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• W1988218548 abstract "PURPOSE: In the differential diagnosis of patients with polyuria-polydipsia one must distinguish usually between primary polydipsia (PP) and central diabetes insipidus (CDI). The first situation is a state of volume expansion and the second of volume contraction. We evaluate whether serum uric acid determination could help to differentiate between the two conditions.PATIENTS AND METHODS: We analyzed the score of 13 consecutive patients with CDI, 7 patients with PP, and 7 patients with nephrogenic diabetes insipidus (NDI). Serum uric acid concentration was available during normonatremia without treatment with 1-desamino-8-D-arginine vasopressin (dDAVP), during mild dehydration and during treatment with dDAVP. In 8 of these patients plasma renin activity (PRA), urate, urea and creatinine clearances were also available. These data were also obtained in the patients with NDI. In 1 patient with CDI, we studied the effect on urate clearance of dDAVP, which stimulates exclusively the V2 receptors, and of triglycyl-lysine-vasopressin (TGLV), a potent V1-receptor agonist.RESULTS: Normonatremic polydypsic patients with CDI presented an increase in uric acid concentration (7.1 ± 2.2 mg/dL), whereas in the PP group the value was decreased (3 ± 0.75 mg/dL; P <0.001). All the normonatremic PP presented a serum uric acid concentration lower than 5 mg/dL, whereas all the normonatremic CDI patients, exept 1, presented a value higher than 5 mg/dL. In both groups blood urea concentration was decreased as a consequence of high renal clearances. The hyperuricemia of CDI was related to low uric acid clearances. Patients with hypernatremia and NDI presented a lower increase in serum uric acid concentration than those with similar levels of hypernatremia and CDI (NDI: 5.7 ± 0.8 mg/dL and CDI: 7.9 ± 2.3 mg/dL; P <0.05) and the NDI patients presented an urate clearance corrected for creatinine clearance which was significantly higher than in CDI (9% ± 3% and 4% ± 1.1%; P <0.01). When the patients with CDI were treated with dDAVP and normalyzed their PRA (0.9 ± 0.4 ng/mL/h) we observed still mild hyperuricemia compared to controls (5.5 ± 1.4 mg/dL and 4.3 ± 0.9 mg/dL; P <0.01) and a low fractional excretion of filtered uric acid (6.5% ± 1.7% compared to 8.2% ± 2% in controls; P <0.05). Acute administration of dDAVP, stimulating the V2 receptors, in one patient with CDI, had no effect on urate clerance, while TGLV, which stimulates the V1 receptor, increased urate clearance.CONCLUSION: The presence of an serum uric acid concentration higher than 5 mg/dL in polyuric polydipsic patients is highly suggestive of CDI. Even when these patients are treated with dDAVP many of them remain hyperuricemic, and this seems to be the consequence of a lack of V1 receptor stimulation." @default.
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• W1988218548 date "1995-04-01" @default.
• W1988218548 modified "2023-09-26" @default.
• W1988218548 title "Heightened vasopressin secretion following psychotic exacerbations in polydipsic schizophrenic patients with hyponatremia" @default.
• W1988218548 doi "https://doi.org/10.1016/0920-9964(95)95185-c" @default.
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