Which agent is commonly used in combination with esmolol to achieve blood pressure reduction in an acute aortic dissection?

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

Answer: (D)

In acute aortic dissection, the goal is to rapidly lessen shear stress on the aortic wall by lowering heart rate, contractility, and afterload. Esmolol provides a quick, controlled reduction in heart rate and contractility, which directly reduces the force the blood exerts on the aorta. To achieve a fast drop in systolic blood pressure, a potent arterial vasodilator is added. Nitroprusside is the classic choice because it dilates arteries strongly and lowers afterload quickly. Using it with a beta-blocker prevents reflex tachycardia that a pure vasodilator would provoke, which could worsen dissection by increasing shear forces. The other agents either have slower onset or tend to cause reflex tachycardia or unpredictable effects in this emergency setting, making nitroprusside the best pairing with esmolol for rapid BP reduction in acute dissection.