Cardiac Pt 1

Question 1

Cardiac output = ?

Answer 1

HR x SV

Question 2

Stroke vol is? is affected by?

Answer 2

The blood ejected from LV with each ventricular beat.
Preload, afterload, contractility, compliance

Question 3

Cardiac index = ?
Normal CI?

Answer 3

CO / BSA
3-4.2 L/min/m^2

Question 4

EF is?

Answer 4

Volume ejected vs volume remaining in vent

Question 5

Preload is? Is determined by? Is affected by?

Answer 5

Blood in vents at end of diastole prior to contraction
By cardiac fiber length/stretch, vol of blood returned from systemic and pulm circulation
Affected by variations in volume, systemic/pulmHTN, PEEP, dysrhythmias, vasopressors/inotropes

Question 6

Frank Starling law with cards

Answer 6

If muscle fibers are stretched too far, stroke vol decreases (stretched out rubber band). So For cards kids, vol can worsen them