Final answer:
The nurse should prepare to administer intravenous naloxone (Narcan) to the client.
Step-by-step explanation:
The nurse should prepare to administer intravenous naloxone (Narcan) to the client who is receiving morphine via a patient-controlled analgesia (PCA) pump. Naloxone is an opiate antagonist that reverses the respiratory depression caused by morphine. It does not produce analgesia or euphoria and is commonly used to treat acute narcotic intoxication and narcotic-induced respiratory depression.