A patient receiving magnesium sulfate develops absent reflexes and respiratory depression. What is the immediate action?

A patient receiving magnesium sulfate develops absent reflexes and respiratory depression. What is the immediate action?

• A. Stop the magnesium sulfate infusion, administer calcium gluconate, and monitor respiratory status.
• B. Increase the magnesium sulfate infusion rate.
• C. Administer calcium gluconate while continuing the infusion.
• D. Continue the infusion and monitor.

Answer: (D)

Magnesium toxicity presents with neuromuscular and respiratory compromise, and absent reflexes are a classic early sign that the level is dangerously high. When this happens, the priority is to stop the magnesium sulfate infusion immediately to prevent any further increase in magnesium in the blood. Calcium gluconate is given IV because it rapidly antagonizes magnesium’s effects at the neuromuscular junction and heart, helping reverse the toxicity. After stopping the infusion and giving calcium gluconate, you must monitor the patient’s respiratory status and reflexes closely, and be prepared to support ventilation if needed. Continuing or increasing the magnesium would allow toxicity to progress, potentially leading to respiratory failure or cardiac issues, so stopping the infusion and administering the antidote are the essential steps.

Magnesium toxicity presents with neuromuscular and respiratory compromise, and absent reflexes are a classic early sign that the level is dangerously high. When this happens, the priority is to stop the magnesium sulfate infusion immediately to prevent any further increase in magnesium in the blood. Calcium gluconate is given IV because it rapidly antagonizes magnesium’s effects at the neuromuscular junction and heart, helping reverse the toxicity. After stopping the infusion and giving calcium gluconate, you must monitor the patient’s respiratory status and reflexes closely, and be prepared to support ventilation if needed. Continuing or increasing the magnesium would allow toxicity to progress, potentially leading to respiratory failure or cardiac issues, so stopping the infusion and administering the antidote are the essential steps.