Extrarenal Factors in Diabetes Insipidus in the Rat

Abstract
Using inulin as indicator of the extracellular volume, the distribution of sodium, potassium and water was studied in rats with diabetes insipidus produced by interrruption of the supraoptico-hypophyseal tract. A well defined increase in the extracellular fluid volume associated with normal plasma sodium and reduced plasma potassium concentration was uniformly present in the rats with diabetes insipidus. These changes occurred in nephrectomized animals and were thus independent of renal function, but were in some degree referable to an increase in adrenal function since they could be partially reversed by adrenal ablation.

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