For a patient with an acute type A aortic dissection, what is the FIRST pharmacologic priority in management?

• A. Reducing heart rate
• B. Reducing the blood pressure
• C. Controlling pain
• D. Administering TXA

Answer: (B)

The key idea is to minimize the stress on the torn aorta as quickly as possible. In an acute type A dissection, high systolic blood pressure drives the force of blood against the damaged wall, promoting propagation of the dissection and risking rupture. Rapidly lowering the systolic pressure reduces this wall stress and helps stabilize the situation while definitive surgical repair is arranged. In practice, this is achieved immediately with IV antihypertensives to bring the BP down toward a target around 100–120 mmHg, sometimes using a beta-blocker first to blunt heart rate and contractility, then adding a vasodilator if more BP reduction is needed. Pain control and TXA do have roles in care, but they do not address the primary danger as effectively as promptly reducing blood pressure does.