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The effect of antihypertensive treatment with lisinopril (10 to 20 mg) on left ventricular mass and diastolic function was studied in 35 patients with mild to moderate hypertension. At baseline 6 and 12 months after treatment responders to lisinopril were examined by complete echo Doppler in order to measure left ventricular mass, diastolic and systolic function. Only 30 patients concluded the study follow-up. Lisinopril successfully reduced mean blood pressure (from 122±10 to 110±11 mmHg), without modification in heart rate, and left ventricular mass index (from 145 ±57 to 116±42 g . m) at month 6, with mild additional reduction at month 12. Isovolumic relaxation time was reduced but still abnormal at months 6 and 12, whereas deceleration time significantly changed only (from 230± 40 to 195±35 msec) at month 12. Our results indicate that lisinopril is more successful in reducing left ventricular mass than in improving diastolic filling. [ABSTRACT FROM PUBLISHER]