A Prospective Cohort Study on Serum Sodium and Clinical Outcome in Pediatric Nontraumatic Coma

Objective To study the serum sodium level and clinical outcome in pediatric nontraumatic coma. Methods A prospective cohort study was conducted in a tertiary care pediatric intensive care unit (PICU) from September 2015 to June 2016. Children aged < 13 y with nontraumatic coma [modified-Glasgow Coma Scale (m-GCS) score <= 8 or fall of >= 3 from baseline within 24 h of admission] were included. Children who received intravenous fluids for > 24 h, those with developmental delay, or died within 24 h of admission were excluded. The serum sodium profile (mEq/L) in the first 72 h and clinical outcome [mortality, length of stay in mechanical ventilation, PICU, and hospital] were studied. Results Eighty patients [Died n = 26 and Survived n = 54] were enrolled. Median [interquartile range (IQR)] age and m-GCS were 21 (4-78) mo and 9 (7-11), respectively. The mean [standard deviation (SD)] Pediatric Risk of Mortality-III (PRISM-III) was 17.7 (4). The most common etiology was acute central nervous system (CNS) infections (30%, n = 24) followed by an intracranial bleed (11.3%, n = 9). Mean (Standard error, SE) sodium levels and fluctuation of serum sodium from baseline up to 72 h were similar between nonsurvivors and survivors [140.8 (1.3) vs. 139.6 (0.8), p = 0.421] and [1.2 (0.3) vs. 0.8 (0.2), p = 0.307], respectively. On multivariate analysis, the need for vasoactive therapy was an independent predictor of mortality [adjusted odds ratio = 20.78, 95% CI 4.24-101.85, p = < 0.001, R-2 = 0.62]. Conclusion Mean serum sodium within normal range and fluctuation of serum sodium of 0.8 to 1.2 mEq/L over 72 h was not associated with poor outcomes in pediatric nontraumatic coma. Vasoactive therapy was an independent predictor of mortality.