CCP Hemodynamic Monitoring During Bypass 2

Question 1

During CPB, a sudden drop in arterial line pressure with unchanged pump flow most likely indicates which of the following?

Accepted Answer

Aortic dissection at the cannulation site

Answer

A sudden pressure drop with unchanged flow suggests aortic dissection, where blood tracks into the false lumen reducing effective forward perfusion.

Question 2

Which pulmonary artery catheter parameter is most useful for assessing right ventricular afterload during CPB?

Accepted Answer

Pulmonary vascular resistance

Answer

Pulmonary vascular resistance (PVR) directly quantifies the impedance against which the right ventricle must eject, making it the best measure of RV afterload.

Question 3

A mixed venous oxygen saturation (SvO2) of 55% during normothermic CPB at a flow of 2.4 L/min/m² suggests:

Accepted Answer

Increased oxygen consumption or reduced flow

Answer

SvO2 below 65% at normothermia indicates oxygen extraction is elevated, reflecting either insufficient delivery or increased metabolic demand.

Question 4

When the arterial blood pressure waveform dampens and the pulse pressure narrows significantly during full CPB, the most likely explanation is:

Accepted Answer

A kinked or partially occluded arterial pressure line

Answer

A dampened waveform with narrow pulse pressure typically results from a mechanical obstruction or air bubble in the monitoring line rather than a true hemodynamic event.

Question 5

During hypothermic CPB at 28°C, the target mean arterial pressure recommended to ensure adequate cerebral perfusion in most adult patients is:

Accepted Answer

50–70 mmHg

Answer

Most guidelines recommend maintaining MAP between 50–70 mmHg during moderate hypothermic CPB, balancing cerebral perfusion with surgical field conditions.

(CCP) Certified Clinical Perfusionist Practice Test

(CCP) Certified Clinical Perfusionist Practice Test

CCP Hemodynamic Monitoring During Bypass 2