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# Pediatric Fluid Therapy
## Overview
Fluid therapy in pediatrics requires high precision due to smaller circulating blood volumes and lower tolerance for electrolyte imbalances or fluid overload. Isotonic crystalloids (e.g., 0.9% Normal Saline or Balanced Salt Solutions like Lactated Ringer’s) are the standard for resuscitation. Maintenance therapy historically used hypotonic solutions, but isotonic fluids are now preferred to reduce the risk of hyponatremia.
## Primary Indications
* Resuscitation (hypovolemic shock, sepsis, trauma).
* Maintenance (inability to tolerate enteral intake).
* Correcting pre-existing deficits (dehydration).
## Adult Dosing
*Not applicable.* Pediatric fluid requirements vary significantly by age and weight.
## Pediatric Dosing
### Resuscitation
* **Initial Bolus:** 20 mL/kg of isotonic crystalloid (e.g., 0.9% NaCl or LR) administered as rapidly as possible (over 5–20 minutes). Repeat as clinically indicated.
* **Caution:** In cardiogenic shock, use smaller, more frequent boluses (e.g., 5–10 mL/kg over 10–20 minutes).
### Maintenance (Holliday-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:* Daily rates are often converted to hourly rates (e.g., divide daily total by 24). Many institutions now utilize weight-based "4-2-1" rules or local protocols prioritizing isotonic maintenance (e.g., D5W with 0.45% NaCl + KCl).
## Dose Adjustments
* **Renal/Cardiac Impairment:** Reduce maintenance fluids and increase monitoring frequency for fluid overload.
* **Dehydration Correction:** Add calculated deficit (mild/moderate) to maintenance and ongoing losses over 24–48 hours based on clinical assessment.
## Contraindications
* **Severe Fluid Overload:** (e.g., congestive heart failure, pulmonary edema).
* **Hypotonic solutions:** Use with extreme caution in children with neurologic injury (risk of cerebral edema) or SIADH.
## Adverse Effects
* **Hyperchloremic Metabolic Acidosis:** Commonly associated with high-volume 0.9% NaCl administration.
* **Fluid Overload:** Edema, hypertension, respiratory distress.
* **Iatrogenic Hyponatremia:** Risk increases with use of hypotonic maintenance fluids.
## Key Drug Interactions
* **Calcium-containing solutions (e.g., LR):** Avoid co-administration with ceftriaxone in neonates (≤28 days) due to risk of precipitation.
* **Drug Compatibility:** Always verify compatibility with IV medications; fluids can significantly alter drug delivery rates.
## Monitoring
* **Clinical:** Daily weights (most sensitive marker), intake and output (I&O), heart rate, blood pressure, capillary refill, and mucous membranes.
* **Laboratory:** Serum electrolytes (Na, K, Cl) and glucose; renal function (BUN/Cr).
* **Frequency:** More frequent monitoring (every 4–6 hours) required for sick neonates or intensive care patients.
## Clinical Pearls
* **Isotonic is Safer:** Avoid hypotonic maintenance fluids (e.g., 0.2% NaCl) in hospitalized children as they significantly increase the risk of hospital-acquired hyponatremia.
* **Balanced Solutions:** LR or Plasma-Lyte are often preferred over 0.9% NaCl in high-volume resuscitation to minimize the risk of acid-base disturbances.
* **Protocol Reliance:** Always consult your institution’s specific fluids and electrolytes protocol, as local standards often dictate exact compositions for maintenance fluids.
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**Disclaimer:** This information is for educational purposes only and does not replace medical judgment. Pediatric fluid requirements are complex and must be tailored to the individual patient’s underlying pathology. Always verify current prescribing information, institutional guidelines, and hospital policy before administration.
