What is the role of a chest seal in field trauma care?

• A. To seal a closed chest wound to prevent air entry.
• B. To absorb blood from a chest wound.
• C. To immobilize the chest wall.
• D. To seal a sucking chest wound and prevent air entry while allowing air to escape.

Answer: (D)

A chest seal protects an open chest wound by stopping air from being sucked into the chest during inhalation while still allowing trapped air to escape if pressure builds inside. The occlusive but vented design prevents air entry that could cause a pneumothorax, and at the same time lets air exit to avoid tension from accumulating air in the chest. It’s not about absorbing blood or immobilizing the chest wall; those are handled by dressings and bindings, and the seal is specifically for preventing inward air flow on penetrating chest injuries.