Reduces blood pressure primarily by directly decreasing hea rate alone -: (A) Propranolol, (B) Prazosin, (C) Alpha methyl dopa, (D) Nitroprusside sodium
Answer is A. Ans. is 'a' i.e., Propranolol o Methyldopa is useful in the treatment of mild to moderately severe hypeension. It lowers blood pressure chiefly by reducing peripheral vascular resistance, with a variable reduction in hea rate and cardiac output. o Prazosin and nitroprusside are vasodilators and produce reflex tachycardia instead of causing bradycardia. o Propranolol is a non selective beta blocker and acts mainly by decreasing hea rate.