A 55-year-old man with a resting heart rate of 72 bpm has a stroke volume of 70 mL. His end-diastolic volume is 130 mL. What is his ejection fraction?
- A 54% ✓
- B 46%
- C 70%
- D 62%
Correct answer: A. 54%
Explanation
Ejection fraction (EF) = Stroke Volume / End-Diastolic Volume × 100. Here EF = 70/130 × 100 = 53.8%, approximately 54%. A normal EF is 55–65%; values below 40% indicate systolic dysfunction. EF is an important clinical index of left ventricular contractility.
Reference: Guyton & Hall, Textbook of Medical Physiology, 14th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
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