CCI - Cardiovascular Credentialing International Vascular Hemodynamics Principles Questions and Answers

Question 1

According to Poiseuille's Law, which factor has the most significant impact on resistance to blood flow within a vessel?

Accepted Answer

Vessel radius

Answer

Blood viscosity

Answer

Vessel length

Answer

Pressure gradient

Question 2

A patient is found to have two separate, sequential 50% stenoses (tandem lesions) in the left anterior descending artery. How does the total hemodynamic effect of these two lesions compare to a single, longer 50% stenosis?

Accepted Answer

The tandem lesions will have a greater hemodynamic effect than the single long lesion.

Answer

The tandem lesions will have less of a hemodynamic effect than the single long lesion.

Answer

The hemodynamic effect is identical in both scenarios.

Answer

The effect depends solely on the distance between the two tandem lesions.

Question 3

The simplified Bernoulli equation (ΔP = 4v²) is used in echocardiography to estimate the pressure gradient across a stenotic valve. This equation is derived from the principle of:

Accepted Answer

Conservation of energy

Answer

Conservation of mass

Answer

Ohm's Law

Answer

Poiseuille's Law

Question 4

In the context of vascular hemodynamics, the relationship 'Flow = Pressure Gradient / Resistance' is analogous to which fundamental law of electricity?

Accepted Answer

Ohm's Law

Answer

Faraday's Law

Answer

Coulomb's Law

Answer

Kirchhoff's Law

Question 5

A sonographer is using the continuity equation to calculate the aortic valve area. The principle underlying this equation is that, in the absence of intracardiac shunts or significant regurgitation, the:

Accepted Answer

Stroke volume through the LVOT must equal the stroke volume through the aortic valve.

Answer

Pressure gradient across the LVOT and aortic valve must be equal.

Answer

Velocity of blood flow is constant from the LVOT through the aortic valve.

Answer

Kinetic energy of blood is converted entirely to potential energy after the valve.

Question 6

Which of the following conditions would most likely lead to an increase in blood viscosity and, consequently, an increase in vascular resistance?

Accepted Answer

Polycythemia

Answer

Anemia

Answer

Vasodilation

Answer

Hypothermia