Abstract
Observations are presented on two patients with chronic compulsive polydipsia who showed a relative defect in renal concentrating capacity. After excluding all possible metabolic and renal causes of hyposthenuria and after obtaining normal kidney biopsies, both patients were studied in metabolic balance on a constant diet under the following conditions: (a) dehydration (loss of 3-5% body weight), (b) water loading and response to hypertonic saline, and (c) water loading and response to intravenous vasopressin (Pitressin). Throughout these studies the following parameters were observed: plasma and urine osmolality, glomerular filtration rate (inulin), renal plasma flow (P.A.H.), osmolar clearance and clearance of free water. In both patients the concentration defect was not related to variations in glomerular filtration rate or osmotic load. There was no correlation between the degree of hypoosmolality and the renal concentrating defect. Contrary to reports from other laboratories, restriction of water intake and chronic administration of intramuscular vasopressin did not correct the concentration defect.
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Selected References
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