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Vasodilator responses to verapamil by plasma renin activity dichotomized above and below 1 ng/mL per hour. Endothelium-independent responses were assessed to the non-nitric oxide-mediated vasodilator verapamil in 20 patients with hypertension and 40 normotensive controls. Verapamil responses were preserved in both cohorts irrespective of plasma renin activity.
