Download presentation

Presentation is loading. Please wait.

Published byKellen Burlison Modified over 9 years ago

1
Cardiac Output: And Influencing Factors

2
Cardiac Output Amount of blood pumped out by each ventricle in 1 min CO = HR x SV

3
Cardiac Reserve The difference between resting and maximal CO

4
Stroke Volume SV = EDV – ESV –EDV (volume of blood in ventricle after diastole) –ESV (volume of blood remaining in ventricle after contraction) –With each beat, ~ 60% of blood in chambers is emptied

5
Frank-Starling law of the heart Preload = critical factor in determining SV

6
Preload Degree to which cardiac cells are stretched before contraction –Optimal length determined by: If max # of cross bridge attachments occur If max force of contraction occurs

7
Venous Return The volume of blood returning to heart and stretching ventricles If venous return increases, EDV increases; therefore SV increases Left and right ventricles have equal venous return; therefore blood does not “pool” or backflow in heart

8
Contractility Contractile strength of heart (due to increased CA 2+ ) Causes increased release of blood (therefore lower ESV)

9
Afterload Force to eject blood from ventricles Constant in healthy people; lower in people with hypertension (therefore increases ESV and decreases SV)

Similar presentations

© 2024 SlidePlayer.com Inc.

All rights reserved.

To make this website work, we log user data and share it with processors. To use this website, you must agree to our Privacy Policy, including cookie policy.

Ads by Google