The nurse administers naloxone to a client with opioid-induced respiratory depression. One hour later, nursing assessment reveals that the client has a respiratory rate of 4 breaths/minute, oxygen saturation of 75%, and is unable to be aroused. Which action should the nurse implement?

A) Administer a second dose of naloxone: Opioid-induced respiratory depression can persist after the initial dose of naloxone, as naloxone has a shorter half-life than most opioids. Given the client's severe respiratory depression (respiratory rate of 4 breaths/min and oxygen saturation of 75%), a second dose of naloxone may be necessary to reverse the effects of the opioid more effectively. This is especially important since the client is still unresponsive and hypoxic, indicating that the initial dose was not sufficient. B) Determine Glasgow Coma Scale (GCS) score: While assessing the client's level of consciousness is important, it is not the most immediate action in this situation. The client's unresponsiveness and very low respiratory rate suggest a medical emergency requiring immediate intervention, such as administering another dose of naloxone. Evaluating the GCS can be done after more immediate life-saving actions, such as providing naloxone or initiating CPR if necessary. C) Initiate cardiopulmonary resuscitation (CPR): Although the client's respiratory depression is severe, the priority is to first address the cause of the respiratory depression—opioid overdose—by administering naloxone. CPR would be necessary if the client stops breathing or becomes pulseless, but at this stage, the more urgent action is to attempt to reverse the opioid effects first with naloxone, as the patient has a respiratory rate but is unresponsive. D) Prepare to assist with chest tube insertion: Chest tube insertion would not be appropriate for this scenario. Chest tubes are typically used for conditions such as pneumothorax or pleural effusion, not opioid overdose or respiratory depression. The priority here is reversing the opioid-induced respiratory depression with naloxone, not addressing a chest-related issue.