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# Fluids in Pediatrics
## Overview
Fluid management in pediatrics focuses on maintaining homeostasis, replacing deficits, and managing ongoing losses. The "Holiday-Segar" method or modern isotonic protocols are standard, though practices are shifting toward isotonic solutions (e.g., 0.9% NaCl with additives) to avoid iatrogenic hyponatremia.
## Primary Indications
Maintenance fluids, resuscitation for hypovolemic shock, correction of dehydration, and provision of glucose/electrolytes when oral intake is compromised.
## Adult Dosing
Standard maintenance is typically 25–35 mL/kg/day, adjusted for clinical status. Resuscitation typically involves 30 mL/kg boluses of isotonic crystalloid.
## Pediatric Dosing
Dosing is highly dependent on institutional protocol (e.g., AAP vs. local practice).
* **Maintenance (Holiday-Segar Method):**
* 0–10 kg: 100 mL/kg/day.
* 11–20 kg: 1000 mL + 50 mL/kg for each kg >10 kg.
* >20 kg: 1500 mL + 20 mL/kg for each kg >20 kg.
* *Note: Many centers now prefer isotonic solutions (D5NS or D5 1/2NS) over hypotonic solutions for maintenance.*
* **Resuscitation:** 20 mL/kg bolus of Isotonic Crystalloid (0.9% NaCl or Lactated Ringer’s) IV over 5–20 minutes. Repeat as needed based on clinical response.
* **Dehydration Correction:** Calculate deficit based on % dehydration; replace deficit plus maintenance over 24–48 hours.
## Dose Adjustments
* **Renal/Cardiac Impairment:** Reduce volume and adjust electrolyte concentrations (potassium/sodium) based on serum levels and output.
* **SIADH:** Restrict fluids and monitor serum sodium closely.
## Contraindications
Severe fluid overload (e.g., pulmonary edema, severe CHF). Dextrose-containing fluids may be contraindicated in hyperglycemic states unless insulin is concurrently managed.
## Adverse Effects
Iatrogenic hyponatremia (associated with hypotonic fluids), hyperchloremic metabolic acidosis (with large volumes of 0.9% NaCl), fluid overload (edema, hypertension, pulmonary congestion), and thrombophlebitis.
## Key Drug Interactions
Fluid carriers can affect the stability and compatibility of additives. Always check compatibility charts (e.g., Trissel’s) when co-administering IV medications in the same line.
## Monitoring
Strict intake/output, daily weights, heart rate, blood pressure, capillary refill, mental status, serum electrolytes (especially Na, K, Cl), and glucose.
## Clinical Pearls
* **Isotonic Shift:** There is strong evidence that hypotonic maintenance fluids increase the risk of hospital-acquired hyponatremia in children; isotonic fluids should be the default unless specific contraindications exist.
* **Glucose:** Neonates and small infants have limited glycogen stores and require dextrose-containing fluids to prevent hypoglycemia.
* **Hyperkalemia:** Do not add potassium to maintenance fluids until the patient has demonstrated adequate urine output.
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*Disclaimer: This information is for educational purposes only. Pediatric fluid management practices vary significantly by institution and severity of illness. Always verify dosing and indications against current institutional protocols and the most recent edition of the Harriet Lane Handbook or equivalent pediatric prescribing references before administration.*
