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) Determine Glasgow Coma Scale score: While assessing the Glasgow Coma Scale (GCS) score is important for evaluating the level of consciousness and neurological status, it does not address the immediate life-threatening issue of severe respiratory depression and hypoxia. The client's critical respiratory status and low oxygen saturation require more urgent intervention. B) Prepare to assist with chest tube insertion: Preparing for chest tube insertion is not appropriate in this scenario, as the client's symptoms are related to severe respiratory depression rather than a condition that would require chest drainage. Chest tube insertion is indicated for conditions such as pneumothorax or pleural effusion, not for opioid overdose. C) Initiate cardiopulmonary resuscitation (CPR): CPR would be necessary if the client were in cardiac arrest or if there were no pulse and respiratory effort. However, the immediate issue appears to be severe respiratory depression rather than cardiac arrest, so administering a second dose of naloxone is a more appropriate and immediate action to address the cause of the client's condition. D) Administer a second dose of naloxone: Given the client’s severe respiratory depression and low oxygen saturation despite the initial dose of naloxone, it is crucial to administer a second dose. Naloxone is used to reverse opioid overdose effects, and its administration should be repeated if symptoms persist, ensuring the client’s safety and potentially reversing the opioid’s effects on the respiratory system.