What is the ejection fraction for a 60-year-old woman whose left ventricular end-diastolic volume is 125 mL and left ventricular end-systolic volume is 55 mL?
A. 26%
B. 40%
C. 56%
D. 70%
C
Ejection fraction is the percentage of blood leaving the left ventricle with systolic contraction (stroke volume). The stroke volume is calculated by subtracting the volume remaining in the left ventricle after systolic contraction (55 mL) from the volume in the left ventricle at the end of di-astole (125 mL), or 70 mL. In this situation, the stroke volume (70 mL) is 56% of the total left ventricular end-diastolic volume (125 mL).
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