In the case of a gunshot wound to the chest, what type of dressing should be applied?

A three-sided dressing is the appropriate choice for a gunshot wound to the chest because it allows for the escape of air while preventing further entry of external contaminants into the pleural space. When applied, one side of the dressing remains open, which helps to prevent tension pneumothorax by allowing air that accumulates in the pleural cavity to escape. This is critical in trauma management, as the inability to release air can lead to increased pressure in the chest, compromising respiratory function and circulation.

A two-sided dressing does not provide the necessary airflow while maintaining a barrier to contaminants, and could lead to the development of tension pneumothorax. A four-sided dressing would seal off the chest completely, which is not advisable in this situation as it could trap air inside. A compressed dressing, while useful in controlling bleeding on other types of wounds, does not specifically address the unique complications associated with a gunshot wound to the chest.