The effects of postural changes on ADH release and the renal handling of sodium and water in patient with idiopathic edema.

In order to investigate the role of ADH and the renal handling of sodium and water in patients with idiopathic edema, 21 patients were subjected to acute oral water load tests. Although a normal water diuresis was observed in al patients in supine posture, it was markedly impaired in upright posture with significant decreases in sodium, free water, and osmolar clearances. In particular, two patients exhibited the continuous production of concentrated urine after the water load in upright posture. The fractional reabsorption of sodium at the proximal tubules was significantly increased in upright posture, while the glomerular filtration rate did not change significantly. The constricting of both legs with elastic bandages tended to improve the water diuresis in upright posture, suggesting that the pooling of blood into the lower legs might be contributing to the formation of idiopathic edema. The patients showed normal osmoregulation of ADH release in supine, but not in upright posture: the suppression of ADH release in upright posture was only transient or incomplete despite a sufficient fall in plasma osmolality following the water load. Thus, both an increase in renal sodium reabsorption and the insufficient suppression of ADH release in upright posture might contribute to the retention of body fluid in patients with idiopathic edema.

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