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# Fluids in Pediatrics
## Overview
Pediatric fluid management is categorized into resuscitation (bolus therapy for shock) and maintenance (daily water and electrolyte requirements). Isotonic crystalloids (e.g., 0.9% Normal Saline or Balanced Salt Solutions like Lactated Ringer’s) are the standard of care for resuscitation. Hypotonic solutions (e.g., 0.45% NS) are increasingly discouraged for maintenance due to the risk of iatrogenic hyponatremia; isotonic solutions are now preferred.
## Primary Indications
* **Resuscitation:** Hypovolemic or septic shock.
* **Maintenance:** Inability to maintain oral intake or physiological requirement to support metabolic demand.
* **Replacement:** Correction of ongoing losses (e.g., NG suction, diarrhea, stoma output).
## Adult Dosing
* **Resuscitation:** 30 mL/kg (sepsis protocol) or rapid boluses of 500–1000 mL crystalloid.
* **Maintenance:** Generally 1500–2500 mL/day depending on clinical status.
## Pediatric Dosing
* **Resuscitation:** 20 mL/kg bolus of isotonic crystalloid (NS or LR) over 5–20 minutes. Repeat as needed based on clinical response (HEART score/perfusion).
* **Maintenance (Holliday-Segar Method):**
* 0–10 kg: 100 mL/kg/day
* 11–20 kg: 1000 mL + 50 mL/kg for each kg >10
* >20 kg: 1500 mL + 20 mL/kg for each kg >20
* *Maximum maintenance: 2400 mL/day.*
* *Note:* Clinicians often simplify this to the "4-2-1 rule" for hourly rates (4 mL/kg/hr for first 10kg, 2 mL/kg/hr for next 10kg, 1 mL/kg/hr for remaining kg).
## Dose Adjustments
* **Renal Impairment:** Reduce volume and adjust electrolyte concentration based on urine output and serum creatinine.
* **Cardiac/Liver Disease:** Reduce volume to prevent fluid overload and pulmonary edema (often 0.5–0.75x standard maintenance).
* **Dehydration Correction:** Calculate deficit based on % dehydration weight loss. Replace deficit over 24–48 hours in addition to daily maintenance.
## Contraindications
* Severe fluid overload (e.g., congestive heart failure, pulmonary edema).
* Acute cerebral edema (standard aggressive boluses may be contraindicated).
* Avoid hypotonic solutions in patients at risk for increased intracranial pressure or SIADH.
## Adverse Effects
* Iatrogenic hyponatremia, hyperchloremic metabolic acidosis (with excessive 0.9% NS), fluid overload, peripheral/pulmonary edema, and electrolyte imbalances (hyperkalemia/hypokalemia depending on additive).
## Key Drug Interactions
* **Calcium-containing solutions:** Incompatibility with bicarbonate or phosphate-containing products (risk of precipitate).
* **Medication Diluents:** Always verify drug compatibility with the specific IV fluid (e.g., Ceftriaxone with Calcium-containing fluids).
## Monitoring
* Daily weight (most sensitive indicator of fluid balance).
* Strict intake/output logs.
* Serum electrolytes (Na, K, Cl) every 6–24 hours depending on acuity.
* Blood glucose (especially in infants).
* Physical assessment: Mucous membranes, fontanelle, capillary refill, respiratory effort, heart rate.
## Clinical Pearls
* **Isotonic Shift:** Current pediatrics literature strongly favors isotonic fluids (e.g., NS, LR, Plasmalyte) for maintenance to prevent hospital-acquired hyponatremia.
* **Balanced Solutions:** LR or Plasmalyte are often preferred over 0.9% NS in large-volume resuscitation to avoid hyperchloremic metabolic acidosis.
* **Glucose:** In neonates and small infants, add Dextrose (D5 or D10) to maintenance fluids to prevent hypoglycemia, as glycogen stores are limited.
* **Local Protocol:** Always adhere to specific institutional fluid ordering protocols, as these often dictate the specific electrolyte additives required for maintenance.
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**Disclaimer:** This information is for educational purposes only. Pediatric fluid requirements are highly individualized and fluctuate based on clinical condition. Always verify current institutional guidelines and prescribing information through a hospital formulary or clinical pharmacist before administration.
