Burn Resuscitation

Major burns cause capillary leak, intravascular hypovolemia, and burn shock, making early fluid management a dynamic resuscitation problem rather than a fixed formula. In adults, burns over 20% TBSA usually trigger formal burn resuscitation; in children, the threshold is lower and urine output remains the key endpoint.

Initial Burn Resuscitation Principles

• Resuscitation threshold by TBSA: Formal burn resuscitation usually begins at more than 20% TBSA in adults and about 10-15% TBSA in children, with TBSA counting burns worse than superficial partial thickness.
• Accurate TBSA estimation: Getting TBSA right matters because fluid estimates hinge on it; when using the palm method, use the patient’s palm, and we get into practical estimation pitfalls in the episode.
• Burn shock physiology: Severe burns create persistent capillary leak, hypovolemia, and reduced cardiac output from a massive inflammatory response, so the core task is preserving perfusion without causing fluid overload.
• Lactated Ringer first line: Lactated Ringer is the preferred initial fluid because it is relatively iso-osmotic and less likely to create electrolyte problems than other crystalloids in early burn resuscitation.
• No set-and-forget fluids: Initial formulas are only a starting point; the hourly rate should be tapered or increased based on response rather than left unchanged through the first phase of care.

Monitoring, Adjustment, and Special Situations

• Urine output endpoint: Urine output is the primary bedside marker of tissue perfusion, with adult resuscitation targeting more than 30 mL per hour and pediatric care aiming for more than 1 mL/kg/hr.
• Escalation for poor response: If urine output stays low, increase the hourly fluid rate in small stepwise adjustments; hypotension despite adequate resuscitation may justify a 500 mL LR bolus, and we walk through that distinction in the episode.
• Avoid diuretic correction: Diuretics are not used to force urine output in burn shock because they obscure the endpoint and can worsen under-resuscitation when the problem is inadequate circulating volume.
• Higher-than-expected fluid needs: Electrical injury, inhalation injury, delayed presentation, dehydration, substance use, and very deep burns can all push patients beyond formula-based estimates and require more aggressive reassessment.
• Pediatric maintenance caveat: Children have higher fluid needs per body mass, and those under 30 kg also need dextrose-containing maintenance fluid because their glycogen stores are limited.
• Burn center referral triggers: American Burn Association referral criteria include more than 10% partial-thickness burns, full-thickness injury, special locations, chemical or electrical burns, inhalation injury, and complex psychosocial factors.

References:

1. American Burn Association. Advanced Burn Life Support Course Provider Manual. American Burn Association 2007. Link.
2. Watson T. Modern-day burn resuscitation: Moving beyond the parkland formula. emDOCs.net - Emergency Medicine Education. Published December 10, 2017. Link.
3. American Burn Association Advanced Burn Life Support (ABLS). Excerpted from Guidelines for the Operation of Burn Centers (pp. 79-86), Resources for Optimal Care of the Injured Patient 2006, Committee on Trauma, American College of Surgeons. Link.