Cardiac Output Definitions/Equations

Question 1

What is stroke volume

Answer 1

volume ejected from ventricle on each beat

Question 2

Stroke volume equation

Answer 2

STroke volume = end diastolic volume - end systolic volume

Question 3

Cardiac output equation

Answer 3

Cardiac output = stroke volume * Heart rate

Question 4

What is ejection fraction

Answer 4

fraction of end-diastolic volume ejected in each stroke volume

Question 5

Ejection fraction is related to ____

Answer 5

contractility

Question 6

Normal ejection fraction = ____

Answer 6

55%

Question 7

Ejection fraction equation

Answer 7

Ejection fraction = stroke volume / end-diastolic volume

Question 8

What is stroke work

Answer 8

work heart performs on each beat

Question 9

equation for stroke work

Answer 9

stroke work = aortic pressure * stroke volume

Question 10

Cardiac oxygen consumption is related to ____

Answer 10

amount of tension developed by ventricles

Question 11

Cardiac oxygen consumption is increased by (4 things)

Answer 11

1) incr afterload (incr aortic pressure)
2) incr size of heart (Laplace law says tension is proportional to radius of sphere)
3) incr contractility
4) incr HR

Question 12

What is Fick Principle

Answer 12

meausres cardiac output

Question 13

equation for fick Principle

Answer 13

Cardiac output = O2 consumption / ({O2}pulm vein - {O2}pulm artery)

Question 14

For fick equation, what is [O2]pulm vein synonymous with?

Answer 14

systemic arterial blood

Question 15

For fick equation, what is [O2] pulm artery synonymous with

Answer 15

systemic mixed venous blood