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# Fluids in Pediatrics
## Overview
Pediatric fluid management involves calculating maintenance requirements to meet metabolic needs, replacing deficits (dehydration), and managing ongoing losses. Choice of fluid typically involves isotonic crystalloids (e.g., 0.9% Normal Saline or Balanced Salt Solutions like Lactated Ringer’s/Plasma-Lyte). Hypotonic maintenance fluids are generally discouraged in hospitalized children due to the high risk of iatrogenic hyponatremia.
## Primary Indications
* Maintenance therapy for children unable to tolerate enteral intake.
* Replacement of volume deficits (dehydration).
* Resuscitation for shock or severe hypoperfusion.
## Adult Dosing
Not applicable; dosing is weight-based in pediatrics.
## Pediatric Dosing
**Maintenance (Holliday-Segar Method):**
* 0-10 kg: 100 mL/kg/day
* 11-20 kg: 1,000 mL + 50 mL/kg for each kg >10
* >20 kg: 1,500 mL + 20 mL/kg for each kg >20
* *Note: Many institutions now use "simplified maintenance" (e.g., 4/2/1 mL/kg/hr).*
**Resuscitation:**
* Isotonic crystalloid bolus: 20 mL/kg rapid intravenous push (if shock is present).
* Maximum: No absolute maximum, but reassess clinical status (capillary refill, perfusion, hemodynamics) frequently.
**Replacement (Dehydration):**
* Variable based on grade of dehydration (mild: 3-5%, moderate: 6-9%, severe: 10%+). Calculated as: (Percent Dehydration × Weight in kg × 10) = mL to be replaced over 24-48 hours.
## Dose Adjustments
* **Renal/Cardiac Impairment:** Reduce volume and sodium load to prevent fluid overload and electrolyte imbalance.
* **SIADH/High ADH states:** Restrict fluids or use hypertonic solutions if severe hyponatremia is present.
## Contraindications
* Fluid overload (e.g., congestive heart failure, severe pulmonary edema).
* Severe oliguric/anuric renal failure (unless dialysis is planned).
## Adverse Effects
* Iatrogenic hyponatremia (most common with hypotonic solutions).
* Hyperchloremic metabolic acidosis (with excessive 0.9% Normal Saline).
* Fluid overload/pulmonary edema.
* Phlebitis or infiltration at IV site.
## Key Drug Interactions
* Ensure IV fluids are compatible with any medications infused via Y-site (e.g., calcium-precipitating drugs).
## Monitoring
* Serum electrolytes (Na, K, Cl, HCO3) at baseline and periodically.
* Strict Input/Output (I/O) tracking.
* Daily weight (the most sensitive indicator of fluid balance).
* Physical exam: capillary refill, mucous membranes, fontanelle status, and skin turgor.
## Clinical Pearls
* **Avoid Hypotonicity:** Current pediatric guidelines (AAP) recommend isotonic solutions (e.g., 0.9% NaCl with Dextrose) for maintenance to mitigate the risk of ADH-mediated hyponatremia.
* **Glucose Requirements:** Always include dextrose (usually D5 or D10) in maintenance fluids for neonates and young children to prevent hypoglycemia, as they have limited glycogen stores.
* **Protocol Dependency:** Dosing schedules and fluid selections are highly dependent on individual hospital/ICU clinical pathways. Always verify your local policy regarding "Maintenance Fluid Selection."
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*Disclaimer: This information is for educational purposes only. Always verify current prescribing information, local clinical protocols, and pharmacy guidelines before prescribing or administering IV fluids.*
