A nurse is caring for a client who develops a pulmonary embolism. Which of the following interventions is the priority for the nurse to take?

Choice A reason: Pulmonary embolism obstructs pulmonary arteries, impairing gas exchange and causing hypoxemia. Oxygen therapy is the priority to correct hypoxia, stabilize respiratory status, and prevent tissue damage. This addresses the immediate life-threatening complication, ensuring adequate oxygen delivery before other interventions like fluids or monitoring are implemented. Choice B reason: IV lactated Ringer’s supports volume status but is not the priority in pulmonary embolism, where hypoxemia is the primary threat. Oxygen therapy directly addresses impaired gas exchange, while fluids are secondary to stabilize hemodynamics, making this a less urgent intervention in this acute scenario. Choice C reason: IV morphine relieves pain and anxiety in pulmonary embolism but does not address the primary issue of hypoxemia. Oxygen therapy is critical to correct low oxygen saturation, preventing organ damage, making morphine a secondary intervention compared to the immediate need for oxygenation. Choice D reason: Cardiac monitoring is important to detect arrhythmias in pulmonary embolism but is not the priority over oxygen therapy. Hypoxemia is the immediate life-threatening issue, requiring oxygen to restore gas exchange, making monitoring a supportive, not primary, intervention in the acute management of this condition.