Prevalence of Ascending Thoracic Aortic Ectasies and Aneurysms Based Upon Absolute and Individual Predicted Normal Aortic Size. A Substudy from the Population-Based Randomized Dancavas Trial

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Introduction - During the planning of a large screening trial, a lack of a clear definition of ascending thoracic aortic aneurysms (aTAA) in various relevant guidelines was exposed. Normally, an aneurysm is defined as a diameter at least 50% greater than the normal size of the artery, while a 25-49% increase is considered to be ectatic. (1) The healthy aorta is usually considered not to exceed 40 mm in diameter. (2)