CCP Hemodynamic Monitoring During Bypass 3

Question 1

A perfusionist notices the reservoir level is falling despite adequate venous return. Which hemodynamic sign would first alert the team to impending venous air entrainment?

Accepted Answer

Visible air bubbles in the venous line

Answer

Visible air bubbles in the venous line are the earliest direct sign of air entrainment before it reaches the oxygenator or arterial circuit.

Question 2

During CPB, systemic vascular resistance (SVR) is calculated using which formula?

Accepted Answer

(MAP – CVP) / CO × 80

Answer

SVR = (MAP – CVP) / CO × 80, where the pressure gradient across the systemic circulation is divided by cardiac output and converted to dyne·s·cm⁻⁵.

Question 3

An arteriovenous oxygen content difference (AVDO2) greater than 6.0 mL/dL during CPB most likely reflects:

Accepted Answer

Inadequate perfusion flow relative to oxygen demand

Answer

An AVDO2 above 6 mL/dL indicates tissues are extracting an unusually large fraction of delivered oxygen, consistent with inadequate perfusion flow.

Question 4

Which variable, when monitored continuously, provides the most direct real-time index of global oxygen delivery adequacy during CPB?

Accepted Answer

Mixed venous oxygen saturation (SvO2)

Answer

Continuous SvO2 monitoring reflects the real-time balance between oxygen delivery and consumption across the entire body, making it the best continuous global index.

Question 5

During rewarming on CPB, a perfusionist observes a gradual decline in MAP from 65 to 45 mmHg. The most appropriate first intervention is:

Accepted Answer

Administer a vasopressor such as phenylephrine

Answer

Vasodilation during rewarming commonly causes hypotension; administering a vasopressor to restore SVR is the primary hemodynamic intervention.

(CCP) Certified Clinical Perfusionist Practice Test

(CCP) Certified Clinical Perfusionist Practice Test

CCP Hemodynamic Monitoring During Bypass 3