Which fluid resuscitation formula is recommended as the initial guideline for burn management in the first 24 hours, and what is the target urine output for an adult burn victim?

## Burn Fluid Resuscitation: Parkland Formula and Target Urine Output **Key Point:** The **Parkland formula** (4 mL × kg × %TBSA of Lactated Ringer's in the first 24 hours) remains the most widely taught and recommended **initial guideline** for burn fluid resuscitation in standard surgical and emergency medicine curricula (ATLS, Schwartz's Principles of Surgery, Bailey & Love). ### Fluid Resuscitation Formulas Comparison | Parameter | Parkland Formula | Modified Brooke | | --- | --- | --- | | **Formula** | 4 mL × kg × %TBSA | 2 mL × kg × %TBSA | | **Fluid Type** | Lactated Ringer's (LR) | Lactated Ringer's (LR) | | **Timing** | Half in first 8 hrs, half over next 16 hrs | Half in first 8 hrs, half over next 16 hrs | | **Target Urine Output (Adult)** | 0.3–0.5 mL/kg/hr (30–50 mL/hr) | 0.3–0.5 mL/kg/hr | | **Target Urine Output (Child)** | 1 mL/kg/hr | 1 mL/kg/hr | | **Status** | Standard initial guideline (ATLS 10th Ed.) | Alternative/adjunct formula | **High-Yield:** The Parkland formula is the **standard first-line formula** cited in ATLS 10th Edition and most surgical textbooks. The target urine output for adults is **0.3–0.5 mL/kg/hr** (approximately 30–50 mL/hr), NOT 1 mL/kg/hr (which applies to children or electrical burns). ### Why Option B is Correct - Parkland formula: **4 mL × kg × %TBSA** — universally recognized as the primary burn resuscitation formula in ATLS and NBE/NEET PG curricula. - Adult target urine output: **0.3–0.5 mL/kg/hr** — this is the standard endpoint for titrating fluid in adult burn victims, reflecting adequate renal perfusion without fluid overload. ### Clinical Pearl Urine output is the **primary clinical endpoint** for fluid titration in burns. The formula provides a starting estimate; the rate is adjusted up or down based on hourly urine output. Targeting >1 mL/kg/hr in adults risks fluid overload ("fluid creep"), while <0.3 mL/kg/hr suggests under-resuscitation. ### Why Other Options Are Wrong - **Option A (Parkland, 1 mL/kg/hr):** Parkland formula is correct, but 1 mL/kg/hr target applies to children/electrical burns, not routine adult burns. - **Option C (Modified Brooke, 0.3–0.5 mL/kg/hr):** Modified Brooke uses 2 mL/kg/%TBSA; while used in some centers, it is not the primary recommended initial guideline per ATLS. - **Option D (Modified Brooke, 0.5 mL/kg/hr):** Same issue — Modified Brooke is not the standard first-line formula per ATLS 10th Edition. **Mnemonic:** **"Parkland = 4, Park it first"** — Parkland is the first formula to know; Modified Brooke is the alternative. [cite: ATLS 10th Edition, Chapter 7; Schwartz's Principles of Surgery, 11th Ed.; American Burn Association Practice Guidelines]