The 1.5-benzotthazepine derivative diltiazem, which blocks slow calcium channels, is an effective hypotensive agent, used for the treatment of moderate hypertension. Treatment with diltiazem alone, its dose adjusted on an individual basis, controlled arterial blood pressure in 58% of the patients. With a 240 mg daily dose, blood pressure was controlled in 12 of 52 patients; when the daily dose was increased to 360 mg, blood pressure was controlled in another 18 patients. In the remaining 22 patients, blood pressure was only controlled after captopril was added in a daily dose of at least 50 mg. The drop of arterial blood pressure was associated with falling total peripheral resistance and end diastolic blood volume, and was accompanied by an increase in left-ventricular ejection fraction and myocardial oxygen want.
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