CCP CPB Circuit Assembly & Priming 3

Question 1

Which centrifugal pump characteristic distinguishes it from a roller pump during CPB?

Accepted Answer

Its flow is non-occlusive and afterload-dependent

Answer

Centrifugal pumps are afterload-sensitive and will reduce flow if arterial resistance increases, unlike roller pumps which deliver a set volume per revolution.

Question 2

The standard pore size of an arterial line filter used in CPB circuits is:

Accepted Answer

40 microns

Answer

Most arterial line filters use a 40-micron screen to capture clinically significant gaseous and particulate microemboli while maintaining adequate flow.

Question 3

During CPB priming, adding mannitol (0.5 g/kg) to the prime solution is intended primarily to:

Accepted Answer

Promote osmotic diuresis and reduce cerebral edema

Answer

Mannitol acts as an osmotic diuretic during CPB and may help reduce cellular swelling and free radical scavenging in ischemic tissues.

Question 4

A 'soft-shell' venous reservoir differs from a 'hard-shell' reservoir in that it:

Accepted Answer

Collapses as volume decreases, preventing air aspiration by the pump

Answer

Soft-shell (collapsible) reservoirs collapse when volume is low, providing a visual warning and preventing the pump from aspirating air.

Question 5

Which complication is most directly associated with roller pump tubing that is set too occlusively?

Accepted Answer

Excessive hemolysis and red blood cell destruction

Answer

Excessive roller pump occlusion increases shear stress on red blood cells as they pass through the compressed tubing segment, causing hemolysis.

(CCP) Certified Clinical Perfusionist Practice Test

(CCP) Certified Clinical Perfusionist Practice Test

CCP CPB Circuit Assembly & Priming 3