• Facundo Jorro Barón, Cecilia Balladores, Pablo Carretero, Luciana Lombardo, Leonardo Mannino, and Sandra Martin.
• Hospital General de Niños Dr. Pedro de Elizalde, Buenos Aires, Argentina. jorrobox@yahoo.com.ar
• Arch Argent Pediatr. 2009 Aug 1; 107 (4): 335-9.

IntroductionBecause of the risk of developing hyponatremia, intravenous hydratation prescription in children with lower respiratory tract disease (LRTD) is challenging.ObjectiveTo evaluate if intravenous hypotonic fluid administration in children with LRTD leads to hyponatremia.MethodsPatients aged 1 month to 18 years, hospitalized for LRTD, requiring intravenous fluids were included. Blood samples to determine sodium levels were obtained before and within the first twenty four hours of fluids administration. A serum sodium decrease >or= 4 mEq/L was considered significative. Student t test and logarithmic regression was used to analyze results (significance level p<0.05).ResultsFrom 1039 patients hospitalized with LRTD (58 received intravenous fluids), 35 patients met the inclusion criteria. Median age was 3 months (1-60 months), 57.1% were males. Patients received 59.3 +/- 24 ml/h of intravenous fluids, 39.2 +/- 16 ml/h of electrolyte free water and 2 +/- 1.3 mEq/kg of sodium. Serum sodium was 141.2 mEq/l in the initial sample and 139.3 mEq/l in the second one. Mean serum sodium decrease was 1.9 +/- 4.8 mEq/l (IC 95%: 0.2-3.5; p< 0.026). Eleven patients had a sodium decrease >or=4 mEq/l, none showed clinical manifestation of hyponatremia. For each mEq/l of increase in initial natremia the odds of achieving a decrease in serum sodium >or=4 mEq/l increases in 40% (OR=1.39; IC 95%: 1.1-1.8).ConclusionA significant decrease in initial serum sodium has been observed in 11 of 35 patients. Higher initial serum sodium values increase the odds of a significant decrease.

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