The nurse observes that a client has become lethargic 30 minutes after receiving an opioid injection for pain. Which vital sign should the nurse obtain first?

Choice A Reason:While monitoring temperature is important for overall health assessment, it is not the most critical vital sign to check first in the context of opioid-induced lethargy. Opioids primarily affect the respiratory system, and respiratory depression is a significant risk. Therefore, temperature is not the priority in this scenario.Choice B Reason:Respiratory rate is the most critical vital sign to check first. Opioids can cause respiratory depression, which can be life-threatening. A decreased respiratory rate is a key indicator of opioid overdose or severe side effects. Monitoring the respiratory rate allows the nurse to assess the severity of the respiratory depression and take immediate action if necessary.Choice C Reason:Pulse rate is also an important vital sign, but it is secondary to respiratory rate in this context. While opioids can affect heart rate, the immediate concern with opioid-induced lethargy is respiratory depression. Therefore, checking the respiratory rate takes precedence over the pulse rate.Choice D Reason:Blood pressure is another vital sign that should be monitored, but it is not the first priority in this situation. Opioids can cause hypotension, but the primary and most immediate concern is respiratory depression. Therefore, the respiratory rate should be assessed first to ensure the client’s airway and breathing are adequate.