Calculate the ejection fraction from the PV Loop of left ventricle given below:
Calculate the ejection fraction from the PV Loop of left ventricle given below:
[A]. 70%
[B]. 60%
[C]. 65%
[D]. 50%
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[D]. 50%
Explanation :
This left ventricular pressure volume (PV) loop shows two loops superimposed on one graph.

Point 41 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 34 is the ejection phase of ventricular relaxation

Point 4 â€“ MV opening, the volume corresponds to end systolic volume.

Stroke volume is the width of the PV 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%