A 22-year-old m an was adm itted to the hospital for evaluation of a faint systolic m urm ur and an.

A 22-year-old m an was adm itted to the hospital for evaluation of a faint systolic m urm ur and an unusual electrocardiogram reading. After clinical and lab evaluation, a diagnosis of hypertrophic cardiomyopathy was m ade, and propranolol was prescribed. Which of the follow ing actions m ost likely contributed to the therapeutic e cacy of the drug in the patient’s disease? a. Decreased renin secretion b. Increased duration of diastole c. Blockade of an abnorm al pacem aker d. Decreased ejection fraction e. Coronary vasodilation

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