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Carotid augmentation index (AI) is used as a surrogate measure of arterial stiffness. Although arterial stiffness has been shown to either remain unchanged or increase with an increase in heart rate, AI decreases as heart rate increases. This study aimed to quantify this confounding effect of heart rate on AI.We investigated 873 hypertensives, mean age 72 +/- 5 years, 44% men, mean brachial blood...
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