Cardiac Surgery Certification Exam Cardiopulmonary Bypass Techniques 2

Question 1

Which agent is most commonly used to achieve myocardial protection during aortic cross-clamping?

Accepted Answer

Cardioplegia solution

Answer

Cardioplegia solution arrests the heart and protects myocardium from ischemia during aortic cross-clamping.

Question 2

What is the primary advantage of retrograde cardioplegia delivery via the coronary sinus?

Accepted Answer

Ensures cardioplegia reaches areas with obstructed coronary arteries

Answer

Retrograde cardioplegia via the coronary sinus ensures uniform myocardial protection even in areas distal to severely stenotic coronary arteries.

Question 3

Hypothermia during CPB protects organs primarily by:

Accepted Answer

Reducing metabolic demand and oxygen consumption

Answer

Hypothermia decreases cellular metabolic rate and oxygen demand, extending the safe ischemic time for organs during CPB.

Question 4

Which complication is most commonly associated with excessive hemodilution on cardiopulmonary bypass?

Accepted Answer

Coagulopathy and impaired oxygen delivery

Answer

Excessive hemodilution dilutes clotting factors and reduces hemoglobin concentration, leading to coagulopathy and decreased oxygen-carrying capacity.

Question 5

The arterial filter in the CPB circuit is used primarily to:

Accepted Answer

Remove gaseous and particulate microemboli before arterial return

Answer

The arterial line filter captures microemboli (air bubbles and particulates) to prevent them from reaching the patient's systemic circulation.

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