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OBJECTIVE: To determine the prevalence of syndrome of inappropriate antidiuretic hormone secretion (SIADH) among older hyponatremic patients in a subacute geriatric facility, to identify patients with no apparent cause for the SIADH (idiopathic SIADH), and to determine their clinical characteristics.
The causes of SIADH can be divided into four broad categories: nervous system disorders, neoplasia, pulmonary diseases, and drug induced (which include those that [1] stimulate AVP release, [2] potentiate effects of AVP action, or [3] have an uncertain mechanism).