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A double-blind, randomized crossover study was performed in 21 patients with essential arterial hypertension. Nitrendipine 20 mg o.d. and lisinopril 20 mg o.d. were given in a randomized order during a period of each 8 weeks. Nitrendipine and lisinopril decreased systolic and mean arterial blood pressure to a similar level without a significant increase in heart rate. The mean diastolic blood pressure was smaller with the lisinopril treatment than with the nitrendipine treatment. The blood pressure decrease was maintained in the sitting and standing position. Furthermore, only nitrendipine decreased the pulsatility index at the tibial posterior arteries, while lisinopril did not influence it significantly. This finding means that mechanisms other than the blood-pressure lowering effect are involved in the decrease of the pulsatility index.

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