SIADH results from a failure of the negative feedback system that regulates the release and inhibition of ADH. In persons with this syndrome, ADH secretion continues even when serum osmolality is decreased; this causes marked retention of water in excess of sodium and dilutional hyponatremia. An increase in the glomerularfiltration rate resulting from an increased plasma volumecauses further increases in sodium loss by suppressing therenin-angiotensin mechanism. Urine osmolality is high,and serum osmolality is low.
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