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Back to Endocrine Diseases

Syndrome of inappropriate antidiuretic hormone (SIADH)

Clinical suspicion

Suspect when there is water retention (antidiuresis) associated with an empty bladder and dilutional hyponatremia. There is no hypertension or edema.


Once suspected low serum sodium and osmolality accompanied by a high urine osmolality.


Fluid restriction.

Demethylchlortetracycline (demeclocycline) in patients unresponsive to fluid restriction. It may cause photosensitivity.

Severe hyponatremia is treated by hypertonic saline combined with frusemide to avoid volume overload.

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