Calculate the ejection fraction from the PV Loop of left ventricle given below:

Solved383 views2015 aiims physiology
1

Calculate the ejection fraction from the PV Loop of left ventricle given below:
pv_loop

[A]. 70%

[B]. 60%

[C]. 65%

[D]. 50%

Selected answer as best


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[D]. 50%
Explanation :-

This left ventricular pressure volume (P-V) loop shows two loops superimposed on one graph.

  • Point 4-1 is period of filling, Point 1 corresponds to end diastolic volume.

  • Point 2 corresponds to AV opening.

  • The phase between points 2 and 3 is known as the ejection phase

  • Point 3 corresponds to AV closure

  • Phase 3-4 is the ejection phase of ventricular relaxation

  • Point 4 – MV opening, the volume corresponds to end systolic volume.

  • Stroke volume is the width of the P-V loop, labelled as SV on the loop. It is the difference between end diastolic volume and end systolic volume

So, in the figure ESV =70, EDV = 140. EF = ESV/EDV % = 70/140% = 50%

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