What is the function of a vented chest seal?

• A. Occlusive seal for chest wounds that allows air to escape and prevents air entry
• B. Occlusive seal for chest wounds that prevents air entry
• C. Non-occlusive dressing for chest wounds
• D. Seal that attaches to the chest to hold dressing

Answer: (D)

Vented chest seals are used on penetrating chest wounds to protect the pleural space by sealing the wound while also venting air that may accumulate. The key is occlusion combined with a vent that allows air to escape, not enter. This prevents air from being drawn into the chest and reduces the risk of a tension pneumothorax. A seal that merely holds a dressing in place doesn’t address the necessary occlusion and one-way ventilation, and non-vented or non-occlusive options can either trap air or fail to protect the wound.