Severe hyponatremia due to inappropriate antidiuretic hormone secretion – a case report

Inappropriate antidiuretic hormone secretion syndrome (SIADH) is the most common cause of normovolemic hypotonic hyponatremia in hospital settings. The article describes the case of a female patient admitted to hospital because of life threatening hyponatremia, probably due to SIADH. Laboratory tests and imaging were made to exclude possible causes of inadequate ADH release. 3% saline infusion together with dietary salt supplementation and fluid restriction were applied to restore sodium balance. The patient was successfully treated and discharged home without evident neurological deficits.