What is the purpose of leaving one side of an occlusive dressing loose when treating a sucking chest wound?

• A. To improve cosmetic appearance
• B. To prevent moisture buildup
• C. To allow air escape
• D. To speed wound healing

Answer: (C)

When a chest wound is treated with an occlusive dressing, you want to seal the wound but avoid creating a completely closed system. Air can be drawn into the chest through the wound during inhalation and—if the dressing is fully sealed—can become trapped, increasing pressure in the chest and risking a tension pneumothorax. Leaving one edge of the dressing loose provides a vent that allows air to escape from the chest cavity as breathing cycles increase pressure during exhalation, while still limiting air entry through the wound. This venting is the key reason for leaving that edge loose. The other answers don’t address this breathing-related pressure management and aren’t the primary purpose of the vent.