CASE REPORTS
JOURNAL ARTICLE
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Recumbent cranial diabetes insipidus. Studies in a patient with adipsia, hypernatremia, poikilothermia and polyphagia.

A male, aged 16, with chronic hypernatremia, adipsia, polyphagia, and poikilothermia was studied regarding regulation and secretion of arginine vasopressin. During recumbency at night, low plasma arginine vasopressin levels and increased volumes of dilute urine were found; whereas plasma arginine vasopressin levels and urine osmolalities rose and urine volumes decreased during ambulation in the daytime. Neither a 25% reduction of mean arterial pressure nor hypertonic saline infusion increased plasma arginine vasopressin or urine osmolalities. Treatment with 1-desamino-D-arginine-vasopressin at 6 p.m. and a scheduled fluid intake according to actual body weight eradicated hypernatremia and hyperosmolality. These data demonstrate a complete loss of arginine vasopressin secretion to osmotic stimulation, a partial defect of arginine vasopressin secretion to non-osmotic stimulation, an abolished response to stimulation of high-pressure-baroreceptors, but an intact responsiveness to stimulation of low-pressure-baroreceptors.

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