... purposes)Vol 12 No 6ResearchThe epidemiology of intensive care unit- acquired hyponatraemia and hypernatraemia in medical-surgical intensive care unitsHenry Thomas Stelfox1,2,3, Sofia B Ahmed3,4, Farah ... 1Proportion of intensive care unit (ICU) patients with serum sodium val-ues outside the normal range during the first 50 days of ICU stay*Proportion of intensive care unit (ICU) patients with serum ... each additional unit) 1.08 (1.06 to 1.09) <0.001 1.05 (1.04 to 1.05) <0.001Mechanical ventilation NS NS 1.30 (1.20 to 1.42) <0.001Day of ICU stay (for each additional log unit day‡) 1.95...