Fluid Administration in Burn Patients

Initial Fluid Resuscitation

• The American Burn Association recommends that all burn patients receive 20 mL/kg of balanced crystalloid solution intravenously within the first hour of management, regardless of precise burn size assessment 1, 2
• Ringer's Lactate or Hartmann's solution should be used as the primary resuscitation fluid for both adults and children, as they have electrolyte concentrations closer to plasma 1, 2, 3

Fluid Resuscitation Protocols

• For adults with burns ≥10% TBSA, the Parkland Formula should be used to calculate 24-hour fluid requirements: 2-4 mL/kg/% TBSA, with half of the calculated volume administered in the first 8 hours and the remaining half over the next 16 hours 1, 2, 4
• The target urine output should be 0.5-1 mL/kg/hour to guide ongoing fluid administration 2, 4

Pediatric Fluid Resuscitation

• Children with burns ≥10% TBSA require the Modified Parkland Formula: 3-4 mL/kg/% TBSA for 24 hours, with the higher end of the range used for deep partial-thickness or full-thickness burns 2, 3
• Children typically need approximately 6 mL/kg/% TBSA over the first 48 hours, and the target urine output should be 0.5-1 mL/kg/hour 3, 4

Critical Monitoring Parameters

• Urine output is the easiest and fastest parameter to monitor and should be the primary endpoint, with a target of 0.5-1 mL/kg/hour 3, 4

Avoiding "Fluid Creep"

• Over-resuscitation causes significant morbidity and must be actively prevented, with studies showing 76% of resuscitations exceed the upper Parkland limit, averaging 6.3 mL/kg/% TBSA 2, 3, 4
• Complications of over-resuscitation include compartment syndrome, pulmonary edema, intestinal edema, and acute kidney injury 2, 4

Colloid Supplementation

• Albumin 5% supplementation should be considered starting at 8-12 hours post-burn in patients with large burns who require fluid rates above expected targets, with a target serum albumin level >30 g/L 4
• Hydroxyethyl starches (HES) are contraindicated in burn patients 4

NPO Management

• IV fluid administration should be continued during NPO periods using the calculated resuscitation formula for the first 24-48 hours, and early enteral nutrition should be initiated as soon as feasible 1, 3

Common Pitfalls to Avoid

• The Rule of Nines should not be used for TBSA calculation, as it overestimates TBSA in 70-94% of cases, leading to fluid over-administration 4
• The Lund-Browder chart should be used as the gold standard for TBSA assessment, and reassessment should be performed during initial management to prevent both overtriage and undertriage 2, 4
• Initial 20 mL/kg bolus should not be delayed while calculating precise TBSA, and rigid adherence to formulas should be avoided 1, 2
• Excessive fluid rates should not be continued once adequate urine output is achieved, and full-thickness burns increase the risk of wound conversion and may require volumes at the higher end of the Parkland range 2, 3
• Inhalation injury significantly increases mortality and fluid requirements, and electrical burns often cause deeper tissue damage than apparent on surface examination and may require higher fluid volumes 4

Fluid Resuscitation Guidelines for Burn Patients

Initial Fluid Bolus

Parkland Formula for Adults

Modified Parkland Formula for Children

Choice of Crystalloid

Monitoring and Goal‑Directed Adjustment

Urine Output

Clinical & Hemodynamic Parameters

Additional Monitoring

Limitations of Formula‑Based Resuscitation

Fluid Resuscitation Targets and Monitoring in Burn Patients

Urine Output Targets

• In both adult and pediatric burn patients, the recommended urine output to guide resuscitation is 0.5–1 mL/kg/h; values lower than this (e.g., 0.1 mL/kg/h) indicate oliguria, under‑resuscitation, and inadequate tissue perfusion【7】.
• Urine output is considered the simplest and fastest bedside parameter for adjusting fluid therapy during burn resuscitation【7】.

Blood Pressure Targets

• A mean arterial pressure (MAP) greater than 65 mm Hg is the target for adequate perfusion in burn resuscitation; a MAP of 45 mm Hg reflects critically low perfusion, may signal insufficient fluid administration, and often necessitates vasopressor support【7】.
• Persistent hypotension is linked to worse clinical outcomes and requires immediate corrective measures【7】.

Central Venous Pressure (CVP)

• A CVP of 8 mm Hg (approximately 8–12 cm H₂O) falls within the acceptable range for guiding fluid resuscitation in burn patients【7】.
• CVP should not be used in isolation; it must be interpreted together with urine output, MAP, and lactate trends to ensure comprehensive assessment【7】.
• Advanced hemodynamic monitoring that includes CVP is especially valuable in patients showing hemodynamic instability or persistent oliguria【7】.

Lactate Monitoring

• Early in burn resuscitation, lactate levels are typically elevated (mean ≈ 2.6 ± 2.0 mmol/L) and normalize within 24–32 hours when resuscitation is adequate【7】.
• A lactate concentration around 2 mmol/L is mildly elevated but approaching normal; serial lactate measurements serve as a useful marker of tissue perfusion and should demonstrate a downward trend with effective fluid therapy【7】.

Combined Monitoring Strategy

• The optimal approach to burn fluid resuscitation integrates multiple parameters rather than relying on a single value, with urine output as the primary endpoint and MAP, CVP, and lactate as secondary adjuncts【7】.

Risks of Inadequate or Excessive Resuscitation

• Both under‑resuscitation (leading to hypoperfusion) and over‑resuscitation (“fluid creep”) increase morbidity in burn patients【7】.

Fluid Management Recommendations

• Fluid infusion rates should be adjusted promptly based on the patient’s clinical response (e.g., urine output, MAP, CVP, lactate) instead of adhering rigidly to formulaic calculations【7】.

Fluid Resuscitation Targets in Pediatric Burn Patients with Concomitant Head Injury

Urine Output Guidance

• In children who have sustained both a burn injury and a head injury, aim for a urine output of ≥ 0.5 mL/kg/hour (rather than the usual 1 mL/kg/hour) to reduce the risk of cerebral edema from over‑resuscitation; use lactated Ringer’s cautiously because of its hypotonic nature, recognizing the dilemma since it remains the preferred crystalloid for burn resuscitation【8】.