Which statement best describes the function of a vented chest seal?

• A. Occlusive seal for chest wounds that prevents air entry
• B. Occlusive seal that allows air to escape but blocks entry
• C. Non-occlusive dressing for chest wounds
• D. Occlusive seal for chest wounds that allows air to escape and prevents air entry

Answer: (D)

A vented chest seal is designed to manage an open chest wound by sealing the wound while preventing air from entering the pleural space. The vented design acts like a one-way valve: it allows air to escape from the chest cavity during exhalation but blocks air from entering during inhalation. This stops air from being sucked into the chest and prevents pressure from building up, which can lead to a tension pneumothorax. An occlusive dressing that doesn’t vent could trap air and worsen pressure, while a non-occlusive dressing wouldn’t seal the wound properly. So the vented chest seal best fits the need to both seal the wound and permit controlled air escape.