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Hypertension and diabetes are associated with an increased arterial stiffness. A direct blood pressure-independent effect of angiotensin-converting enzyme inhibitors on arterial stiffness has never been unequivocally demonstrated. In this mechanistic study, we used an experimental design in which patients responding to 1 month treatment with 4 mg perindopril were randomized double-blind to either 4 mg perindopril or 8 mg perindopril for 6 months. We determined carotid distensibility with echotracking and applanation tonometry at baseline and after the 7-month treatment period in 57 essential hypertensive patients with type 2 diabetes (age 63+/-7 years). We monitored ambulatory blood pressure at baseline and after treatment. After 7 months treatment, 24-hour ambulatory blood pressure significantly decreased, with no significant difference between 4 mg and 8 mg perindopril. Carotid distensibility increased more after 8 mg perindopril compared with 4 mg perindopril (8 mg: from 13.1+/-5.9 to 16.0+/-6.7 kPa(-1)x10(-3); 4 mg: from 13.2+/-5.2 to 12.7+/-5.9 kPa(-1)x10(-3); ANOVA, dose-period interaction, P&lt;0.05). Carotid internal diameter and elastic modulus were significantly lower after 8 mg perindopril compared with 4 mg perindopril, independent of blood pressure reduction. These results indicate a dose-dependent and blood pressure-independent reduction in carotid stiffness under chronic treatment with an angiotensin-converting enzyme inhibitor. They suggest that arterial distensibility was increased through an inward remodeling, leading to a reduction in wall stress, thus reducing elastic modulus. They also suggest that long-term administration of high doses (8 mg) of perindopril is required to improve carotid structure and function in hypertensive patients with type 2 diabetes.

Brachial Pressure–Independent Reduction in Carotid Stiffness After Long-Term Angiotensin-Converting Enzyme Inhibition in Diabetic Hypertensives