Which statement explains why acute aortic dissection is an absolute contraindication?

Which statement explains why acute aortic dissection is an absolute contraindication?

• A. It is irrelevant to blood pressure
• B. It has no risk during exercise
• C. Exercise could extend the dissection or cause rupture due to increased shear stress
• D. It resolves with rest

Answer: (C)

Acute aortic dissection means the aorta has a tear and a fragile flap that can be easily forced to propagate. Exercise raises heart rate and systolic blood pressure, which increases shear stress on the aortic wall. That extra stress can cause the dissection to extend or the wall to rupture, a life-threatening event. Because of this risk, any exertion is avoided in the acute phase while stabilization and BP/HR control are achieved. Other statements that downplay this risk ignore how powerful changes in pressure and flow are in a weakened aorta.

Acute aortic dissection means the aorta has a tear and a fragile flap that can be easily forced to propagate. Exercise raises heart rate and systolic blood pressure, which increases shear stress on the aortic wall. That extra stress can cause the dissection to extend or the wall to rupture, a life-threatening event. Because of this risk, any exertion is avoided in the acute phase while stabilization and BP/HR control are achieved. Other statements that downplay this risk ignore how powerful changes in pressure and flow are in a weakened aorta.