Familial abdominal aortic aneurysm

Familial abdominal aortic aneurysm (familial AAA) is a condition characterized by the abnormal dilation or ballooning of the abdominal portion of the aorta, the largest blood vessel in the body, occurring with a clear familial clustering. Unlike sporadic abdominal aortic aneurysms, this form is defined by the presence of the condition in multiple members of the same family, suggesting a significant genetic contribution to disease susceptibility. The condition primarily affects the cardiovascular system, specifically the infrarenal segment of the abdominal aorta, where progressive weakening and expansion of the vessel wall can occur over years. The major clinical concern with familial AAA is the risk of aortic rupture, which is a life-threatening emergency associated with high mortality. Many patients remain asymptomatic until the aneurysm reaches a critical size or ruptures, at which point symptoms may include sudden severe abdominal or back pain, hypotension, and shock. Some patients may experience chronic abdominal or back discomfort as the aneurysm enlarges. Compared to sporadic cases, familial AAA tends to present at a younger age and may have a higher rupture rate. Risk factors that compound genetic susceptibility include smoking, hypertension, male sex, and advancing age. Management of familial AAA involves regular surveillance imaging (typically abdominal ultrasound or CT angiography) for at-risk family members, cardiovascular risk factor modification (particularly smoking cessation and blood pressure control), and surgical intervention when the aneurysm reaches a threshold diameter (generally 5.0–5.5 cm) or is rapidly expanding. Surgical options include open surgical repair and endovascular aneurysm repair (EVAR). Screening of first-degree relatives of affected individuals is strongly recommended, as the risk of AAA is significantly increased in family members. No specific pharmacological therapy has been proven to prevent aneurysm growth, though statins and antihypertensive agents are commonly used to manage associated cardiovascular risk.

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