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(Hypertension. 1995;26:937-941.)
© 1995 American Heart Association, Inc.

Articles

Contrasting Effect of Antihypertensive Treatment on the Renal Response to L-Arginine

Albert Mimran; Jean Ribstein; Guilhem DuCailar

From the Department of Medicine, Centre Hospitalier Universitaire, Montpellier, France.

Correspondence to Albert Mimran, Hôpital Lapeyronie, 34295 Montpellier cedex 5, France.

Abstract We assessed the renal hemodynamic response to L-arginine infusion (30 g within 60 minutes) in normotensive subjects, patients with never-treated essential hypertension, and hypertensive patients controlled by long-term (more than 2 years) treatment with or without an angiotensin-converting enzyme inhibitor. The renal vasodilator response to L-arginine observed in normotensive subjects (15±4% increase in effective renal plasma flow) was abolished in untreated hypertensive patients and restored only in the group treated by angiotensin-converting enzyme inhibition. In the whole population a positive correlation between the change in effective renal plasma flow and the change in urinary cGMP was obtained. It is suggested that abnormalities of the renal nitric oxide pathway not corrected by increased availability of L-arginine and reversible only on long-term treatment by angiotensin-converting enzyme inhibition may underlie the abnormal renal resistance observed in essential hypertension.

Key Words: hypertension, essential • renal circulation • arginine • angiotensin-converting enzyme inhibitors

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