Final answer:
According to the rule of nines, an adult man with partial- and full-thickness burns to his head, face, and anterior chest has burns to 27% of his total body surface area.
Step-by-step explanation:
According to the rule of nines, the estimation of the total body surface area (TBSA) involved in a burn is important for determining the treatment plan. For an adult man with partial- and full-thickness burns to his head, face, and anterior chest, the rule assigns 9% to the head and face and 18% to the anterior trunk (which includes the chest).
Therefore, the combined percentage of TBSA burned would be 9% (head and face) + 18% (anterior trunk) for a total of 27% of the adult man's total body surface area. The rule of nines is used to estimate the percentage of burned body surface area.
According to this rule, the head and neck are considered to be 9% of the total body surface area. The anterior chest (front of the chest) is also considered to be 9%. Therefore, if a man has burns to his head, face, and anterior chest, he would have burns to a total of 27% (9% + 9% + 9%) of his total body surface area.