OBJECTIVES: Literature on the expansion rate of infrarenal aortic aneurysm is scant. This review was carried out to assess whether there is a normal rate of expansion for infrarenal aortic aneurysms. DESIGN AND METHODS: Review of literature relating to abdominal aortic aneurysm (AAA) measurement and expansion rates. Articles were identified from a search of the computerised Medline database from 1966 onwards. RESULTS: Nine studies produced expansion rates for 3.0-5.0 cm AAA ranging from 0.17 to 0.57 cm per year. Evaluation of these studies showed that they are not wholly comparable in terms of source population, sample size, disease definition and period of assessment. CONCLUSIONS: It is not possible to discuss with confidence the "normal" expansion rate of infrarenal aortic aneurysms at any diameter. To elucidate fully the behaviour of AAA, a clear and universal definition of AAA is required in order that it may be used within a large, multicentered prospective cohort study.
OBJECTIVES: Literature on the expansion rate of infrarenal aortic aneurysm is scant. This review was carried out to assess whether there is a normal rate of expansion for infrarenal aortic aneurysms. DESIGN AND METHODS: Review of literature relating to abdominal aortic aneurysm (AAA) measurement and expansion rates. Articles were identified from a search of the computerised Medline database from 1966 onwards. RESULTS: Nine studies produced expansion rates for 3.0-5.0 cm AAA ranging from 0.17 to 0.57 cm per year. Evaluation of these studies showed that they are not wholly comparable in terms of source population, sample size, disease definition and period of assessment. CONCLUSIONS: It is not possible to discuss with confidence the "normal" expansion rate of infrarenal aortic aneurysms at any diameter. To elucidate fully the behaviour of AAA, a clear and universal definition of AAA is required in order that it may be used within a large, multicentered prospective cohort study.