Der Anaesthesist
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We report the case of a 4 year old boy who developed a massive water intoxication as a complication during knee arthroscopy. The sodium plasma concentration dropped to 100 mmol/l postoperatively. ⋯ The guidelines for replacing sodium in hyponatremia are discussed according to literature. In general, hyponatremia should be corrected in the same amount of time as it took for it to develop.