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Difficulty: HardTrauma and Burns

A 25-year-old man is brought to the emergency department after being involved in a chemical plant fire. The incident occurred exactly 3 hours prior to his arrival. His weight is 70 kg70 \text{ kg}. Primary survey reveals a patent airway, but due to facial burns, he is electively intubated. Physical examination reveals deep partial-thickness and full-thickness burns involving his entire head and neck, his entire anterior trunk, and circumferential burns to both arms. There are no other burn injuries identified. Two large-bore intravenous catheters are placed. According to the traditional Parkland formula (4 mL/kg/% TBSA4 \text{ mL/kg/\% TBSA}), what should be the initial rate of intravenous crystalloid infusion for the remainder of the first 8-hour post-burn period?

Answer: 1260 mL/hr

Answer

1260
The correct initial infusion rate is 1,260 mL/hr1,260 \text{ mL/hr}. First, the percentage of burned body surface area (TBSA) is estimated using the Rule of Nines: the entire head and neck (9%9\%), the entire anterior trunk (18%18\%), and circumferential burns to both arms (9%+9%=18%9\% + 9\% = 18\%). This results in a total TBSA of 45%45\%. Second, using the traditional Parkland formula, the total 24-hour fluid requirement is calculated as 4 mL×70 kg×45%=12,600 mL4 \text{ mL} \times 70 \text{ kg} \times 45\% = 12,600 \text{ mL}. Third, exactly half of this volume (6,300 mL6,300 \text{ mL}) must be administered within the first 8 hours following the time of injury. Finally, because the patient arrived exactly 3 hours after the incident, there are only 5 hours remaining in this 8-hour window. The required hourly rate to deliver the necessary 6,300 mL6,300 \text{ mL} is 6,300 mL/5 hours=1,260 mL/hr6,300 \text{ mL} / 5 \text{ hours} = 1,260 \text{ mL/hr}.

Step-by-Step Solution

1
Calculate the burned Total Body Surface Area (TBSA) using the Rule of Nines.
TBSA = 45%
The Parkland formula requires an accurate estimation of the percentage of body surface area affected by second- and third-degree burns.
2
Calculate the total 24-hour resuscitation fluid volume using the traditional Parkland formula (4 mL×weight in kg×% TBSA4 \text{ mL} \times \text{weight in kg} \times \text{\% TBSA}).
Total Volume = 12,600 mL
This formula determines the massive fluid shift compensation required over the first 24 hours.
3
Determine the fluid volume required during the first 8 hours post-injury.
First 8-hour volume = 6,300 mL
Half of the calculated 24-hour total fluid requirement must be administered in the first 8 hours from the time of injury.
4
Calculate the time remaining in the first 8-hour window by subtracting the pre-hospital delay time.
Remaining time = 5 hours
The 8-hour clock starts at the moment of injury, not at the time of hospital arrival. The 3-hour delay must be subtracted from the 8-hour window.
5
Calculate the initial hourly infusion rate by dividing the required volume by the remaining time.
Infusion rate = 1260 mL/hr
This ensures the patient receives the necessary initial half of the fluid resuscitation within the strict 8-hour physiologic window.

Key Concept

Parkland formula resuscitation requires calculating TBSA via the Rule of Nines and delivering half the total calculated 24-hour volume within 8 hours from the TIME OF INJURY, adjusting the infusion rate for any presentation delay.
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Topics

Trauma and Burns

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