Hyponatraemia and mesothelioma.

Hyponatraemia was found in 18 (62%) of 29 patients with histologically proven mesothelioma. The mechanism for the development of the hyponatraemia is discussed. It is suggested that patients with mesothelioma should be monitored for electrolyte abnormalities. If hyponatraemia is found the syndrome of inappropriate secretion of antidiuretic hormone should be suspected as treatment with demethylchlortetracycline may improve the quality of life in an otherwise fatal illness.