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Hyperreninemia and Hypoaldosteronism in a Child With Short Stature

Ashraf, Ambika MD; McCormick, Kenneth MD

Case Report
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We report a child with primary renal tubular alkalosis who had hypokalemia, profound hyperreninemia, and hypoaldosteronism. A 14-year-old girl presented with short stature and delayed puberty. Laboratory evaluation disclosed hypokalemia, hypochloremia, hypomagnesemia, alkalosis, hypocalciuria, and a markedly elevated rennin at 2859 ng/mL/h and a suppressed aldosterone at 2.5 ng/dL. Subsequently, as the serum potassium normalized, renin levels gradually declined (16.78 ng/mL/h) and, despite this renin reduction, aldosterone levels progressively increased (61.7 ng/dL). The patient's clinical course highlights the preeminent role of potassium, as a direct regulator of aldosterone synthesis, versus the indirect action of renin. This observation suggests potassium is by and large a major regulator of aldosterone synthesis in renal salt-wasting disorders.

From the Department of Pediatric Endocrinology, Children's Hospital, UAB, Birmingham, Alabama.

Reprints: Ambika Ashraf, MD, 1600, ACC Suite 608, Seventh Avenue South, Children's Hospital, UAB, Birmingham, AL 35233. E-mail: AAshraf@peds.uab.edu.

© 2004 Lippincott Williams & Wilkins, Inc.