Total Burn of Surface Area includes for right arm, chest and abdomen burn?

Appeared in: NORCET 5 Prelims - Sept 2023 (Shift-2)

Explanation

The 'Rule of Nines' is a standardized method used in adults to quickly estimate the total body surface area (TBSA) affected by burns.
According to this rule, the entire right arm accounts for 9% of the TBSA.
The anterior trunk is 18% total, which is commonly divided into the chest (9%) and the abdomen (9%).
Summing the percentages for the specified areas (right arm + chest + abdomen) gives a total of 9% + 9% + 9% = 27%.

Option A: 9% is incorrect as it only accounts for one of the three burned areas mentioned (e.g., only the right arm, or only the chest).
Option B: 18% is incorrect. It does not account for all three areas.
Option D: 36% is incorrect. This value overestimates the burn area described.

Visual 1: Diagram - An illustration of the 'Rule of Nines' on an adult human figure, showing the percentage breakdown for each body part (head, arms, trunk, legs). This helps visualize how the 27% is calculated from the arm, chest, and abdomen.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Calculation of Total Body Surface Area (TBSA) using the Rule of Nines for adult burns as background academic context rather than a clinical decision trigger.
Accurate TBSA calculation is critical for guiding fluid resuscitation using formulas like the Parkland formula, which prevents burn shock and organ failure.
The TBSA percentage determines the patient's triage category and whether they require transfer to a specialized burn center (typically for burns greater than 10-20% TBSA).
Nursing assessment of TBSA is a priority in the initial 'golden hour' of burn management, as it directly impacts the entire plan of care, including nutritional support and infection control measures.

How to Approach the Question

First, identify that the question is asking for a Total Body Surface Area (TBSA) calculation for a burn.
Recognize that the 'Rule of Nines' is the standard method for this calculation in adults.
Break down the question into the specific body parts mentioned: right arm, chest, and abdomen.
Recall or reference the percentage assigned to each part by the Rule of Nines: 9% for an arm, 9% for the chest, and 9% for the abdomen.
Sum the percentages for all the listed body parts: 9 + 9 + 9.
Calculate the total (27%) and select the corresponding option.

Concept Tested & Keywords

Concept Tested: Calculation of Total Body Surface Area (TBSA) using the Rule of Nines for adult burns.
Stem keywords: Total Burn of Surface Area, right arm, chest, abdomen
Lead-in keywords: includes

QIeM699GHe2N9VtAhMtAiH

Practise the full NORCET 5 Prelims - Sept 2023 (Shift-2)

Attempt every question from this paper in a timed mock, then review the full solution for each one.