A 28-year-old man is brought to the emergency department 2 hours after a flame burn injury to his trunk and both upper limbs while working in a factory. On examination, he has erythema with blistering on the anterior chest, abdomen, and both arms. His vital signs are: HR 110/min, BP 100/65 mmHg, RR 22/min. Urine output is 0.3 mL/kg/hr. Using the Rule of Nines, the estimated total body surface area (TBSA) burned is 36%. Which of the following is the most appropriate immediate fluid resuscitation strategy?

Explanation

## Fluid Resuscitation in Acute Burn Management ### Parkland Formula — The Gold Standard **Key Point:** The Parkland formula is the most widely accepted protocol for initial fluid resuscitation in moderate-to-severe burns (>20% TBSA in adults). **Formula:** $$\text{Total fluid (24 hrs)} = 4 \text{ mL} \times \text{Body weight (kg)} \times \text{\%TBSA}$$ - **First 8 hours:** Half of calculated volume - **Next 16 hours:** Remaining half - **Fluid of choice:** Ringer's lactate (crystalloid) ### Why Ringer's Lactate? | Feature | Ringer's Lactate | Normal Saline | Hypertonic Saline | |---------|------------------|---------------|-------------------| | Electrolyte composition | Physiologic K⁺, Ca²⁺ | High Na⁺ load | Hypertonicity | | Hyperchloremic acidosis | No | Yes (common) | No | | Recommended in burns | **Yes** | No (2nd line) | Investigational | | Volume requirement | 4 mL/kg/%TBSA | Higher | Lower | **High-Yield:** The Parkland formula uses **4 mL**, not 2.5 mL. However, some institutions use **2.5 mL** as a modified formula to reduce fluid overload risk ("fluid creep"). In NEET PG, the **classic Parkland (4 mL)** is standard, but the question stem offers 2.5 mL as option A, which reflects the modern modified approach to prevent compartment syndrome and ARDS. ### Monitoring Endpoints 1. **Urine output target:** - Adults: 0.5 mL/kg/hr - Children: 1 mL/kg/hr - In this case, 0.3 mL/kg/hr is **inadequate** — fluid rate should be increased 2. **Vital signs:** HR <110/min, MAP >60 mmHg 3. **Serum osmolality:** Keep <320 mOsm/L **Clinical Pearl:** Fluid resuscitation is titrated to urine output, not fixed to the formula. The formula is a **starting point**; adjust based on response. ### Why Not the Other Options? - **Normal saline (4 mL):** Causes hyperchloremic metabolic acidosis and requires larger volumes; not preferred - **Hypertonic saline:** Experimental; increases serum osmolality and risk of renal dysfunction - **Dextrose solutions:** Contraindicated (hyperglycemia, osmotic diuresis) **Mnemonic:** **RINGER'S = BEST** — Ringer's lactate is the **Best Electrolyte Solution for Thermal injury**.