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# Maintenance Fluids in Pediatrics
## Overview
Pediatric fluid management focuses on maintaining water and electrolyte balance. The "Holliday-Segar" method is the traditional standard for calculating maintenance requirements, though recent evidence favors isotonic solutions (e.g., 0.9% NaCl with dextrose/potassium) over hypotonic solutions to prevent hyponatremia.
## Primary Indications
Maintenance of hydration in patients unable to meet requirements enterally, correction of fluid deficits/dehydration, and resuscitation in shock.
## Adult Dosing
Standard maintenance is typically estimated at 25–35 mL/kg/day, or 1–1.5 mL/kcal of energy expenditure. Clinical status (renal/cardiac function) dictates specific volume.
## Pediatric Dosing
Maintenance rates are calculated based on weight (Holliday-Segar method):
* **1–10 kg:** 100 mL/kg/day
* **11–20 kg:** 1,000 mL + 50 mL/kg for each kg over 10 kg
* **>20 kg:** 1,500 mL + 20 mL/kg for each kg over 20 kg
* **Hourly rate:** Divide the total daily volume by 24.
* **Resuscitation:** 20 mL/kg of isotonic crystalloid (e.g., 0.9% NaCl or Lactated Ringer's) as a bolus, repeated as clinically indicated.
*Note: Institutional protocols often modify these standard calculations based on patient age, metabolic status, and underlying pathology.*
## Dose Adjustments
* **Renal/Cardiac Impairment:** Reduce volume (60–80% of calculated maintenance) to avoid fluid overload.
* **Hypermetabolic States (e.g., Fever, Burns):** Increase maintenance volume by 10–15% per degree Celsius of fever above 38°C.
* **SIADH/Edema:** Restrict total fluid intake as directed by serum sodium and clinical status.
## Contraindications
* **Fluid Overload:** Congestive heart failure, severe pulmonary edema.
* **Specific Fluid Components:** For example, avoid Lactated Ringer's in cases of severe hyperkalemia or pH imbalances in certain metabolic disorders.
## Adverse Effects
* **Fluid Overload:** Peripheral/pulmonary edema, hypertension, heart failure.
* **Electrolyte Imbalances:** Hyponatremia (most common with hypotonic fluids), hyperchloremic metabolic acidosis, hyper-/hypokalemia.
* **Hyperglycemia:** Risk when using high dextrose concentrations (e.g., D10W or higher) without insulin monitoring.
## Key Drug Interactions
* **Ceftriaxone:** Do not administer with calcium-containing fluids (e.g., Lactated Ringer's) in neonates; creates risk of life-threatening precipitates.
* **Incompatible Drugs:** Many medications (e.g., phenytoin, amiodarone) precipitate in saline; check Y-site compatibility charts for every drug added to a maintenance line.
## Monitoring
* **Physical Exam:** Weight (daily), strict Intake/Output (I&O), skin turgor, mucous membranes.
* **Laboratory:** Serum electrolytes (Na, K, Cl, HCO3), BUN, Creatinine, and blood glucose.
* **Hemodynamics:** Blood pressure and heart rate.
## Clinical Pearls
* **Isotonic Preference:** Avoid 0.45% or 0.2% NaCl ("hypotonic") for routine maintenance in acute settings due to the significant risk of iatrogenic hyponatremia.
* **Additives:** Maintenance fluids rarely contain adequate potassium or dextrose requirements in isolation; neonates and infants require glucose support (typically D5 or D10) to prevent hypoglycemia.
* **Local Policy:** Always adhere strictly to the specific pediatric formulary and fluid protocols of your clinical institution, as these vary significantly by specialty (e.g., PICU vs. General Pediatrics).
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**Disclaimer:** This information is for educational purposes only and does not constitute medical advice. Always consult current institutional protocols, prescribing information, and evidence-based clinical guidelines before prescribing or administering fluids.
