CVP CVP Myocardial Protection and Cardioplegia 2

Question 1

Warm blood cardioplegia is delivered at approximately what temperature?

Accepted Answer

37°C

Answer

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

Question 2

What is the primary advantage of Del Nido cardioplegia over traditional formulations?

Accepted Answer

It allows a single dose to provide 60–90 minutes of cardiac arrest

Answer

Del Nido cardioplegia is a single-dose, crystalloid-based formulation designed to maintain arrest for 60–90 minutes, reducing re-dosing interruptions.

Question 3

What is the purpose of adding magnesium to cardioplegia solution?

Accepted Answer

To provide membrane stabilization and reduce calcium-mediated injury

Answer

Magnesium acts as a physiologic calcium antagonist, stabilizing cell membranes and reducing calcium overload during ischemia.

Question 4

How often is cardioplegia typically re-dosed during prolonged cardiac arrest with intermittent technique?

Accepted Answer

Every 20–30 minutes

Answer

Intermittent cardioplegia is re-dosed every 20–30 minutes to replenish protective concentrations washed out by non-coronary collateral flow.

Question 5

Retrograde cardioplegia is preferred over antegrade delivery in which clinical situation?

Accepted Answer

Severe aortic regurgitation

Answer

In severe aortic regurgitation, antegrade cardioplegia leaks back into the left ventricle rather than perfusing the coronaries, making retrograde delivery more reliable.

(CVP) Cardiovascular Perfusionist Practice Test

(CVP) Cardiovascular Perfusionist Practice Test

CVP CVP Myocardial Protection and Cardioplegia 2