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# Fluids in Pediatrics
## Overview
Pediatric fluid management is categorized into resuscitation (treating shock) and maintenance (meeting basal metabolic requirements while maintaining electrolyte balance). Isotonic crystalloids (e.g., 0.9% Normal Saline or Balanced Salt Solutions like Lactated Ringer’s) are the standard of care.
## Primary Indications
* **Resuscitation:** Hypovolemic, septic, or distributive shock.
* **Maintenance:** When enteral intake is inadequate to maintain hydration and electrolyte homeostasis.
* **Replacement:** To correct ongoing losses (e.g., NG suction, diarrhea, polyuria).
## Adult Dosing
Standard maintenance for adults is weight-based (approx. 25–35 mL/kg/day). Resuscitation typically begins with 500 mL–1 L boluses. *Note: Pediatric physiology differs significantly due to higher surface-area-to-body-mass ratio.*
## Pediatric Dosing
### Resuscitation
* **Shock:** 20 mL/kg of isotonic crystalloid bolus (e.g., 0.9% NS or LR) administered IV/IO as rapidly as possible.
* **Repeat:** Assess clinical response; repeat 20 mL/kg boluses as indicated by hemodynamic status.
* **Caveats:** In patients with cardiogenic shock or suspected DKA, smaller boluses (5–10 mL/kg) may be indicated.
### Maintenance (Holliday-Segar Method)
* **0–10 kg:** 100 mL/kg/day
* **11–20 kg:** 1000 mL + 50 mL/kg for each kg over 10 kg
* **>20 kg:** 1500 mL + 20 mL/kg for each kg over 20 kg
* *Hourly rate:* Divide the total daily requirement by 24.
* *Note:* Avoid hypotonic solutions (e.g., 0.2% NaCl) for maintenance due to high risk of hyponatremia; use isotonic fluids (0.9% NaCl with D5 or D5LR is common).
## Dose Adjustments
* **Renal/Cardiac Impairment:** Reduce maintenance fluids and monitor closely for fluid overload/edema.
* **Increased Loss:** Add replacement fluids based on measured/estimated (e.g., NG suction volumes).
## Contraindications
* **Severe Fluid Overload:** Pulmonary edema, congestive heart failure.
* **Specific Fluid Complications:** Avoid LR in specific cases of hyperkalemia (rarely limiting clinically) or incompatible medication admixture.
## Adverse Effects
* **Hyperchloremic Metabolic Acidosis:** Associated with high-volume 0.9% Normal Saline.
* **Fluid Overload:** Edema, systemic hypertension, pulmonary edema, hyponatremia (if using hypotonic fluids).
## Key Drug Interactions
* **Physical Incompatibility:** Always verify Y-site compatibility. For example, Calcium-containing fluids (LR) can precipitate with Ceftriaxone.
## Monitoring
* **Clinical:** Heart rate, capillary refill, urine output (>1 mL/kg/hr), blood pressure, neurologic status (signs of intracranial pressure).
* **Labs:** Serum electrolytes (Sodium, Potassium, Chloride), BUN/Creatinine, blood glucose, and acid-base status.
## Clinical Pearls
* **Isotonic Preference:** Large clinical trials (e.g., the SALT-ED and SMART trials) favor balanced crystalloids over 0.9% NS to reduce the risk of acute kidney injury and metabolic acidosis.
* **Glucose:** Neonates and small infants are at significant risk for hypoglycemia; ensure maintenance fluids contain glucose (e.g., D5W).
* **Protocols:** Always verify institutional guidelines, as resuscitation and maintenance protocols (including fluid composition) vary significantly between pediatric centers.
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**Educational Disclaimer:** This information is intended for educational purposes only. Pediatric fluid management requires precise clinical judgment based on the specific patient's underlying condition and hemodynamics. Always verify current institutional protocols and prescribing information before administration.
