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(Hypertension. 1999;33:90-95.)
© 1999 American Heart Association, Inc.

Scientific Contributions

Renal Characteristics and Effect of Angiotensin Suppression in Oral Contraceptive Users

Jean Ribstein; Jean-Michel Halimi; Guilhem du Cailar; Albert Mimran

From the Department of Medicine, Hôpital Lapeyronie, Montpellier, France.

Correspondence to Jean Ribstein, MD, Department of Medicine, Hôpital Lapeyronie, 34295 Montpellier, Cedex 5, France.

Abstract—The determinants of the increase in arterial blood pressure associated with the use of estrogen-progestogen oral contraceptives (OC) remain poorly known. The purpose of this study was to assess the renal characteristics and the role of the renin-angiotensin system in women with OC-associated hypertension. Urinary clearances of technetium-labeled diethylene triaminopentaacetic acid (glomerular filtration rate) and ¹³¹I-ortho iodohippurate (effective renal plasma flow) were estimated before and after acute administration of captopril in 38 women who became hypertensive while taking OC, 38 non-OC users with essential hypertension matched for age, body mass index, and level of blood pressure, and 38 normotensive women (19 with and 19 without OC). Plasma renin activity was higher in OC hypertensives when compared with those with essential hypertension, but captopril-induced changes in blood pressure and renal hemodynamics and function were similar in both groups. In addition, 24-hours urinary albumin excretion was increased in OC users when compared with nonusers with similar arterial blood pressure. In 13 hypertensive women followed up for 6 months after OC withdrawal, a decrease in plasma renin activity, blood pressure, and glomerular filtration rate but no significant change in urinary albumin excretion and captopril-induced changes in blood pressure and renal hemodynamics were observed. These results indicate that the use of OC is associated with an increased albuminuria and no evidence of a prominent role for the renin-angiotensin system in the maintenance of high blood pressure and renal hemodynamics when compared with non-OC users with essential hypertension.

Key Words: oral contraceptives • hypertension, essential • microalbuminuria • renal hemodynamics • angiotensin-converting enzyme inhibition

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