CO & cardiac cycle

11 terms by Rnkimmyjo

Create a new folder

Advertisement Upgrade to remove ads

With a-flutter, a-fib, or junctional rhythms a portion of the left ventricular filling is lost, what % of LVEDV is normally contributed by atrial contraction (kick)?

Passive diastolic filling accounts for 75% of left ventricular filling, with the atrial contraction causing an additional 25% filling of ventricles.

Define EF

The ratio of SV (end-diastolic volume minus end-systolic volume) to end-diastolic volume. EF = SV/EDV = (EDV-ESV)/EDV

Normal EF range

0.6-0.8 or 60-80%

What are the 2 determinants of CO?

SV & HR

What is cardiac index (CI)

CO divided by body surface area (BSA) in meters squared

Normal CI range

2.4-4.0 L/min/m2

When the ventricle fills more during diastole, more blood is ejected during systole. Whose law is this?

Starling's

Starling's law of the heart relates ventricular filling during diastole to what?

To the amount of blood ejected during systole. The greater the ventricular filling during diastole (the greater the preload) the greater the quantity of blood pumped into the aorta during systole.

Describe the process that causes ventricular myocyte relaxation

Ventricular myocyte contraction requires increased intracellular Ca. For the myocyte to relax, intracellular Ca must be reduced back to resting levels. Ca is sequestered in the SR thru energy dependent processes.

Describe where isovolumetric relaxation occurs on the left ventricular pressure volume loop.

Occurs from closure of the aortic valve to opening of the mitral valve

Describe where isovolumetric contraction occurs on the left ventricular pressure volume loop.

Occurs from closure of the MV to the opening of the AV.

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions above and try again

Example:

Reload the page to try again!

Reload

Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

NEW! Voice Recording

Create Set