Fluids%2525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252520in%2525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252520pediatrics

# Fluids in Pediatrics ## Overview Maintenance fluid therapy is designed to provide water, electrolytes, and glucose to maintain homeostasis in patients unable to meet needs enterally. Over time, the "Holliday-Segar" formula has been challenged due to the risk of iatrogenic hyponatremia associated with hypotonic solutions; current consensus favors isotonic crystalloids. ## Primary Indications * Maintenance therapy for patients NPO. * Resuscitation (hypovolemia, shock). * Replacement of ongoing losses (gastrointestinal, burns). * Correcting pre-existing deficits. ## Adult Dosing * **Maintenance:** Generally 1,500–2,500 mL/day depending on size and metabolic rate. Isotonic fluids (0.9% NaCl or Plasmalyte/LR) are preferred over hypotonic solutions (e.g., 0.45% NaCl). ## Pediatric Dosing * **Maintenance (Holliday-Segar):** * 1–10 kg: 100 mL/kg/day * 11–20 kg: 1,000 mL + 50 mL/kg for each kg between 11-20 * >20 kg: 1,500 mL + 20 mL/kg for each kg >20 * *Calculate hourly rate by dividing total daily requirement by 24.* * **Fluid Selection:** Recent guidelines (AAP/consensus) recommend **isotonic solutions** (0.9% NaCl, Lactated Ringer’s, or Plasma-Lyte) for maintenance to prevent hyponatremia. * **Resuscitation:** 20 mL/kg bolus of isotonic crystalloid, repeated as clinical status requires. * *Note: Local protocols vary widely; always prioritize institutional guidelines regarding fluid choice and maintenance rate calculations, especially in neonates.* ## Dose Adjustments * **Renal/Cardiac/Hepatic Impairment:** Reduce maintenance rates to 50–75% of calculated needs to prevent fluid overload. * **Neonatal:** Maintenance requirements evolve from birth (Day 1: 60–80 mL/kg/day; Day 7: 150+ mL/kg/day). ## Contraindications * Fluid overload (edema, congestive heart failure). * Specific electrolyte imbalances (e.g., avoid high-potassium fluids in severe hyperkalemia or acute renal failure). ## Adverse Effects * Hyponatremia (associated with hypotonic maintenance fluids). * Hyperchloremic metabolic acidosis (high-volume 0.9% NaCl). * Fluid overload/pulmonary edema. * Hyperglycemia (if using dextrose-heavy solutions without insulin titration). ## Key Drug Interactions * **Incompatibility:** Many medications are physically incompatible with specific fluid components (e.g., Calcium-containing fluids with Ceftriaxone in neonates; precipitant risk). Always verify Y-site compatibility. ## Monitoring * **Electrolytes:** Sodium, Potassium, Chloride, Glucose. * **Output:** Urine output (target 1–2 mL/kg/hour in infants). * **Physical:** Daily weights, edema, lung sounds, heart rate, and blood pressure. * **Hydration Status:** Mucous membranes, capillary refill, fontanelle tension. ## Clinical Pearls * **Isotonic Shift:** Avoid hypotonic maintenance fluids (e.g., D5 1/4NS, D5 1/2NS) due to high risk of hospital-acquired hyponatremia. Isotonic fluids are safer for the vast majority of pediatric patients. * **Dextrose:** Always consider the need for glucose in maintenance fluids, particularly in neonates and infants <10 kg, to prevent hypoglycemia. * **Individualization:** Maintenance formulas are estimates; therapy must be refined based on clinical response, ongoing losses, and serial laboratory values. *** *Disclaimer: This information is for educational purposes only. Clinical practice varies by institution; always verify specific dosing and protocols with your local formulary, hospital guidelines, and current clinical pharmacy resources.*