Which action should be taken before applying a chest seal to an open chest wound?

• A. Fully Exhale
• B. Inhale deeply
• C. Speak to describe pain
• D. Hold breath

Answer: (A)

The action hinges on preventing air from being drawn into the chest wound during the next breath. Having the person fully exhale before applying the chest seal reduces the amount of air in the lungs and minimizes the suction effect when they next inhale. This helps prevent air from being sucked through the wound, which could worsen a sucking chest wound or lead to a tension pneumothorax.

Inhaling deeply would increase the potential for air to rush into the chest through the wound, which is precisely what you’re trying to avoid. Telling the patient to speak or holding their breath doesn’t address the risk in the same way, so they’re not as effective a preparation before applying the seal.