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# Fluids in Pediatrics
## Overview
Fluid therapy in pediatrics involves the calculation of daily maintenance requirements combined with an assessment of ongoing losses (dehydration, hemorrhage, or insensible losses). The shift in modern practice favors balanced isotonic crystalloids (e.g., Plasma-Lyte, Lactated Ringer's) over 0.9% NaCl to reduce the risk of hyperchloremic metabolic acidosis.
## Primary Indications
* Maintenance therapy for patients unable to tolerate enteral intake.
* Resuscitation in hypovolemic or septic shock.
* Replacement of ongoing abnormal losses (e.g., nasogastric suction, diarrhea).
## Adult Dosing
* **Maintenance:** Generally 1,500–2,500 mL/day depending on weight and clinical condition.
* **Resuscitation:** 500–1,000 mL boluses of isotonic crystalloid, titrated to hemodynamic response.
## 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 over 10 kg.
* >20 kg: 1,500 mL + 20 mL/kg for each kg over 20 kg.
* *Hourly rate:* Divide daily total by 24.
* **Resuscitation (Sepsis/Shock):** 20 mL/kg isotonic bolus (e.g., NS or LR) over 5–20 minutes. Repeat as needed based on reassessment.
* **Note:** Always verify dosing against local institutional protocols (e.g., "Choosing Wisely" guidelines suggest isotonic solutions are preferred over hypotonic for maintenance in children).
## Dose Adjustments
* **Renal/Cardiac Impairment:** Reduce maintenance volume by 20–50% or as dictated by clinical fluid status/strict intake and output monitoring.
* **Congestive Heart Failure:** Use caution; avoid fluid overload. Use lowest volume necessary.
## Contraindications
* **0.45% NaCl (or hypotonic solutions):** Avoid for routine maintenance in acute pediatric settings to minimize iatrogenic hyponatremia.
* **Volume Overload:** Severe pulmonary edema or clinically significant congestive heart failure.
## Adverse Effects
* **Fluid Overload:** Edema, ascites, hypertension, pulmonary edema, dilated cardiomyopathy (if chronic).
* **Electrolyte Disturbances:** Hyponatremia (due to hypotonic fluids), hyperchloremic metabolic acidosis (due to excessive 0.9% NaCl).
* **Tissue Perfusion Issues:** Excessive administration can lead to capillary leak and tissue swelling.
## Key Drug Interactions
* **Ceftriaxone:** Do not administer through the same line as calcium-containing fluids (like Lactated Ringer's) due to risk of precipitation.
* **Drug Diluents:** Always check compatibility for secondary infusions, especially regarding high-pH or high-calcium solutions.
## Monitoring
* **Physical Exam:** Weight (daily), skin turgor, mucous membranes, fontanelle (infants), respiratory effort (crackles).
* **Laboratory:** Serum electrolytes (Na, K, Cl), BUN/Creatinine, blood glucose.
* **Output:** Strict intake and output monitoring; target urine output >1 mL/kg/hr.
## Clinical Pearls
* **Isotonic Preference:** Large clinical trials confirm that isotonic fluids are safer for maintenance in children, significantly reducing hyponatremia events.
* **Glucose requirements:** In many pediatric patients, maintenance fluids should contain 5% dextrose (D5) to prevent ketosis, particularly in infants and toddlers.
* **Weight-Based Precision:** Accuracy is critical in pediatrics. Recalculate maintenance requirements whenever the patient's weight changes significantly.
* **Local Protocols:** Institutional protocols often dictate the specific fluid choices (e.g., D5-0.9% NaCl vs. D5-Plasma-Lyte). Always consult your local formulary.
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*Disclaimer: This information is for educational purposes and is not intended to replace clinical judgment or institutional protocols. Always verify dosages, compatibility, and infusion guidelines with your facility’s clinical pharmacy and the most current prescribing information/electronic health record.*
