DISTENSIBILITY OF THE ASCENDING AORTA - COMPARISON OF INVASIVE AND NONINVASIVE TECHNIQUES IN HEALTHY-MEN AND IN MEN WITH CORONARY-ARTERY DISEASE

Distensibility of the ascending aorta, measured non-invasively, was compared with values obtained by invasive techniques in 46 males (30 patients with coronary artery disease and 16 age-matched normal subjects). Aortic diameters were measured at a level 3 cm above the aortic valve using both echocardiographic and angiographic techniques. Aortic distensibility was calculated from the aortic diameters and aortic pressure or brachial artery pressure using the formula: 2 × (change in aortic diameter)/(diastolic aortic diameter) × (change in aortic pressure). Distensibility of the ascending aorta determined non-invasively was closely related to that obtained by direct measurements (r = 0.949, P<0.001). Patients with coronary artery disease had similar pressures, but markedly lower distensibility than normal subjects, as shown by both invasive and non-invasive techniques. The results indicate that aortic distensibility in patients with coronary artery disease can be obtained non-invasively with a high degree of accuracy. © 1990 The European Society of Cardiology.