A 27 year old male has burns on his entire anterior chest and to the left upper extremity, circumferentially. What percentage of burns did he receive?

To determine the percentage of burns for this patient, it's essential to apply the Rule of Nines, which is a method used to quickly estimate the total body surface area (TBSA) affected by burns in adults.

In the case presented, the patient has burns on his entire anterior chest and to the left upper extremity, which can be broken down as follows:

1. The anterior chest constitutes 18% of the TBSA (as the entire front torso is counted).
2. The left upper extremity accounts for 9% of the TBSA. Since the burn is circumferential, it is important to consider the entire arm's surface area.

When combining these two areas, you add 18% for the anterior chest to 9% for the left upper extremity, resulting in a total of 27% TBSA affected by burns.

This total aligns with one of the provided choices and represents the extent of the injured surface area based on the commonly used assessment techniques in burn evaluation. The calculated percentage corresponds to a significant area, which is crucial for determining treatment protocols and fluid resuscitation needs in burn patients.