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# Maintenance Fluids in Pediatrics
## Overview
Pediatric intravenous (IV) fluid therapy is broadly categorized into maintenance (meeting baseline metabolic requirements) and resuscitation (correcting volume deficits or shock). Current clinical practice has shifted away from hypotonic saline (e.g., 0.2% NaCl) toward **balanced isotonic solutions** to prevent iatrogenic hyponatremia.
## Primary Indications
* Maintenance hydration in patients unable to meet requirements enterally.
* Resuscitation for hypovolemic, septic, or distributive shock.
* Correction of electrolyte disturbances.
## Adult Dosing
Standard adult maintenance is generally calculated using the "4-2-1" rule or 25–35 mL/kg/day, typically utilizing Isotonic Saline (0.9% NaCl) or balanced crystalloids (e.g., Lactated Ringer’s, Plasma-Lyte) with appropriate potassium supplementation.
## Pediatric Dosing
**Maintenance (Holliday-Segar Method):**
* **0–10 kg:** 100 mL/kg/day
* **11–20 kg:** 1000 mL + 50 mL for every kg over 10 kg
* **>20 kg:** 1500 mL + 20 mL for every kg over 20 kg
* *Hourly rate:* Divide daily total by 24.
* *Note:* Most institutions now favor **Isotonic fluids** (0.9% NaCl with D5 or D5-1/2NS) for maintenance rather than hypotonic solutions.
**Resuscitation:**
* **Bolus:** 20 mL/kg of Isotonic Crystalloid (0.9% NaCl or Lactated Ringer’s) rapid IV push. May repeat based on clinical response (e.g., perfusion, blood pressure).
* *Note:* Use 5–10 mL/kg in neonates or patients with suspected cardiac/renal compromise.
## Dose Adjustments
* **Renal/Cardiac Impairment:** Reduce volume to avoid fluid overload; close monitoring of inputs/outputs.
* **Hypernatremia:** Avoid rapid correction; use fluids with lower sodium content if dictated by serum sodium levels.
* **Age/Weight:** Always verify calculations against actual body weight; use ideal body weight in obese patients to avoid over-resuscitation.
## Contraindications
* Known hypersensitivity to specific fluid additives.
* Fluid overload states (e.g., severe heart failure, pulmonary edema) unless for resuscitation of shock.
## Adverse Effects
* **Iatrogenic Hyponatremia:** Associated with hypotonic fluids.
* **Hyperchloremic Metabolic Acidosis:** Associated with high-volume normal saline use.
* **Fluid Overload:** Peripheral/pulmonary edema, hypertension, heart failure exacerbation.
## Key Drug Interactions
* **Calcium-containing products:** Do not mix with phosphate-containing solutions or ceftriaxone.
* **Medication Incompatibilities:** Many IV drugs are incompatible with specific base fluids; check compatibility charts (e.g., Trissel's) before Y-site administration.
## Monitoring
* **Labs:** Serum electrolytes (Na, K, Cl, HCO3), BUN, Creatinine, and Glucose.
* **Clinical:** Daily weights, Strict intake and output (I&O), neurologic status (to monitor for cerebral edema), and vital signs.
* **Frequency:** Check electrolytes within 6–12 hours of initiating maintenance therapy in acute settings.
## Clinical Pearls
* **Isotonic Shift:** 0.9% NaCl is no longer considered the "superior" maintenance fluid due to risks of hyperchloremic acidosis. Balanced salt solutions (Lactated Ringer’s or Plasma-Lyte) are increasingly preferred.
* **Dextrose:** Always consider the need for Dextrose (e.g., D5), especially in neonates and younger children to prevent hypoglycemia.
* **Local Protocols:** Institutional protocols vary significantly regarding fluid choice and potassium supplementation; **always consult your local policy.**
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*Disclaimer: This information is for educational purposes only. Pediatric fluid requirements are highly individualized based on underlying medical conditions and clinical status. Always verify dosage, administration rate, and fluid composition against your institution’s current prescribing guidelines and the patient’s most recent laboratory data before administration.*
