ECMO Specialist Exam 101 Official Exam Actual
Exam Complete Questions and Answers Detailed
Rationales Pass Guaranteed - A+ Graded
TABLE OF CONTENTS
Section 1 | ECMO Circuit and Components | Q1 – Q10
Section 2 | Patient Selection and Cannulation | Q11 – Q20
Section 3 | Physiology and Gas Exchange Management | Q21 – Q30
Section 4 | Complications and Troubleshooting | Q31 – Q40
Section 5 | Weaning, Decannulation, and Quality Assurance | Q41 – Q50
Instructions: Choose the single best answer. Pass: 80% in 90 minutes.
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SECTION 1: ECMO CIRCUIT AND COMPONENTS Q1 – Q10
══════════════════════════════════════
Question 1 of 50
A 45-year-old man is on femoral-femoral VA ECMO for postcardiotomy cardiogenic
shock. The perfusionist notes that the centrifugal pump in use employs magnetic
levitation bearings rather than a mechanical pivot.
A. Roller pumps provide non-occlusive flow and are preferred for long-term support
because they generate less hemolysis
B. Centrifugal pumps with magnetic levitation generate less hemolysis and heat
compared with older roller pumps ✓ CORRECT
C. Positive displacement pumps are the current standard for all modern ECMO circuits
regardless of anticipated duration
D. The pump head must be exchanged every 24 hours to prevent thrombus formation
regardless of design
Correct Answer: B
,Rationale: Centrifugal pumps with magnetic levitation eliminate mechanical bearing
contact, thereby minimizing heat generation, hemolysis, and thrombus formation at the
pump head during prolonged support. Roller pumps are positive-displacement devices
that cause more blood trauma through occlusive compression and are rarely used in
modern ECMO. Magnetic levitation technology has become the standard in
contemporary circuits because it extends the safe duration of extracorporeal support.
Question 2 of 50
A 28-year-old woman with severe ARDS is initiated on VV ECMO. The team selects a
membrane oxygenator for the circuit and discusses gas-exchange properties during
setup.
A. The oxygenator should be flushed with pure oxygen at 15 L/min before patient
connection to maximize initial efficiency
B. Silicone membrane oxygenators remain the standard of care due to superior
gas-exchange efficiency and durability
C. Microporous hollow-fiber oxygenators allow gas exchange through diffusion across a
polymethylpentene barrier ✓ CORRECT
D. The oxygenator is placed distal to the pump in all ECMO configurations to reduce
afterload on the right ventricle
Correct Answer: C
Rationale: Modern hollow-fiber oxygenators constructed from polymethylpentene
provide efficient gas exchange through diffusion while minimizing plasma leakage
compared with earlier silicone devices. Silicone oxygenators have largely been replaced
in contemporary practice because hollow-fiber designs offer improved efficiency and
require less priming volume. Proper de-airing of the oxygenator before connection is
essential because residual air can embolize to the patient.
Question 3 of 50
,A 56-year-old man is being prepared for VA ECMO, and the team inspects the tubing
circuit before priming. The bedside nurse asks about the heparin coating visible on the
cannulas and tubing segments.
A. Biocompatible surface coatings such as heparin or phosphorylcholine reduce
thrombogenicity and complement activation ✓ CORRECT
B. Standard PVC tubing without coating is preferred because it is more durable and
significantly less expensive
C. Circuit tubing should be changed on a fixed schedule every 48 hours to prevent
bacterial colonization
D. Connectors should be rigid and opaque to withstand high negative pressures
generated by the pump
Correct Answer: A
Rationale: Heparin-bonded or phosphorylcholine-coated circuits reduce surface
thrombogenicity, diminish complement activation, and may allow lower anticoagulation
intensity during ECMO support. Uncoated PVC is more thrombogenic and requires
higher anticoagulant exposure, increasing bleeding risk. While circuit changes are
performed when clinically indicated, routine exchange every 48 hours is unnecessary
and increases bleeding and infection risk.
Question 4 of 50
A 34-year-old woman on VV ECMO becomes febrile to 39.2°C. The bedside nurse
adjusts the heater-cooler unit in an attempt to lower her core temperature.
