QuestionAugust 17, 2025

Which of the following medications is LEAST likely to cause reflex tachycardia? Diltiazem Amyl nitrate Nifedipine Minoxidil Hydralazine

Which of the following medications is LEAST likely to cause reflex tachycardia? Diltiazem Amyl nitrate Nifedipine Minoxidil Hydralazine
Which of the following medications is LEAST likely to cause reflex tachycardia?
Diltiazem
Amyl nitrate
Nifedipine
Minoxidil
Hydralazine

Solution
4.1(264 votes)

Answer

Diltiazem Explanation 1. Identify the mechanism of reflex tachycardia Reflex tachycardia occurs when vasodilation leads to a decrease in blood pressure, prompting the heart to beat faster to maintain cardiac output. 2. Analyze each medication's effect on heart rate - **Diltiazem**: A calcium channel blocker that reduces heart rate and has minimal reflex tachycardia. - **Amyl nitrate, Nifedipine, Minoxidil, Hydralazine**: These are potent vasodilators more likely to cause reflex tachycardia due to significant blood pressure reduction.

Explanation

1. Identify the mechanism of reflex tachycardia<br /> Reflex tachycardia occurs when vasodilation leads to a decrease in blood pressure, prompting the heart to beat faster to maintain cardiac output.<br /><br />2. Analyze each medication's effect on heart rate<br /> - **Diltiazem**: A calcium channel blocker that reduces heart rate and has minimal reflex tachycardia.<br /> - **Amyl nitrate, Nifedipine, Minoxidil, Hydralazine**: These are potent vasodilators more likely to cause reflex tachycardia due to significant blood pressure reduction.
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