An adult patient presents with burns covering the anterior trunk, right arm, and left leg. Using the Rule of Nines, what is the estimated percentage of total body surface area (TBSA) burned?

1. A

   54%

2. B

   36%

3. C

   45%

4. D

   27%

Appeared in: NCL (Northern Coalfields Limited)-NO

Explanation

• The Rule of Nines is a standardized method for quickly estimating the Total Body Surface Area (TBSA) of a burn in adults.
• It assigns percentages to different body regions in multiples of nine.
• For an adult, the anterior trunk (chest and abdomen) accounts for 18%, a full arm is 9%, and a full leg is 18%.
• The total TBSA is calculated by summing the percentages for the affected areas: 18% (anterior trunk) + 9% (right arm) + 18% (left leg) equals 45%.

Why Other Options Were Wrong

• Option A: This percentage is an overestimation. A TBSA of 54% could represent burns covering the entire trunk (36%) and one entire leg (18%).
• Option B: This percentage is an underestimation. A TBSA of 36% could represent burns to the entire trunk (anterior and posterior) or both legs, but it does not include all the areas specified in the question.
• Option D: This percentage is an underestimation. A TBSA of 27% would be the sum of one arm (9%) and one leg (18%), or the anterior trunk (18%) and one arm (9%). It omits one of the burned areas mentioned.

Related Visual

• Visual 1: Diagram - An illustration of the 'Rule of Nines' for an adult, showing the percentage of total body surface area for each major body part (head, arms, legs, trunk).

Clinical Relevance

• Nursing practice connection: Use the key finding related to TBSA estimation using the Rule of Nines for adult burn patients to guide bedside assessment, documentation, and the next nursing action.
• Accurate TBSA estimation is a critical first step in burn management as it directly influences the calculation for fluid resuscitation, most commonly using the Parkland formula (4 mL of Lactated Ringer's × patient's weight in kg × %TBSA).
• The TBSA percentage helps determine the severity of the burn, the need for transfer to a specialized burn center (typically for burns greater than 10-20% TBSA), and the overall treatment plan, including nutritional support and wound care.
• What if? - If the patient were an infant or young child, the Rule of Nines would be inaccurate due to their different body proportions (e.g., a larger head and smaller legs). In pediatrics, the Lund-Browder chart is the preferred, more accurate method for TBSA estimation.

How to Approach the Question

• First, identify that the question requires a TBSA calculation for an adult patient using the 'Rule of Nines'.
• Recall the specific percentages assigned to each body part in the adult Rule of Nines.
• List the body parts mentioned in the question: anterior trunk, right arm, and left leg.
• Assign the correct percentage to each part based on the rule: Anterior Trunk = 18%, Right Arm = 9%, Left Leg = 18%.
• Sum these percentages to calculate the total TBSA: 18 + 9 + 18.
• Compare the calculated total (45%) with the given options to select the correct answer.

Concept Tested & Keywords

• Concept Tested: TBSA estimation using the Rule of Nines for adult burn patients.
• Stem keywords: adult patient, burns, anterior trunk, right arm, left leg, Rule of Nines, TBSA
• Lead-in keywords: what is the estimated percentage

Question ID

Q9LuSRpbCaAVOm2mx7yBd

Copy ID