A. The heater-cooler device should be filled with tap water to maintain cost efficiency
and adequate heat transfer
B. Patient temperature is controlled exclusively by adjusting the ambient room
temperature and fan speed
C. Hypothermia is universally contraindicated in ECMO because it causes irreversible
platelet dysfunction and bleeding
D. The heater-cooler unit regulates blood temperature via a heat exchanger integrated
into the circuit ✓ CORRECT
, Correct Answer: D
Rationale: The heater-cooler device connects to a heat exchanger within the ECMO
circuit, allowing precise regulation of blood temperature as it passes through the
oxygenator. Room temperature adjustments alone cannot reliably control core
temperature in an extracorporeal circuit, and mild hypothermia is sometimes used
intentionally to reduce metabolic demand. The water reservoir should be filled with
sterile or deionized water according to manufacturer guidelines to prevent bacterial
contamination.
Question 5 of 50
A 62-year-old man on VA ECMO has a PaCO2 of 32 mmHg despite adequate
oxygenation. The respiratory therapist is asked to adjust the blender and sweep gas
flow.
A. The blender mixes room air with carbon dioxide to achieve target PaCO2 levels
through controlled rebreathing
B. Sweep gas flow rate primarily controls oxygenation while the FiO2 setting controls
carbon dioxide removal
C. Increasing sweep gas flow increases carbon dioxide removal by enhancing the
diffusion gradient across the membrane ✓ CORRECT
D. The blender should deliver 100% oxygen at all times to maximize oxygenator
longevity and prevent nitrogen embolism
Correct Answer: C
Rationale: Carbon dioxide removal is primarily governed by sweep gas flow rate
because a higher flow maintains a steeper diffusion gradient between the blood and
gas phases, driving CO2 out of the circuit. Oxygenation is primarily controlled by the
fraction of delivered oxygen and the blood flow rate rather than sweep gas alone.
Setting the blender to 100% oxygen at all times is unnecessary and does not improve
oxygenator longevity.
Exam Complete Questions and Answers Detailed
Rationales Pass Guaranteed - A+ Graded
TABLE OF CONTENTS
Section 1 | ECMO Circuit and Components | Q1 – Q10
Section 2 | Patient Selection and Cannulation | Q11 – Q20
Section 3 | Physiology and Gas Exchange Management | Q21 – Q30
Section 4 | Complications and Troubleshooting | Q31 – Q40
Section 5 | Weaning, Decannulation, and Quality Assurance | Q41 – Q50
Instructions: Choose the single best answer. Pass: 80% in 90 minutes.
══════════════════════════════════════
SECTION 1: ECMO CIRCUIT AND COMPONENTS Q1 – Q10
══════════════════════════════════════
Question 1 of 50
A 45-year-old man is on femoral-femoral VA ECMO for postcardiotomy cardiogenic
shock. The perfusionist notes that the centrifugal pump in use employs magnetic
levitation bearings rather than a mechanical pivot.
A. Roller pumps provide non-occlusive flow and are preferred for long-term support
because they generate less hemolysis
B. Centrifugal pumps with magnetic levitation generate less hemolysis and heat
compared with older roller pumps ✓ CORRECT
C. Positive displacement pumps are the current standard for all modern ECMO circuits
regardless of anticipated duration
D. The pump head must be exchanged every 24 hours to prevent thrombus formation
regardless of design
Correct Answer: B
,Rationale: Centrifugal pumps with magnetic levitation eliminate mechanical bearing
contact, thereby minimizing heat generation, hemolysis, and thrombus formation at the
pump head during prolonged support. Roller pumps are positive-displacement devices
that cause more blood trauma through occlusive compression and are rarely used in
modern ECMO. Magnetic levitation technology has become the standard in
contemporary circuits because it extends the safe duration of extracorporeal support.
Question 2 of 50
A 28-year-old woman with severe ARDS is initiated on VV ECMO. The team selects a
membrane oxygenator for the circuit and discusses gas-exchange properties during
setup.
