A nurse in an emergency department is caring for a client who has a sucking chest wound resulting from a gunshot. The client has a blood pressure of 100/60 mm Hg, a weak pulse rate of 118/min, and a respiratory rate of 40/min. Which of the following actions should the nurse take?

Choice A rationale A sucking chest wound (open pneumothorax) allows air to enter the pleural space on inspiration, compromising lung function and potentially causing a tension pneumothorax. Removing an occlusive dressing in this situation converts the closed tension pneumothorax to an open pneumothorax, allowing trapped air to escape and temporarily relieve pressure on the heart and mediastinum, which is the immediate life-saving action. Choice B rationale While oxygen administration is necessary for hypoxemia, administering it via nasal cannula is insufficient for a client with severe respiratory compromise (rate 40/min) and likely significant shunting. A high-flow system, like a non-rebreather mask, is generally required to achieve adequate FiO_2 and improve arterial oxygen saturation, addressing the underlying respiratory failure. Choice C rationale Preparing for a central line insertion addresses potential volume depletion or need for rapid drug delivery, but it is not the most immediate life-saving action for a sucking chest wound. The priority is to address the mechanical ventilation defect. BP 100/60 mm Hg and HR 118/min suggest shock, but decompression is primary. Choice D rationale Elevating the foot of the bed 90° (or Trendelenburg position) is not indicated for a chest injury and may even worsen respiratory distress by increasing abdominal pressure against the diaphragm. Furthermore, this extreme position is generally not used for shock; the modified Trendelenburg (legs raised 20-30°) is sometimes used, but proper chest wound management is the priority.