Missouri Perfusionist Licensing Exam
Practice Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. Which component of the cardiopulmonary bypass circuit is primarily
responsible for oxygenating blood?
A. Heat exchanger
B. Oxygenator
C. Reservoir
D. Arterial filter
Answer: B. Oxygenator
Rationale: The oxygenator replaces gas exchange function of the
lungs by adding oxygen and removing carbon dioxide from blood
during bypass.
2. The primary purpose of systemic heparinization during
cardiopulmonary bypass is to:
A. Increase platelet aggregation
B. Prevent clot formation in the circuit
, C. Lower blood pressure
D. Enhance oxygen delivery
Answer: B. Prevent clot formation in the circuit
Rationale: Heparin prevents activation of the coagulation cascade,
reducing thrombus formation in the extracorporeal circuit.
3. A normal activated clotting time (ACT) target during bypass is
generally:
A. 80–120 seconds
B. 120–160 seconds
C. >480 seconds
D. 200–250 seconds
Answer: C. >480 seconds
Rationale: ACT is prolonged above 400–480 seconds to ensure
adequate anticoagulation during CPB.
4. The arterial line filter is used primarily to:
A. Remove air and microemboli
B. Increase oxygen saturation
C. Heat the blood
D. Measure cardiac output
Answer: A. Remove air and microemboli
Rationale: The arterial filter traps particulate matter and gaseous
emboli before blood returns to the patient.
,5. The most common type of oxygenator used in modern CPB circuits is:
A. Bubble oxygenator
B. Membrane oxygenator
C. Roller oxygenator
D. Film oxygenator
Answer: B. Membrane oxygenator
Rationale: Membrane oxygenators provide efficient gas exchange
with reduced blood trauma and embolic risk.
6. Pump flow during adult cardiopulmonary bypass is typically
maintained at:
A. 0.5–1.0 L/min
B. 1.0–1.5 L/min
C. 2.2–2.6 L/min/m²
D. 5–6 L/min fixed
Answer: C. 2.2–2.6 L/min/m²
Rationale: Indexed flow rates maintain adequate systemic perfusion
based on body surface area.
7. Which acid-base imbalance is most commonly associated with
inadequate perfusion during bypass?
A. Respiratory alkalosis
B. Metabolic alkalosis
C. Metabolic acidosis
D. Respiratory acidosis
, Answer: C. Metabolic acidosis
Rationale: Poor tissue perfusion leads to anaerobic metabolism and
lactic acid accumulation.
8. The purpose of the heat exchanger in CPB is to:
A. Remove carbon dioxide
B. Control patient temperature
C. Filter leukocytes
D. Increase hematocrit
Answer: B. Control patient temperature
Rationale: Heat exchangers allow controlled hypothermia or
rewarming during cardiac surgery.
9. Heparin is typically reversed after CPB using:
A. Vitamin K
B. Protamine sulfate
C. Platelets
D. Fresh frozen plasma
Answer: B. Protamine sulfate
Rationale: Protamine binds heparin to neutralize its anticoagulant
effect.
10. A drop in venous oxygen saturation during CPB most likely
indicates:
A. Excess oxygen delivery
B. Increased metabolic demand or decreased flow
Practice Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. Which component of the cardiopulmonary bypass circuit is primarily
responsible for oxygenating blood?
A. Heat exchanger
B. Oxygenator
C. Reservoir
D. Arterial filter
Answer: B. Oxygenator
Rationale: The oxygenator replaces gas exchange function of the
lungs by adding oxygen and removing carbon dioxide from blood
during bypass.
2. The primary purpose of systemic heparinization during
cardiopulmonary bypass is to:
A. Increase platelet aggregation
B. Prevent clot formation in the circuit
, C. Lower blood pressure
D. Enhance oxygen delivery
Answer: B. Prevent clot formation in the circuit
Rationale: Heparin prevents activation of the coagulation cascade,
reducing thrombus formation in the extracorporeal circuit.
3. A normal activated clotting time (ACT) target during bypass is
generally:
A. 80–120 seconds
B. 120–160 seconds
C. >480 seconds
D. 200–250 seconds
Answer: C. >480 seconds
Rationale: ACT is prolonged above 400–480 seconds to ensure
adequate anticoagulation during CPB.
4. The arterial line filter is used primarily to:
A. Remove air and microemboli
B. Increase oxygen saturation
C. Heat the blood
D. Measure cardiac output
Answer: A. Remove air and microemboli
Rationale: The arterial filter traps particulate matter and gaseous
emboli before blood returns to the patient.
,5. The most common type of oxygenator used in modern CPB circuits is:
A. Bubble oxygenator
B. Membrane oxygenator
C. Roller oxygenator
D. Film oxygenator
Answer: B. Membrane oxygenator
Rationale: Membrane oxygenators provide efficient gas exchange
with reduced blood trauma and embolic risk.
6. Pump flow during adult cardiopulmonary bypass is typically
maintained at:
A. 0.5–1.0 L/min
B. 1.0–1.5 L/min
C. 2.2–2.6 L/min/m²
D. 5–6 L/min fixed
Answer: C. 2.2–2.6 L/min/m²
Rationale: Indexed flow rates maintain adequate systemic perfusion
based on body surface area.
7. Which acid-base imbalance is most commonly associated with
inadequate perfusion during bypass?
A. Respiratory alkalosis
B. Metabolic alkalosis
C. Metabolic acidosis
D. Respiratory acidosis
, Answer: C. Metabolic acidosis
Rationale: Poor tissue perfusion leads to anaerobic metabolism and
lactic acid accumulation.
8. The purpose of the heat exchanger in CPB is to:
A. Remove carbon dioxide
B. Control patient temperature
C. Filter leukocytes
D. Increase hematocrit
Answer: B. Control patient temperature
Rationale: Heat exchangers allow controlled hypothermia or
rewarming during cardiac surgery.
9. Heparin is typically reversed after CPB using:
A. Vitamin K
B. Protamine sulfate
C. Platelets
D. Fresh frozen plasma
Answer: B. Protamine sulfate
Rationale: Protamine binds heparin to neutralize its anticoagulant
effect.
10. A drop in venous oxygen saturation during CPB most likely
indicates:
A. Excess oxygen delivery
B. Increased metabolic demand or decreased flow
