Final answer:
To calculate the percentage of body surface area burned, use the rule of nines for different anatomical regions affected by burns.
Explanation:
The percentage of total body surface area burned can be calculated using the rule of nines, which assigns specific percentages to different anatomical regions affected by burns.
For the described burns to the posterior trunk and back of the head and neck, a total of 18% of the body surface area would be affected:
- 9% for the posterior trunk
- 9% for the head and neck
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