Normal saline is a safe initial rehydration fluid in children with diarrhea-related hypernatremia

To demonstrate safety and efficacy of using normal saline (NS) for initial volume expansion (IVE) and rehydration in children with diarrhea-related hypernatremic dehydration (DR-HD), forty eight patients with DR-HD were retrospectively studied. NS was used as needed for IVE and for initial rehydration. Fluid deficit was given over 48 h. Median Na⁺ level on admission was 162.9 mEq/L (IQR 160.8–165.8). The median average hourly drop at 6 and 24 h was 0.53 mEq/L/h (0.48–0.59) and 0.52 mEq/L/h (0.47–0.57), respectively. Compared to children not needing IVE, receiving ≥40 ml/kg IVE was associated with a higher average hourly drop of Na⁺ at 6 h (0.51 vs. 0.58 mEq/L/h, p = 0.013) but not at 24 h (p = 0.663). The three patients (6.3%) with seizures had a higher average hourly drop of Na⁺ at 6 and 24 h (p = 0.084 and 0.021, respectively). Mortality (4/48, 8.3%) was not related to Na⁺ on admission or to its average hourly drop at 6 or 24 h. Children receiving ≥40 ml/kg IVE were more likely to die (OR 3.3; CI, 1.5–7.2). Conclusion: In children with DR-HD, NS is a safe rehydration fluid with a satisfactory rate of Na⁺ drop and relatively low incidence of morbidity and mortality. Judicious use of IVE should be exerted and closer monitoring should be guaranteed for children requiring large volumes for IVE and for those showing rapid initial drop of serum Na⁺ to avoid neurological complications and poor outcome.