifugal pump (Correct answer)
Axial flow pump
Roller pump
Pulsatile diaphragm pump

Correct answer: Centrifugal pump

Centrifugal pumps are preferred in ECMO because they are less traumatic to blood cells, have no tubing wear, and are safer if flow is occluded.

Question 24: What is the normal range for blood gas pH during cardiopulmonary bypass?

7.35 to 7.45 (Correct answer)
6.8 to 7.0
7.5 to 7.6
7.0 to 7.2

Correct answer: 7.35 to 7.45

Maintaining pH in the normal range of 7.35-7.45 during bypass is essential for proper enzyme function and cellular metabolism.

Question 25: Which coagulation factor is most significantly reduced by hemodilution and consumption during cardiopulmonary bypass?

Factor V
Factor XII
Factor I (Fibrinogen) (Correct answer)
Factor VIII

Correct answer: Factor I (Fibrinogen)

Fibrinogen (Factor I) is the most significantly reduced coagulation protein during CPB due to hemodilution, consumption by the coagulation cascade, and fibrinolysis.

Question 26: What does mixed venous oxygen saturation (SvO2) indicate during bypass?

The balance between oxygen delivery and consumption (Correct answer)
Arterial oxygen levels only
Heart rate adequacy
The amount of carbon dioxide in the blood

Correct answer: The balance between oxygen delivery and consumption

SvO2 reflects the balance between oxygen delivery and tissue consumption. Low values indicate inadequate perfusion or increased oxygen demand.

Question 27: A perfusionist notices the venous reservoir level is dropping rapidly despite adequate venous return. The most immediate action is to:

Switch to the backup pump head
Increase cardioplegia delivery rate
Increase arterial flow to compensate
Reduce pump flow to prevent air entrainment (Correct answer)

Correct answer: Reduce pump flow to prevent air entrainment

Reducing pump flow prevents the reservoir from emptying and air from entering the arterial line, which is the most immediate life-threatening risk.

Question 28: The Safe Medical Devices Act (SMDA) requires hospitals to report device-related deaths directly to:

The hospital's insurance carrier
Both the FDA and the device manufacturer (Correct answer)
The state health department only
The surgeon who used the device

Correct answer: Both the FDA and the device manufacturer

The SMDA mandates that user facilities (hospitals) report device-related deaths to both the FDA and the manufacturer, and serious injuries to the manufacturer (or FDA if the manufacturer is unknown).

Question 29: What is myocardial ischemia-reperfusion injury?

Injury caused by hypothermia during CPB
Damage occurring solely during cardioplegia delivery
Electrical damage from defibrillation after surgery
Tissue damage that paradoxically occurs when blood flow is restored to ischemic myocardium (Correct answer)

Correct answer: Tissue damage that paradoxically occurs when blood flow is restored to ischemic myocardium

Reperfusion injury results from oxidative stress, calcium overload, and inflammatory activation that occur when oxygenated blood returns to previously ischemic tissue.

Question 30: Which federal agency has primary authority over medical devices used in cardiopulmonary bypass, including oxygenators and heart-lung machines?

Occupational Safety and Health Administration (OSHA)
Centers for Medicare & Medicaid Services (CMS)
Joint Commission on Accreditation of Healthcare Organizations (JCAHO)
Food and Drug Administration (FDA) (Correct answer)

Correct answer: Food and Drug Administration (FDA)

The FDA regulates medical devices under the Federal Food, Drug, and Cosmetic Act, including all cardiopulmonary bypass equipment such as oxygenators, blood pumps, and tubing.

ABCP Perfusion Basic Science Examination (PBSE) — Certified Clinical Perfusionist

The ABCP PBSE assesses foundational and applied knowledge required for clinical cardiovascular perfusionists, covering cardiopulmonary bypass, pharmacology, ECMO, myocardial protection, and extracorporeal circulatory support. Passing is required for CCP certification by the American Board of Cardiovascular Perfusion.

Questions

35 min

Time Limit

70%

To Pass

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