What size threshold for surgical repair is typically considered for an abdominal aortic aneurysm?

What size threshold for surgical repair is typically considered for an abdominal aortic aneurysm?

• A. Greater than 4 cm
• B. Greater than 5 cm
• C. Greater than 6 cm
• D. Greater than 7 cm

Answer: (B)

Rupture risk in an abdominal aortic aneurysm rises as the diameter grows, so the surgical decision weighs rupture risk against the risks of the operation. The usual threshold for elective repair in an asymptomatic patient is about 5 cm; at this size the balance tends to favor intervention to prevent rupture. Some guidelines and centers use 5.5 cm, and there are nuances for women or those with rapid growth or comorbidities, but 5 cm is the common teaching threshold. Aneurysms smaller than this, such as around 4 cm, are typically monitored with serial imaging, while much larger sizes (6–7 cm) carry higher rupture risk and prompt consideration of repair sooner, though the exact timing still depends on individual factors. If the aneurysm is enlarging rapidly or is symptomatic, repair is considered regardless of reaching a precise size.

Rupture risk in an abdominal aortic aneurysm rises as the diameter grows, so the surgical decision weighs rupture risk against the risks of the operation. The usual threshold for elective repair in an asymptomatic patient is about 5 cm; at this size the balance tends to favor intervention to prevent rupture. Some guidelines and centers use 5.5 cm, and there are nuances for women or those with rapid growth or comorbidities, but 5 cm is the common teaching threshold. Aneurysms smaller than this, such as around 4 cm, are typically monitored with serial imaging, while much larger sizes (6–7 cm) carry higher rupture risk and prompt consideration of repair sooner, though the exact timing still depends on individual factors. If the aneurysm is enlarging rapidly or is symptomatic, repair is considered regardless of reaching a precise size.