What is the medication of choice for managing an aortic dissection?

• A. Metoprolol
• B. Atenolol
• C. Labetalol
• D. Propranolol

Answer: (C)

For the management of an aortic dissection, labetalol is preferred due to its unique properties as a non-selective beta-adrenergic blocker and alpha-1 adrenergic antagonist. This dual action allows labetalol to effectively reduce both heart rate and systemic vascular resistance, which are critical in managing the blood pressure and thus reducing the stress on the aortic wall during an acute dissection.

The primary goals in treating aortic dissection include immediate control of blood pressure and heart rate to prevent further tearing of the aorta. Labetalol's ability to quickly lower blood pressure while maintaining adequate cardiac output makes it ideal for this emergent situation. Its administration can be done intravenously for rapid effect, which is often necessary in acute cases.

The other medications also have their use in hypertension management but do not offer the same combination of effects. For example, metoprolol and atenolol primarily affect heart rate and have limited peripheral vasodilatory effects, which can be inadequate for the urgent needs of a dissection. Propranolol, while effective at reducing heart rate, does not have the vasodilatory properties necessary to manage the acute setting, making it less suitable compared to labetalol.

In summary,