Hemodynamics

Question 1

What is preload?

Answer 1

Volume of blood in the ventricle at end-diastole. Muscle stretch at end diastole.

Question 2

Increase/decrease in preload means what for SV?

Answer 2

Increase in preload = increase in SV
Decrease in preload = decrease in SV

Question 3

What is afterload?

Answer 3

Tension of emptying that must be overcome. Resistance to ventricular emptying.

Question 4

Increase/decrease in afterload means what for SV?

Answer 4

Increase in afterload = decrease in SV
Decrease in afterload = increase in SV

Question 5

What is inotropic force?

Answer 5

Contractility of the heart muscle or force of contraction.

Question 6

What is chronotropic force?

Answer 6

Rate of contraction / heart rate.

Question 7

Increase/decrease in inotropy means what for SV?

Answer 7

Increase in inotropy = increase in SV
Decrease in inotropy = decrease in SV

Question 8

What is the Frank-Starling law?

Answer 8

More preload (more volume delivered to the heart) = more SV (more volume ejected).