A nurse is caring for a client who has major burns resulting from a house fire. Which of the following actions should the nurse take first?

When caring for a client with major burns, the priority action follows the ABCs of emergency care — airway, breathing, circulation. Establishing airway patency is the first priority because burns, especially from house fires, are commonly associated with inhalation injury. Superheated gases, smoke, and carbon monoxide can cause immediate airway edema, carbon monoxide poisoning, and asphyxiation. Airway edema can develop rapidly and may become complete obstruction within hours of injury, so early assessment and intervention — including potential endotracheal intubation — are critical and time-sensitive. Elevating the extremities helps reduce edema and is important in burn care but is not the first priority when airway compromise may be present. Determining the client's level of pain is a nursing concern but pain assessment is secondary to life-threatening priorities. Administering replacement fluids, while critical for managing burn shock, comes after airway management is secured because fluid resuscitation will not benefit a client who is not adequately oxygenating. Following the principle that life-threatening conditions are addressed in order of airway, breathing, and then circulation, establishing airway patency must come first.