A 32-year-old man sustains a 45% total body surface area (TBSA) flame burn involving the chest, abdomen, and bilateral upper limbs. He is alert and oriented. Regarding fluid resuscitation in the first 24 hours using the Parkland formula, all of the following are correct EXCEPT:

Explanation

## Parkland Formula and Fluid Resuscitation in Burns ### The Parkland Formula: Correct Principles **Key Point:** The Parkland formula is the gold standard for calculating fluid requirements in the first 24 hours post-burn: $$\text{Volume (mL)} = 4 \times \text{Body weight (kg)} \times \text{\%TBSA burned}$$ **High-Yield:** Timing of infusion: - **First 8 hours from time of injury:** Half of the calculated volume - **Next 16 hours:** Remaining half - This ensures rapid initial resuscitation to prevent hypovolemic shock while avoiding fluid overload ### Fluid of Choice: Lactated Ringer's (LR) **Key Point:** Lactated Ringer's solution is the first-line crystalloid for burn resuscitation, NOT hypertonic saline. **Clinical Pearl:** Hypertonic saline (3%) is NOT recommended as first-line because: - Risk of hyperchloremic metabolic acidosis - Hypernatremia with prolonged use - LR is isotonic, physiologic, and contains lactate (metabolized to bicarbonate by the liver) - LR provides better outcomes in large-volume resuscitation **Warning:** Confusing hypertonic saline with LR is a common trap. Hypertonic saline may be used in specific scenarios (e.g., cerebral edema in inhalation injury) but NOT for routine burn resuscitation. ### Monitoring Adequacy of Resuscitation **Mnemonic:** URINE OUTPUT TARGETS — "PEE for BURN" - **P**atient urine output: 0.5 mL/kg/hr (adults), 1 mL/kg/hr (children <30 kg) - **E**nd-point: Adequate perfusion - **B**urn resuscitation titrated to urine output - **U**se Foley catheter mandatory - **R**eassess hourly - **N**eed for continued IV fluids **Clinical Pearl:** If urine output is inadequate despite Parkland formula, increase LR infusion rate. If urine output is excessive, reduce rate to avoid fluid overload and compartment syndrome. ### Table: Parkland Formula vs. Other Resuscitation Approaches | Aspect | Parkland Formula | Modified Brooke Formula | Hypertonic Saline | | --- | --- | --- | --- | | **Fluid** | Lactated Ringer's | Lactated Ringer's | 3% NaCl (NOT first-line) | | **Volume** | 4 mL/kg/%TBSA | 2 mL/kg/%TBSA | Reduced volume, higher osmolality | | **First 8 hrs** | 50% of total | 50% of total | Not recommended routinely | | **Advantage** | Proven, widely used | Reduced fluid overload risk | Smaller volume, but complications | | **Disadvantage** | Risk of over-resuscitation | Less aggressive | Hypernatremia, acidosis risk |