Pediatric Burns Fluid Resuscitation: Parkland & Carvajal Guidelines

Fluid resuscitation in major pediatric burns represents a critical clinical challenge. Relative to adults, children have a significantly higher body surface area to mass ratio, thinner skin, and higher metabolic demand. This causes accelerated evaporative water losses from the burn site, making pediatric patients highly susceptible to rapid hypovolemia, shock, and organ dysfunction.

Clinicians must manage the dual challenge of under-resuscitation (which leads to hypovolemic shock, renal failure, and burn wound conversion) and over-resuscitation (which causes pulmonary edema, abdominal compartment syndrome, and pleural effusions). Resuscitation calculations must be computed immediately upon presentation.

1. Assessing Total Body Surface Area (TBSA)

Resuscitation guidelines are indicated for children with partial-thickness (second-degree) and full-thickness (third-degree) burns involving **>10% to 15% of TBSA**.

• Rule of Nines Limitations: The standard Rule of Nines is inaccurate in children because a child's head represents a larger proportion of TBSA (approx. 18% in infants), while the legs represent less (approx. 14%).
• Lund-Browder Chart: The gold-standard tool for pediatric burn assessment, as it dynamically adjusts percentages based on the child's exact age.

2. Fluid Resuscitation Formulas

Two primary equations are utilized clinically in pediatric emergency settings:

A. The Modified Parkland Formula

The Parkland formula determines fluid volume based on patient weight and burn percentage:

• Fluid Selection: Crystalloids, specifically Lactated Ringer's (LR) to prevent hyperchloremic metabolic acidosis.
• Important Additive: In children <30 kg, maintenance fluids containing dextrose (e.g. D5 1/2NS) must be run concurrently with the resuscitation fluids. Children have limited hepatic glycogen stores and will develop severe hypoglycemia under burn stress.

B. The Carvajal Formula (BSA-Based)

The Carvajal formula determines resuscitation volumes using Body Surface Area (BSA) rather than weight. Many pediatric burn centers prefer this method as it accounts for the child's high surface area water losses more accurately:

• Resuscitation and maintenance volumes are summed, and the total volume is run over 24 hours.

3. Fluid Administration Protocol

The calculated volume is administered sequentially over the first 24 hours:

• First 8 Hours: Give **50%** of the calculated volume. **Critical note:** The 8-hour window begins from the *time of the burn injury*, not from the patient's arrival in the emergency room.
• Next 16 Hours: Give the remaining **50%** of the volume.

4. Monitoring Resuscitation Adequacy

Resuscitation formulas serve as initial guides only; fluid rates must be titrated based on physiological endpoints. The gold-standard bedside measure of perfusion is **Urine Output (UOP)**:

Patient Cohort	Target Hourly Urine Output
Infants and Children (<30 kg)	1.0 to 1.5 mL/kg/hour
Adolescents (≥30 kg)	0.5 to 1.0 mL/kg/hour

Additional vital markers include normal mental status, age-appropriate heart rate, and clearing of serum lactate.