CVP Cardiopulmonary Bypass (CPB) Management 2

Question 1

During CPB, what is the primary purpose of the membrane oxygenator?

Accepted Answer

To add oxygen and remove carbon dioxide from blood

Answer

The membrane oxygenator performs gas exchange by adding oxygen and removing carbon dioxide from venous blood, replacing lung function during CPB.

Question 2

What is the typical target activated clotting time (ACT) maintained during full cardiopulmonary bypass?

Accepted Answer

400–480 seconds

Answer

An ACT of 400–480 seconds is the standard target during full CPB to prevent thrombosis in the extracorporeal circuit.

Question 3

A patient on CPB develops sudden arterial line pressure drop with increased venous reservoir level. What is the most likely cause?

Accepted Answer

Venous air lock

Answer

Venous air lock impedes venous drainage, causing blood to accumulate in the venous reservoir while arterial pressure drops due to reduced pump output.

Question 4

Which parameter most directly reflects adequate systemic perfusion during CPB in an adult?

Accepted Answer

Mixed venous oxygen saturation (SvO2)

Answer

SvO2 reflects the balance between oxygen delivery and consumption, providing the most direct indicator of systemic perfusion adequacy during CPB.

Question 5

During hypothermic CPB, what change in blood viscosity is expected and how is it typically managed?

Accepted Answer

Increased viscosity; managed with hemodilution

Answer

Hypothermia increases blood viscosity, which is counteracted through hemodilution with crystalloid prime to maintain adequate microcirculatory flow.

(CVP) Cardiovascular Perfusionist Practice Test

(CVP) Cardiovascular Perfusionist Practice Test

CVP Cardiopulmonary Bypass (CPB) Management 2