The Value of Screening in Siblings of Patients with Abdominal Aortic Aneurysm

AbstractObjectives. This study aimed to determine the incidence of abdominal aortic aneurysm (AAA) in a large group of siblings of Australian AAA patients to determine if screening in this group is justified.Methods. 1254 siblings of 400 index AAA patients were identified and offered aortic ultrasound screening. An age and sex matched control group was recruited from patients having abdominal CT scans for non-vascular indications. AAA was defined by an infrarenal aortic diameter of ≥3 cm or a ratio of the infrarenal to suprarenal aortic diameter of ≥2.0. A ratio of 1.0–1.5 was considered normal, and a ratio of >1.5 to