Free ECMO Circuit Management & Troubleshooting Questions and Answers

Question 1

What is the primary function of the oxygenator in an ECMO circuit?

Accepted Answer

Add oxygen & remove carbon dioxide.

Answer

The oxygenator acts as the artificial lung within the ECMO circuit. Its primary function is to facilitate gas exchange by adding oxygen to the patient's blood and simultaneously removing carbon dioxide. This process is vital for supporting patients with severe respiratory or cardiac failure when their native lungs cannot perform this function adequately.

Question 2

Which indicator suggests a possible clot in the ECMO circuit?

Accepted Answer

Increased delta pressure across the oxygenator.

Answer

An increased delta pressure across the oxygenator signifies a higher resistance to blood flow through the device. This resistance is commonly caused by the formation of clots or fibrin deposition within the oxygenator's membrane. Monitoring this pressure difference is a critical indicator for detecting potential circuit thrombosis, which can impair gas exchange and overall ECMO effectiveness.

Question 3

What should be done if an air bubble is detected in the venous line?

Accepted Answer

Clamp the circuit & call for assistance.

Answer

An air bubble in the venous line poses an immediate and severe risk of air embolism to the patient, which can be life-threatening. Clamping the circuit immediately prevents the air from reaching the patient's circulation. Simultaneously calling for assistance ensures that trained personnel can safely remove the air and address the underlying cause, prioritizing patient safety.

Question 4

What is the best way to detect hemolysis in the ECMO circuit?

Accepted Answer

Observation of red-colored urine.

Answer

Hemolysis is the breakdown of red blood cells, releasing free hemoglobin into the bloodstream. When the kidneys filter this excess hemoglobin, it can cause the urine to appear red or dark brown, a condition known as hemoglobinuria. Observing red-colored urine is often the earliest and most direct clinical sign of significant hemolysis in an ECMO patient, indicating potential mechanical trauma to blood cells within the circuit.

Question 5

What is the most likely cause of decreased ECMO flow rate?

Accepted Answer

Cannula malposition or kinking.

Answer

The cannulas are essential components that connect the patient to the ECMO circuit. If a cannula becomes kinked, dislodged, or improperly positioned, it creates an obstruction to blood flow either entering or leaving the circuit. This mechanical impediment directly reduces the ECMO flow rate, compromising the delivery of support to the patient and requiring immediate assessment and correction.

CES - Certified ECMO Specialist Practice Test

CES - Certified ECMO Specialist Practice Test

Free ECMO Circuit Management & Troubleshooting Questions and Answers