Which risk factor is classically associated with thoracic aortic aneurysm?

Which risk factor is classically associated with thoracic aortic aneurysm?

• A. Hypertension
• B. Hyperlipidemia
• C. Hypotension
• D. Obesity

Answer: (A)

Chronic hypertension is the classic risk factor for thoracic aortic aneurysm. The aorta is constantly exposed to high pulsatile pressure, and long-standing elevated pressure increases wall stress. This repeated stress promotes damage to the media—elastic fiber fragmentation and smooth muscle loss—weakening the vessel wall and allowing dilation, which can progress to an aneurysm and even dissection. While obesity and hyperlipidemia raise cardiovascular risk in general, they are more closely tied to atherosclerotic disease, which affects the abdominal aorta and peripheral vessels more often than the thoracic portion. Hypotension would reduce wall stress rather than promote aneurysm formation. Other factors like connective tissue disorders or bicuspid aortic valve are important contributors in certain patients, but hypertension remains the most classically associated risk factor across the broader population.

Chronic hypertension is the classic risk factor for thoracic aortic aneurysm. The aorta is constantly exposed to high pulsatile pressure, and long-standing elevated pressure increases wall stress. This repeated stress promotes damage to the media—elastic fiber fragmentation and smooth muscle loss—weakening the vessel wall and allowing dilation, which can progress to an aneurysm and even dissection.

While obesity and hyperlipidemia raise cardiovascular risk in general, they are more closely tied to atherosclerotic disease, which affects the abdominal aorta and peripheral vessels more often than the thoracic portion. Hypotension would reduce wall stress rather than promote aneurysm formation. Other factors like connective tissue disorders or bicuspid aortic valve are important contributors in certain patients, but hypertension remains the most classically associated risk factor across the broader population.