Which agent is a direct-acting vasodilator commonly used to reduce afterload in aortic dissection management?

Which agent is a direct-acting vasodilator commonly used to reduce afterload in aortic dissection management?

• A. Nitroprusside
• B. Labetalol
• C. Nicardipine
• D. Hydralazine

Answer: (A)

Rapid reduction of afterload is crucial in aortic dissection to lower the force driving blood through the false lumen and to minimize propagation of the tear. Nitroprusside is a direct-acting vasodilator that acts quickly on both arteries and veins, producing a rapid drop in systemic vascular resistance and blood pressure. This fast, titratable effect allows tight control of the target BP (and, with a beta-blocker to blunt reflex tachycardia, helps prevent increased shear stress from a compensatory heartbeat). Because of its immediate onset and short duration, nitroprusside is the preferred agent for acute afterload reduction in dissection management. Other options either don’t provide as rapid or controllable afterload reduction, or carry more drawbacks in this setting (for example, beta-blockade-focused drugs lower BP without the same direct vasodilatory effect, and hydralazine can cause reflex tachycardia and less precise control).

Rapid reduction of afterload is crucial in aortic dissection to lower the force driving blood through the false lumen and to minimize propagation of the tear. Nitroprusside is a direct-acting vasodilator that acts quickly on both arteries and veins, producing a rapid drop in systemic vascular resistance and blood pressure. This fast, titratable effect allows tight control of the target BP (and, with a beta-blocker to blunt reflex tachycardia, helps prevent increased shear stress from a compensatory heartbeat). Because of its immediate onset and short duration, nitroprusside is the preferred agent for acute afterload reduction in dissection management. Other options either don’t provide as rapid or controllable afterload reduction, or carry more drawbacks in this setting (for example, beta-blockade-focused drugs lower BP without the same direct vasodilatory effect, and hydralazine can cause reflex tachycardia and less precise control).