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Aortic augmentation index in patients with peripheral arterial disease.
Journal of Clinical Hypertension 2014 November
Aortic augmentation index (AIx) is used to investigate arterial stiffness. The authors tested the hypothesis that patients with peripheral arterial disease (PAD) demonstrate a higher AIx and also evaluated several related factors. In 97 patients with PAD, identified by ankle-brachial pressure index (ABPI ≤ 0.9), and 97 controls (ABPI ≥ 0.91< 1.4), AIx (%) was determined using tonometry of the radial artery. There was no significant difference between patients and controls in characteristics of age, sex, height, diastolic blood pressure, mean blood pressure, and heart rate. AIx was higher in patients with PAD (32 ± 9 vs 28 ± 9; P = .001). In multivariate regression analysis, AIx was independently associated with heart rate (β = -0.40, P = .0005). This study showed that AIx increased in patients with PAD and that heart rate is a determinant of AIx. Further studies are necessary to assess the pathophysiological and clinical importance of AIx in patients with PAD.
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