In acute aortic dissection, which pharmacologic strategy reduces aortic wall shear stress?

Prepare for the Emergency Nursing Orientation 3.0 Cardiovascular Emergencies Test. Use interactive flashcards and detailed explanations with multiple choice questions. Enhance your understanding of cardiovascular emergencies and succeed on your exam!

Multiple Choice

In acute aortic dissection, which pharmacologic strategy reduces aortic wall shear stress?

The immediate priority in acute aortic dissection is to rapidly limit the forces that drive the dissection by lowering heart rate, contractility, and systolic pressure. An intravenous beta-blocker started right away achieves this by quickly reducing heart rate and LV contractility, which lowers the rate of pressure rise in the aorta (dP/dt) and the wall shear stress on the intimal flap. Esmolol is ideal here because its effects are fast and easily titratable, allowing precise control to reach a target heart rate with minimal ongoing risk. Using an oral beta-blocker would not provide the same rapid, controllable effect in an emergent setting. A vasopressor would raise blood pressure and worsen shear forces, and an oral calcium channel blocker lacks the rapid, titratable action needed in the acute phase. After HR control, additional measures can be used to optimize BP, but the best initial strategy to reduce wall shear stress is immediate IV beta-blockade.

The immediate priority in acute aortic dissection is to rapidly limit the forces that drive the dissection by lowering heart rate, contractility, and systolic pressure. An intravenous beta-blocker started right away achieves this by quickly reducing heart rate and LV contractility, which lowers the rate of pressure rise in the aorta (dP/dt) and the wall shear stress on the intimal flap. Esmolol is ideal here because its effects are fast and easily titratable, allowing precise control to reach a target heart rate with minimal ongoing risk. Using an oral beta-blocker would not provide the same rapid, controllable effect in an emergent setting. A vasopressor would raise blood pressure and worsen shear forces, and an oral calcium channel blocker lacks the rapid, titratable action needed in the acute phase. After HR control, additional measures can be used to optimize BP, but the best initial strategy to reduce wall shear stress is immediate IV beta-blockade.

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