Cardiovascular System · NEET PG Preparation Physiology
Which of the following interventions or conditions typically results in an increased ejection fraction (EF)?
Practice question from Cardiovascular System (NEET PG Preparation Physiology), with the correct answer and a step-by-step solution.
medium · MCQ · Q-1A1B3D
Which of the following interventions or conditions typically results in an increased ejection fraction (EF)?
- A.Administration of a negative inotropic drug
- B.Increased systemic arterial pressure (increased afterload)
- C.Sympathetic stimulation via beta-1 receptor activationCorrect answer
- D.Dilated cardiomyopathy with impaired contractility
Solution
Ejection fraction is stroke volume divided by end-diastolic volume. Sympathetic stimulation increases myocardial contractility (positive inotropy), which enhances stroke volume and thereby increases the ejection fraction. Negative inotropes, increased afterload, and impaired contractility decrease ejection fraction.
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