... sodium levels.ICU = intensive care unit, IQR = interquartile range.Figure 2Maximum deviation of serum sodium level from normal range during intensive care unit (ICU) admission and patient mortalityMaximum ... 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, ... 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‡)...