Two days after surgical fixation of a fractured femur, a client suddenly reports chest pain and difficulty in breathing. The nurse suspects the client had a pulmonary embolus. Which action should the nurse take first?

Choice A reason: Notifying the healthcare provider is an important action, but not the first one. The nurse should prioritize interventions that address the client's immediate needs, such as oxygenation and circulation.Choice B reason: Preparing a continuous heparin infusion per protocol is an appropriate action for preventing further clot formation and reducing the risk of recurrent pulmonary embolism, but it is not the first action. The nurse should first stabilize the client's condition before administering anticoagulant therapy.Choice D reason: Bringing the emergency crash cart to the bedside is a prudent action, but not the first one. The nurse should prepare for possible cardiopulmonary resuscitation (CPR) in case of cardiac arrest, but should first attempt to prevent it by providing oxygen and other supportive measures.