To blunt tachycardia and reduce shear during afterload reduction, which drug is used?

• A. Nifedipine
• B. Esmolol
• C. Hydralazine
• D. Nitroprusside

Answer: (B)

When you lower afterload with vasodilators, the body often compensates with reflex tachycardia, which increases myocardial oxygen demand and can raise shear forces on the vessels. The drug that best handles this by both dampening the heart rate and letting afterload-reducing therapy work is a short-acting beta-1 blocker. Esmolol is ideal because it’s given IV, acts quickly to slow the heart rate and reduce contractility, and its effects wear off rapidly, allowing precise titration. This means you can achieve the desired afterload reduction while keeping the heart rate in check, improving diastolic filling and reducing myocardial stress. Other vasodilators can lower afterload but tend to cause reflex tachycardia, so they don’t address the tachycardia issue directly as effectively as esmolol.