Which medication is commonly used to control heart rate in aortic dissection?

Which medication is commonly used to control heart rate in aortic dissection?

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

Answer: (A)

In aortic dissection, the immediate goal is to minimize shear stress on the aorta by quickly lowering heart rate and blood pressure. A medication that is commonly used to control heart rate is an IV beta-blocker with additional alpha-blockade effects. Labetalol fits this role well because it blocks beta receptors to reduce heart rate and contractility, and also blocks alpha receptors to help lower systemic vascular resistance. This dual action lowers both heart rate and blood pressure rapidly, reducing dP/dt and the stress on the torn aortic wall. Other vasodilators, such as nitroprusside, nicardipine, and hydralazine, can effectively lower blood pressure but may cause reflex tachycardia, which can increase shear forces on the aorta. They are often used after heart rate control has been achieved or in combination with a beta-blocker, rather than as the sole agent for rate control.

In aortic dissection, the immediate goal is to minimize shear stress on the aorta by quickly lowering heart rate and blood pressure. A medication that is commonly used to control heart rate is an IV beta-blocker with additional alpha-blockade effects. Labetalol fits this role well because it blocks beta receptors to reduce heart rate and contractility, and also blocks alpha receptors to help lower systemic vascular resistance. This dual action lowers both heart rate and blood pressure rapidly, reducing dP/dt and the stress on the torn aortic wall.

Other vasodilators, such as nitroprusside, nicardipine, and hydralazine, can effectively lower blood pressure but may cause reflex tachycardia, which can increase shear forces on the aorta. They are often used after heart rate control has been achieved or in combination with a beta-blocker, rather than as the sole agent for rate control.