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The Journal of Clinical Endocrinology & Metabolism Vol. 85, No. 5 1863-1867
Copyright © 2000 by The Endocrine Society

Original Studies

Primary Hyperaldosteronism in Essential Hypertensives: Prevalence, Biochemical Profile, and Molecular Biology1

Carlos E. Fardella, Lorena Mosso, Celso Gómez-Sánchez, Paola Cortés, Julia Soto, Luis Gómez, Mauricio Pinto, Alvaro Huete, Eveline Oestreicher, A. Foradori and JoaquÍn Montero

Departments of Endocrinology (C.E.F., L.M., P.C., L.G., M.P., E.O.), Internal Medicine (J.M.), Radiology (A.H.), and The Associated Unit of Clinical Laboratories (J.S., A.F.), Faculty of Medicine, Catholic University of Chile, Marcoleta 391, Santiago, Chile; and Endocrine Section (C.G.-S.), Harry S. Truman Memorial Hospital, Department of Internal Medicine, Columbia, Missouri 65201-5297

Address correspondence and requests for reprints to: Carlos E. Fardella, Department of Endocrinology, Faculty of Medicine, P. Universidad Católica de Chile, Marcoleta 391, Santiago, Chile.

There is evidence that primary aldosteronism (PA) may be common in patients with essential hypertension (EH) when determinations of serum aldosterone (SA), plasma renin activity (PRA), and the SA/PRA ratio are used as screening. An inherited form of primary hyperaldosteronism is the glucocorticoid-remediable aldosteronism (GRA) caused by an unequal crossing over between the CYP11B1 and CYP11B2 genes that results in a chimeric gene, which has aldosterone synthase activity regulated by ACTH. The aim of this study was to evaluate the prevalence of PA and the GRA in 305 EH patients and 205 normotensive controls. We measured SA (1–16 ng/dL) and PRA (1–2.5 ng/mL·h) and calculated the SA/PRA ratio in all patients. A SA/PRA ratio level greater than 25 was defined as being elevated. PA was diagnosed in the presence of high SA levels (>16 ng/dL), low PRA levels (<0.5 ng/mL·h), and very high SA/PRA ratio (>50). Probable PA was diagnosed when the SA/PRA ratio was more than 25 but the other criteria were not present. A Fludrocortisone test was done to confirm the diagnosis. GRA was differentiated from other forms of PA by: the aldosterone suppression test with dexamethasone, the high levels of 18-hydroxycortisol, and the genetic detection of the chimeric gene. In EH patients, 29 of 305 (9.5%) had PA, 13 of 29 met all the criteria for PA, and 16 of 29 were initially diagnosed as having a probable PA and confirmed by the fludrocortisone test. Plasma potassium was normal in all patients. The dexamethasone suppression test was positive for GRA in 10 of 29 and 18-hydroxycortisol levels were high in 2 of 29 patients who had also a chimeric gene. In normotensive subjects, 3 of 205 (1.46%) had PA, and 1 of 205 had a GRA. In summary, we found a high frequency of normokalemic PA in EH patients. A high proportion of PA suppressed SA with dexamethasone, but only a few had a chimeric gene or high levels of 18-hydroxycortisol. These results emphasize the need to further investigate EH patients.




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