Severe hospital-acquired hyponatremia in acutely ill children receiving moderately hypotonic fluids

Intravenous maintenance fluid therapy in acutely and critically ill children: state of the evidence

Intravenous maintenance fluid therapy (IV-MFT) is one of the most prescribed, yet one of the least studied, interventions in paediatric acute and critical care settings. IV-MFT is not typically treated in the same way as drugs with specific indications, contraindications, compositions, and associated adverse effects. In the last decade, societies in both paediatric and adult medicine have issued evidence-based practice guidelines for the use of intravenous fluids in clinical practice. The main objective of this Viewpoint is to summarise and compare the rationales on which these international expert guidelines were based and how these recommendations affect IV-MFT practices in paediatric acute and critical care. Although these guidelines recommend the use of isotonic fluids as a standard in IV-MFT, some discrepancies and uncertainties remain regarding the systematic use of balanced fluids, glucose and electrolyte requirements, and appropriate fluid volume. IV-MFT should be considered in the same way as any other prescription drug and none of the components of IV-MFT prescription should be overlooked (ie, choice of drug, dosing rate, duration of treatment, and de-escalation). Furthermore, most evidence that was used to inform the guidelines comes from high-income countries. Although some principles of IV-MFT are universal, the direct relevance to and feasibility of implementing the guidelines in low-income and middle-income countries is uncertain.

Children with mild hyponatremia at the emergency department are at higher risk of hospitalization

BACKGROUND

Mild hyponatremia is frequently encountered in the pediatric emergency department (PED). Although usually of little clinical concern, its prognostic meaning as a possible marker of more severe disease has not yet been well established.

METHODS

We retrospectively analyzed data from children and adolescents who performed a blood sample with plasmatic sodium measurement on admission to the PED of IRCCS "Burlo Garofolo" Pediatric Hospital in Trieste, Italy, in 2019. We compared the rate, length of admissions and laboratory characteristics of patients with hyponatremia to those with normal sodium.

RESULTS

Among 807 subjects, hyponatremia (sodium < 135 mEq/L) was present in 17.6%, being mild (between 130 and 134 mEq/L) in 16.5%. Hyponatremic patients were younger, more frequently males, with an infection diagnosis, mainly of the respiratory tract and viral aetiology. They presented higher C-reactive protein (CRP) levels and erythrocyte sedimentation rates (ESR). Compared to normonatremic individuals, hyponatremic patients presented a higher risk of underlying infection (aOR 2.02; 95%CI 1.33-3.08), hospital admission (aOR 1.72; 95%CI 1.06-2.48), and a hospital stay of > 5 days (aOR 1.99; 95%CI 1.03-3.85). When considering only subjects with mild hyponatremia, we found similar results.

CONCLUSION

Hyponatremia and mild hyponatremia in the PED are associated with an increased admission rate and extended hospital stays. Mild hyponatremia should be considered a warning sign for a possibly more serious condition.