A nurse is caring for a client who is receiving morphine intravenously. Which of the following findings indicates the client is experiencing morphine toxicity?

Choice A reason: Hyperactive deep tendon reflexes are not linked to morphine toxicity. Morphine, an opioid, depresses the central nervous system, reducing reflexes. Hyperactive reflexes suggest neurological or stimulant effects, not opioid overdose, which primarily causes respiratory and consciousness depression in affected clients. Choice B reason: Fluid retention is not a primary sign of morphine toxicity. Morphine may cause urinary retention via sphincter tone increase, but fluid overload is unrelated. Toxicity manifests as respiratory depression or sedation, driven by mu-opioid receptor overstimulation, not fluid balance alterations. Choice C reason: Prolonged QT interval is associated with medications like antiarrhythmics, not morphine. Morphine toxicity primarily causes respiratory depression and sedation via central nervous system effects. Cardiac effects are rare, and QT prolongation is not a hallmark of opioid overdose in clinical settings. Choice D reason: Bradypnea indicates morphine toxicity, as opioids depress the brainstem’s respiratory center via mu-receptor overstimulation. This slows breathing, risking hypoxia and respiratory arrest, a life-threatening complication requiring immediate intervention like naloxone to reverse opioid effects and restore normal respiratory function.