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# Fluids in Pediatrics
## Overview
Pediatric intravenous fluid therapy requires a precise balance of volume, tonicity, and electrolyte composition. Current clinical consensus favors **isotonic fluids** (e.g., 0.9% Sodium Chloride or Lactated Ringer's) for initial resuscitation and maintenance to reduce the risk of iatrogenic hyponatremia.
## Primary Indications
* **Resuscitation:** Hypovolemic shock (hemorrhagic, septic, distributive).
* **Maintenance:** Replacement of ongoing obligatory water and electrolyte losses when enteral intake is insufficient.
* **Replacement:** Correction of deficits (e.g., dehydration, electrolyte imbalances).
## Adult Dosing
* **Resuscitation:** 30 mL/kg isotonic bolus (usually 0.9% NaCl or LR) administered rapidly; reassess after each bolus.
* **Maintenance:** Varies by clinical status; typically 25–35 mL/kg/day or calculated via 1500 mL + 20 mL for every kg over 20 kg.
## Pediatric Dosing
*Dosing is highly protocol-dependent; consult institutional guidelines.*
* **Resuscitation:** 20 mL/kg per bolus of isotonic crystalloid (e.g., 0.9% NaCl or LR). May repeat; monitor for fluid overload. In septic shock, follow Surviving Sepsis Campaign guidelines (early, aggressive boluses).
* **Maintenance (Holliday-Segar Method):**
* 100 mL/kg/day for the first 10 kg.
* 50 mL/kg/day for the next 10 kg.
* 20 mL/kg/day for each kg > 20 kg.
* Total daily volume is usually converted to an hourly rate (divide by 24).
* **Electrolyte additives:** Frequently add KCl (10–40 mEq/L) to maintenance fluids *only* after confirming adequate urine output and normal serum potassium.
## Dose Adjustments
* **Renal/Cardiac Disease:** Volume restriction or reduction of maintenance rate (e.g., 60–80% of calculated) may be required.
* **Dehydration Correction:** Calculate fluid deficit based on percentage of weight loss and replace over 24–48 hours in addition to maintenance requirements.
## Contraindications
* **Hypotonic maintenance fluids:** Traditionally D5W or 0.45% NaCl are avoided in acutely ill children due to high ADH states and risk of cerebral edema (hyponatremia).
* **Congestive Heart Failure:** Use extreme caution with bolus volumes.
## Adverse Effects
* **Hyperchloremic metabolic acidosis:** Associated with large volumes of 0.9% NaCl.
* **Iatrogenic Hyponatremia:** Associated with hypotonic maintenance fluids.
* **Fluid Overload:** Pulmonary edema, hypertension, heart failure.
## Key Drug Interactions
* **Precipitation:** Incompatible with many medications (e.g., calcium-containing fluids with ceftriaxone, though rarely an issue with standard crystalloids).
* **Diluent Interference:** Do not use LR with certain medications (e.g., heparin, some IV antibiotics) due to calcium content.
## Monitoring
* **Baseline:** Weight, electrolytes (Na, K, Cl, Glucose), BUN/Creatinine, Acid-base status.
* **Ongoing:** Urine output (goal: 0.5–1 mL/kg/hr), bedside weights, frequent vital signs (heart rate, blood pressure), signs of edema, serum sodium concentration.
## Clinical Pearls
* **Isotonic preference:** Evidence supports isotonic fluids (e.g., 0.9% NaCl, Plasmalyte, LR) over hypotonic fluids for routine maintenance to optimize safety.
* **Check Potassium:** Never add potassium to fluids until after the patient has demonstrated adequate renal function and voided.
* **Dextrose:** Always consider the need for maintenance glucose, particularly in infants and toddlers (e.g., D5-containing fluids) to prevent hypoglycemia.
* **"Keep Open" (KVO):** Avoid large-volume fluid overload for patients solely needing venous access; use minimal rates.
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*Disclaimer: This information is for educational purposes only. Dosing, fluid type, and administration protocols vary by institution, patient acuity, and clinical condition. Always verify current institutional prescribing policies and consult with a pediatric specialist or local pharmacy guidelines before ordering or administering intravenous fluids.*