A. The oxygenator should be flushed with pure oxygen at 15 L/min before patient
connection to maximize initial efficiency
B. Silicone membrane oxygenators remain the standard of care due to superior
gas-exchange efficiency and durability
C. Microporous hollow-fiber oxygenators allow gas exchange through diffusion across a
polymethylpentene barrier ✓ CORRECT
D. The oxygenator is placed distal to the pump in all ECMO configurations to reduce
afterload on the right ventricle
Correct Answer: C
Rationale: Modern hollow-fiber oxygenators constructed from polymethylpentene
provide efficient gas exchange through diffusion while minimizing plasma leakage
compared with earlier silicone devices. Silicone oxygenators have largely been replaced
in contemporary practice because hollow-fiber designs offer improved efficiency and
require less priming volume. Proper de-airing of the oxygenator before connection is
essential because residual air can embolize to the patient.
Question 3 of 50
,A 56-year-old man is being prepared for VA ECMO, and the team inspects the tubing
circuit before priming. The bedside nurse asks about the heparin coating visible on the
cannulas and tubing segments.
A. Biocompatible surface coatings such as heparin or phosphorylcholine reduce
thrombogenicity and complement activation ✓ CORRECT
B. Standard PVC tubing without coating is preferred because it is more durable and
significantly less expensive
C. Circuit tubing should be changed on a fixed schedule every 48 hours to prevent
bacterial colonization
D. Connectors should be rigid and opaque to withstand high negative pressures
generated by the pump
Correct Answer: A
Rationale: Heparin-bonded or phosphorylcholine-coated circuits reduce surface
thrombogenicity, diminish complement activation, and may allow lower anticoagulation
intensity during ECMO support. Uncoated PVC is more thrombogenic and requires
higher anticoagulant exposure, increasing bleeding risk. While circuit changes are
performed when clinically indicated, routine exchange every 48 hours is unnecessary
and increases bleeding and infection risk.
Question 4 of 50
A 34-year-old woman on VV ECMO becomes febrile to 39.2°C. The bedside nurse
adjusts the heater-cooler unit in an attempt to lower her core temperature.
A. The heater-cooler device should be filled with tap water to maintain cost efficiency
and adequate heat transfer
B. Patient temperature is controlled exclusively by adjusting the ambient room
temperature and fan speed
C. Hypothermia is universally contraindicated in ECMO because it causes irreversible
platelet dysfunction and bleeding
D. The heater-cooler unit regulates blood temperature via a heat exchanger integrated
into the circuit ✓ CORRECT
, Correct Answer: D
Rationale: The heater-cooler device connects to a heat exchanger within the ECMO
circuit, allowing precise regulation of blood temperature as it passes through the
oxygenator. Room temperature adjustments alone cannot reliably control core
temperature in an extracorporeal circuit, and mild hypothermia is sometimes used
intentionally to reduce metabolic demand. The water reservoir should be filled with
sterile or deionized water according to manufacturer guidelines to prevent bacterial
contamination.
Question 5 of 50
A 62-year-old man on VA ECMO has a PaCO2 of 32 mmHg despite adequate
oxygenation. The respiratory therapist is asked to adjust the blender and sweep gas
flow.
A. The blender mixes room air with carbon dioxide to achieve target PaCO2 levels
through controlled rebreathing
B. Sweep gas flow rate primarily controls oxygenation while the FiO2 setting controls
carbon dioxide removal
C. Increasing sweep gas flow increases carbon dioxide removal by enhancing the
diffusion gradient across the membrane ✓ CORRECT
D. The blender should deliver 100% oxygen at all times to maximize oxygenator
longevity and prevent nitrogen embolism
Correct Answer: C
Rationale: Carbon dioxide removal is primarily governed by sweep gas flow rate
because a higher flow maintains a steeper diffusion gradient between the blood and
gas phases, driving CO2 out of the circuit. Oxygenation is primarily controlled by the
fraction of delivered oxygen and the blood flow rate rather than sweep gas alone.
Setting the blender to 100% oxygen at all times is unnecessary and does not improve
oxygenator longevity.
