What is the most appropriate medication to prevent worsening in a dissecting abdominal aortic aneurysm?

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Multiple Choice

What is the most appropriate medication to prevent worsening in a dissecting abdominal aortic aneurysm?

Reducing the force driving blood through the damaged aorta is the key. In a dissecting aortic aneurysm, high heart rate and elevated blood pressure increase shear stress on the weakened wall, risking propagation of the dissection or rupture. A beta-blocker lowers both heart rate and blood pressure, which decreases the rate of rise in pressure (dP/dt) and the overall wall stress. This helps limit progression of the dissection while definitive surgical or endovascular treatment is planned. In the acute setting, IV beta-blockers like esmolol or labetalol are used to target a heart rate about 60 bpm and a systolic BP around 100–120 mmHg. Calcium channel blockers can lower BP but don’t reduce shear stress as reliably, and vasopressors like norepinephrine or epinephrine would raise blood pressure and heart rate, worsening the condition.

Reducing the force driving blood through the damaged aorta is the key. In a dissecting aortic aneurysm, high heart rate and elevated blood pressure increase shear stress on the weakened wall, risking propagation of the dissection or rupture. A beta-blocker lowers both heart rate and blood pressure, which decreases the rate of rise in pressure (dP/dt) and the overall wall stress. This helps limit progression of the dissection while definitive surgical or endovascular treatment is planned. In the acute setting, IV beta-blockers like esmolol or labetalol are used to target a heart rate about 60 bpm and a systolic BP around 100–120 mmHg. Calcium channel blockers can lower BP but don’t reduce shear stress as reliably, and vasopressors like norepinephrine or epinephrine would raise blood pressure and heart rate, worsening the condition.

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