The letter from Sanchez-Bayle et al,¹ partially describing a study on the administration of hypotonic intravenous fluids adds little to the safety of childrens receiving intravenous fluids. The deaths of at least 50 children attributable to the administration of hypotonic intravenous fluids in clinical settings, associated with increased circulating levels of antidiuretic hormone, have been described. Typically, these are previously healthy …