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Journal of Clinical Endocrinology & Metabolism, Vol 57, 388-392, Copyright © 1983 by Endocrine Society

ARTICLES

Differing effects of metoclopramide and adrenocorticotropin on plasma aldosterone levels in glucocorticoid-suppressible hyperaldosteronism and other forms of hyperaldosteronism

A Ganguly, JH Pratt, MH Weinberger, CE Grim and NS Fineberg

To investigate possible dopaminergic effects on aldosterone production, we administered the dopamine antagonist metoclopramide to 11 normal subjects, 8 patients with primary aldosteronism due to adenoma or hyperplasia, and 5 other patients with the glucocorticoid-suppressible form of hyperaldosteronism (GSH). All subjects except for those with GSH responded to metoclopramide with an increase in plasma aldosterone concentration even when endogenous ACTH was suppressed by dexamethasone pretreatment. This increase occurred without apparent mediation of other recognized stimuli for aldosterone secretion. In contrast, the patients with GSH failed to show any aldosterone response while receiving dexamethasone, but demonstrated a rise in plasma aldosterone concentration when dexamethasone was withheld. The responses in the patients with both forms of primary aldosteronism were greater in magnitude than in the normal subjects or in the subjects with GSH when not receiving dexamethasone. These studies, while demonstrating differences between the subtypes of hyperaldosteronism in their responsiveness to metoclopramide, indicate that ACTH or some other factor may exert a permissive effect in GSH for the aldosterone response to metoclopramide. A graded infusion of ACTH revealed a greater aldosterone response in GSH compared to that in the other groups, further suggesting the importance of ACTH in this disorder.


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