Hyponatremia in children with acute respiratory infections: A reappraisal

Area of Science:

• Pediatrics
• Nephrology
• Pulmonology

Background:

• Hyponatremia (serum sodium <135 mmol/L) is frequently observed in pediatric patients hospitalized for bronchiolitis, pneumonia, or cystic fibrosis pulmonary exacerbations.
• Elevated antidiuretic hormone levels are typically associated with hyponatremia in this population.
• Acute hyponatremia can lead to severe consequences, including cerebral edema and pulmonary edema.

Purpose of the Study:

• To review the causes and management of hyponatremia in children admitted with respiratory conditions.
• To emphasize the importance of sodium level determination upon admission for specific pediatric respiratory illnesses.
• To outline current therapeutic strategies for managing hyponatremia in children.

Main Methods:

• Review of existing literature and clinical guidelines regarding pediatric hyponatremia.
• Discussion of diagnostic approaches, including laboratory evaluation and clinical assessment of fluid status.
• Analysis of treatment protocols for mild, severe, and rapidly developing hyponatremia.

Main Results:

• Hyponatremia is prevalent in children with bronchiolitis, pneumonia, and cystic fibrosis exacerbations.
• Clinical assessment of fluid volume status can be challenging in hyponatremic patients, often necessitating further laboratory tests.
• A therapeutic goal of sodium increase ≤6 mmol/L per day is recommended.
• Emergency correction with 3.0% saline bolus is advised for severe or rapidly symptomatic hyponatremia.

Conclusions:

• Sodium determination on admission is recommended for children with bronchiolitis, pneumonia, or cystic fibrosis pulmonary exacerbations.
• Management strategies vary based on hyponatremia severity and onset, with careful fluid therapy reassessment for mild cases.
• Rapid correction protocols exist for severe or acute symptomatic hyponatremia, aiming to prevent neurological complications.