Calculate the ejection fraction from the
given volume pressure curve:
a) 40%
b) 50%
c) 55%
d) 60%
Correct Answer - D
Ans: D. 60%
(Ref Gunong 25/e p540 24/e p542)
Ejection fraction calculated from the given volume pressure curve is
60%.
Pressure Volume Loop:
ab: isovolumetric contraction
bc: Ventricular contraction during systole
cd: Isovolumetric relaxation.
Calculation:
End-Diastolic Volume (EDV) (Point a) = 130 mL
End Systolic Volume (ESV) (Point d) = 50 mL
Stroke Volume (SV) = EDV–ESV = 80 mL
Ejection Fraction = SV/EDV = 80/130 = 0.6 i.e. % EF = 60%.