Long-term central hemodynamic effects at rest and during exercise of losartan in essential hypertension

Abstract

Background Losartan reduces blood pressure in patients with essential hypertension, but the long-term central hemodynamic effects at rest and during exercise are not known. Methods and Results After 8 months of losartan treatment (50 to 100 mg daily, mean 82 mg), intra-arterial pressure was reduced from 165/102 mm Hg to 145/91 mm Hg at rest and from 193/104 mm Hg to 179/96 mm Hg during 100 W exercise in 28 patients with essential hypertension. Cardiac index and heart rate remained unchanged, but total peripheral resistance index was reduced 12% to 15%. Stroke index was unchanged at rest but increased 7% to 9% during exercise. Twenty-four-hour ambulatory blood pressure was reduced 10% to 13%. Left ventricular mass was reduced 27% in patients with left ventricular hypertrophy (n = 18). Conclusion Losartan lowers blood pressure by reducing total peripheral resistance at rest and during exercise but cardiac pump function is unchanged or slightly improved. In patients with left ventricular hypertrophy, losartan induces a sizeable reduction in left ventricular mass. (Am Heart J 2000;140:624-30.)