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# Fluids in Pediatrics ## Overview Maintenance fluid therapy is designed to replace ongoing losses of water and electrolytes in patients unable to meet requirements orally. Current consensus favors isotonic crystalloid solutions (e.g., 0.9% NaCl with Dextrose) over hypotonic solutions to prevent hospital-acquired hyponatremia. ## Primary Indications Maintenance of fluid/electrolyte balance, resuscitation for hypovolemic shock, and correction of dehydration. ## Adult Dosing Standard maintenance is calculated by body weight (typically 25–30 mL/kg/day) or the 4-2-1 rule. Resuscitation typically involves 30 mL/kg of isotonic crystalloid. *Note: Adult protocols vary significantly by institution.* ## Pediatric Dosing Maintenance dosing follows the Holliday-Segar formula (4-2-1 rule): * **0–10 kg:** 4 mL/kg/hour * **11–20 kg:** 40 mL/hour + 2 mL/kg/hour for every kg above 10 * **>20 kg:** 60 mL/hour + 1 mL/kg/hour for every kg above 20 * **Resuscitation:** 20 mL/kg isotonic crystalloid (bolus) over 5–20 minutes, repeated as clinically indicated. *Note: Always consult local institutional protocols, as many centers have shifted toward isotonic solutions (e.g., D5-NS or D5-1/2NS) for routine maintenance to reduce hyponatremia risks.* ## Dose Adjustments * **Renal/Cardiac Impairment:** Reduce volume and sodium intake to prevent fluid overload and pulmonary edema. * **Syndrome of Inappropriate Antidiuretic Hormone (SIADH):** Fluid restrict to 50–75% of maintenance requirements. * **Dehydration:** Add replacement volume (deficit + ongoing losses) to maintenance requirements. ## Contraindications * Fluid overload (Congestive Heart Failure, severe renal failure). * Severe electrolyte disturbances where specific tonicity is contraindicated (e.g., hypernatremia). ## Adverse Effects * **Hyponatremia:** Primarily associated with hypotonic maintenance fluids. * **Hyperchloremic Metabolic Acidosis:** Associated with high-volume 0.9% NaCl administration. * **Fluid Overload:** Edema, pulmonary edema, hypertension. ## Key Drug Interactions * **Incompatibility:** Avoid mixing incompatible medications (e.g., calcium and phosphate, certain antibiotics) in the same IV line. * **Potassium:** High rates of potassium-containing fluids require careful monitoring to prevent hyperkalemia. ## Monitoring * **Clinical:** Daily weight, strict intake/output (I/Os), physical exam (edema, lung sounds, cap refill). * **Laboratory:** Serum electrolytes (Na, K, Cl, Bicarbonate), glucose, BUN/Creatinine, urine specific gravity. ## Clinical Pearls * **Isotonic Preference:** Avoid hypotonic solutions (e.g., 1/4 NS or 1/2 NS without adequate dextrose) unless specifically indicated, due to the high risk of iatrogenic hyponatremia. * **Dextrose:** Pediatric patients, especially neonates and infants, have limited glycogen stores; maintenance fluids should generally contain 5% dextrose (D5) to prevent hypoglycemia. * **Weight-Based Approach:** Always use actual body weight for initial calculations, but adjust for clinical status (obesity vs. malnutrition). *** **Educational Disclaimer:** This information is for educational purposes only and does not supersede local institutional protocols. Always verify current prescribing information, institutional guidelines, and weight-based calculations via reliable clinical references (e.g., Harriet Lane Handbook, Lexicomp) before administering.