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Journal of Clinical Endocrinology & Metabolism, Vol 51, 1190-1194, Copyright © 1980 by Endocrine Society

ARTICLES

Primary aldosteronism due to unilateral adrenal hyperplasia

A Ganguly, PG Zager and JA Luetscher

A 45-yr-old man with hypertension, hypokalemia, low plasma renin, and hyperaldosteronism was studied. Plasma and urine aldosterone were consistently above normal, remaining abnormally high even on a 300-meq sodium intake. Plasma aldosterone had a marked circadian rhythm, which was correlated with plasma cortisol. Aldosterone secretion was temporarily suppressed after dexamethasone administration and was stimulated by exogenous ACTH. The effect of posture was variable in the eight studies performed, possible due to episodic secretion of aldosterone observed near the sampling times of 0800 and 1200 h. Blood from the right adrenal vein contained 50--100 times more aldosterone than the left adrenal venous samples. The right adrenal gland was excised and found to contain many microscopic subcapsular nests of clear cells. Plasma aldosterone, renin, and potassium returned to normal after surgery, and blood pressure fell to 120/75 over the next 8 months. Three years later, the patient is normotensive without drugs.


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