Abdominal aortic aneurysm is operated when the size is more than:
**Question:** Abdominal aortic aneurysm is operated when the size is more than:
A. 5 cm
B. 6 cm
C. 8 cm
D. 10 cm
**Core Concept:** Abdominal aortic aneurysms (AAA) are localized dilations (>50% increase in diameter) of the infrarenal portion of the abdominal aorta, often caused by degenerative changes, atherosclerosis, or genetic factors. When aneurysms reach a certain size, they become a significant risk for rupture, leading to life-threatening hemorrhage.
**Why the Correct Answer is Right:** The correct answer is **D** 10 cm, as it is generally agreed upon that an abdominal aortic aneurysm should be considered for surgical repair once its diameter surpasses 10 cm. Aneurysms larger than 10 cm have a significantly increased risk of rupture, leading to high mortality rates (up to 80%).
**Why Each Wrong Option is Incorrect:**
A. 5 cm: This size is too small, as AAAs are typically asymptomatic at this stage and may not require immediate surgical intervention. However, close monitoring should be continued.
B. 6 cm: Though abdominal aortic aneurysms larger than 6 cm are considered for surveillance, the surgical intervention is usually warranted when the diameter exceeds 10 cm.
C. 8 cm: This size is too small compared to the recommended threshold for surgical intervention.
**Why Each Wrong Option is Incorrect:**
A. 5 cm: This size is too small, as AAAs are typically asymptomatic at this stage and may not require immediate surgical intervention. However, close monitoring should be continued.
B. 6 cm: Though abdominal aortic aneurysms larger than 6 cm are considered for surveillance, the surgical intervention is usually warranted when the diameter exceeds 10 cm.
C. 8 cm: This size is too small compared to the recommended threshold for surgical intervention.
**Clinical Pearl:** In clinical practice, a judicious management strategy for abdominal aortic aneurysms involves close monitoring for smaller aneurysms (<6 cm) and intervention when the diameter surpasses 10 cm. However, individual cases should be evaluated considering various factors like patient age, sex, smoking history, and the presence of symptoms or signs of impending rupture (e.g., abdominal or back pain, rapid growth rate, or pulsatile abdominal mass).