Studies indicate that there is a familial, genetic incidence of abdominal aortic aneurysms. Screening of siblings older than 50 years of age of patients with aneurysms revealed an occult aneurysm in approximately 30% of brothers and less than 10% of sisters. The prevalence of abdominal aortic aneurysms (3–6 cm) is approximately 3 and 5% in individuals older than 55 and 65, respectively. The prevalence among men is about five times that among women. Studies suggest that one-time ultrasound screening of men at age 65 is sufficient to identify nearly all those who are at risk. At this age men who have aortic diameters less than 2.6 cm are all expected to be free from significant aneurysm (less than 4 cm) 12 years later.

B. Signs and Symptoms
The occurrence of abdominal aortic aneurysms is common in men over age 55 and in women after age 70. Aneurysms may grow to more than 5 cm without causing symptoms and may go unnoticed by the individual. Abdominal aortic aneurysms, however, are not always asymptomatic. Back pain, abdominal pain, and particularly intermittent clau-dication in men greater than age 65 may be the clue to the presence of an abdominal aortic aneurysm. Selective screening for aneurysms in patients with intermittent claudication nearly doubles the yield over screening in the general population.

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