A nurse is caring for a client diagnosed with severe preeclampsia who is receiving intravenous magnesium sulfate for seizure prophylaxis. Which of the following findings should prompt the nurse to immediately intervene?

A. Respiratory rate of 8 breaths per minute: A respiratory rate below 12 breaths per minute is a sign of magnesium toxicity. Magnesium sulfate can depress the central nervous system, and a rate of 8 indicates potential respiratory compromise, requiring immediate intervention and possible discontinuation of the infusion. B. Urine output of 60 mL in the past two hours: Although slightly low, this output is not yet at the critical level of concern. Urine output should be ≥30 mL/hr to ensure magnesium is excreted effectively. Continued monitoring is needed, but it does not require immediate action. C. Deep tendon reflexes of +2: A +2 reflex is considered normal and indicates that the client is not currently experiencing neuromuscular depression. Loss or absence of reflexes would be more concerning for magnesium toxicity. D. Complaints of mild nausea and flushing: These are common and expected side effects of magnesium sulfate therapy. While they should be documented and monitored, they do not suggest toxicity and do not require urgent intervention.