A patient is found to have a left ventricular end-diastolic volume of 140 mL and an end-systolic volume of 70 mL. Aortic diastolic pressure is 80 mmHg and left ventricular systolic pressure at peak is 130 mmHg. Which of the following correctly describes the pressure-volume loop of this ventricle?
- A Stroke volume is 70 mL and ejection fraction is 50% ✓
- B Stroke volume is 140 mL and ejection fraction is 100%
- C Stroke volume is 70 mL and ejection fraction is 70%
- D Stroke volume is 70 mL and ejection fraction is 35%
Correct answer: A. Stroke volume is 70 mL and ejection fraction is 50%
Explanation
Stroke volume equals LVEDV minus LVESV: 140 − 70 = 70 mL. Ejection fraction = SV/LVEDV = 70/140 = 50%, which is the lower limit of normal. The pressure-volume loop width represents SV, while EF reflects systolic contractile efficiency; both are simultaneously described by option A.
Reference: Guyton & Hall, Textbook of Medical Physiology, 14th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
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