Cardiac Performance

Question 0

What four factors determine cardiac output?

Answer 0

Preload

afterload

contractility

heart rate

Question 1

What is the formula for cardiac output?

Answer 1

CO=HR x SV

The volume of blood thru heart in 1 minute.

Question 2

What is heart rate dependent upon?

Answer 2

Multi area activity

Question 3

Explain preload

Answer 3

Ventricular end diastolic volume

Volume and associated generated pressure

Question 4

What is pre-load determined by

Answer 4

Amount of venous return and

blood left in ventricle

Question 5

Frank starling law of the heart is?

Answer 5

The greater the volume the stronger the contraction.

Question 6

What is afterload?

Answer 6

Resistance to ejection of blood

Question 7

What is afterload determined by?

Answer 7

System vascular resistance and aorta arteries and arterioles.

Question 8

Low afterload equals

Answer 8

More effective contraction

Question 9

High afterload equals

Answer 9

Increased work load of heart

Question 10

Myocardial Contractility

What three forces determine the force of contraction?

Answer 10

Changes in preload

inotropic drugs

adequacy of myocardial oxygen supply