Naloxone is administered to an adult client following a suicide attempt with an overdose of hydrocodone bitartrate. Within 15 minutes, the client is alert and oriented. While planning nursing care, which intervention has the highest priority at this time?

A. Observe the client for further narcotic effects: Naloxone has a shorter half-life (30–90 minutes) than many opioids, including hydrocodone. After initial reversal, respiratory depression and decreased level of consciousness can recur once naloxone’s effect diminishes. Continuous monitoring of respiratory rate, oxygen saturation, and level of consciousness is essential to detect renarcotization. B. Determine the client's reason for attempting suicide: Psychosocial assessment is essential in the overall management of a suicide attempt. However, stabilization of physiologic status takes priority over exploration of intent. The client’s immediate safety from recurrent respiratory depression must be ensured before initiating detailed psychiatric evaluation. C. Obtain the client's serum hydrocodone/acetaminophen level: Laboratory evaluation is important, especially because hydrocodone is commonly combined with acetaminophen, which carries a risk of hepatotoxicity. However, laboratory testing does not supersede continuous respiratory and neurologic monitoring in the immediate post-reversal period. D. Encourage the client to increase fluid intake: Increasing fluids may support renal elimination and general recovery, but it does not address the immediate risk associated with opioid toxicity. The primary concern after naloxone administration is recurrent respiratory compromise. Hydration is supportive care and is not the highest priority at this stage.