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      Osmoregulation of Plasma Vasopressin in Three Cases with Adrenal Insufficiency of Diverse Etiologies

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          Abstract

          Neurohypophyseal function was studied by hypertonic saline infusion with plasma vasopressin measurement in 3 patients with adrenal insufficiency before and after cortisol replacement. Although each patient had different causes of adrenal insufficiency, all showed impaired water excretion before replacement. The first patient with isolated adrenocorticotropin deficiency had marked hyponatremia and inappropriate vasopressin secretion which was normalized after replacement, indicating vasopressin hypersecretion during hypoadrenocorticism. The second patient had combined anterior and posterior pituitary deficiency due to postpartum hypopituitarism and showed completely absent vasopressin secretion, with her polyuria being masked before cortisol replacement, suggesting a vasopressin-independent intrarenal mechanism of antidiuresis. The third patient with panhypopituitarism due to a pituitary tumor also had preexisting diabetes insipidus with defective vasopressin secretion. In this case, however, plasma vasopressin was found to be elevated when adrenal insufficiency and hyponatremia subsequently developed. Together, these results indicate that vasopressin hypersecretion does occur during adrenal insufficiency, but that the accompanying urinary diluting defect may be attributable either to vasopressin-dependent or to vasopressin-independent mechanisms.

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          Author and article information

          Journal
          HRE
          Horm Res Paediatr
          10.1159/issn.1663-2818
          Hormone Research in Paediatrics
          S. Karger AG
          1663-2818
          1663-2826
          1997
          1997
          09 December 2008
          : 47
          : 1
          : 38-44
          Affiliations
          aFirst Department of Internal Medicine, Nagoya University School of Medicine, Nagoya, and bDepartment of Internal Medicine, Japanese Red Cross Nagoya First Hospital, Nagoya, Japan
          Article
          185368 Horm Res 1997;47:38–44
          10.1159/000185368
          9010716
          © 1997 S. Karger AG, Basel

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          Page count
          Pages: 7
          Categories
          Case Report

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