Final answer:
When a patient on magnesium sulfate IV therapy has decreased Deep Tendon Reflexes, the nurse should discontinue the magnesium sulfate infusion to prevent further toxicity and notify the healthcare provider.
Step-by-step explanation:
If a patient receiving magnesium sulfate intravenously has decreased Deep Tendon Reflexes (DTRs), it could be a sign of magnesium toxicity, which is a serious concern. The appropriate nursing action in this case is b) Discontinue mag sulfate infusion. Continued administration of magnesium sulfate in the presence of decreased DTRs can lead to more severe signs of toxicity, which may include respiratory depression, cardiac arrest, and coma. Therefore, it's essential to stop the magnesium infusion immediately. Moreover, the nurse should notify the healthcare provider and monitor the patient's vital signs and magnesium levels. Generally, the nurse should be prepared to administer calcium gluconate as an antidote for severe magnesium toxicity under the direction of a healthcare provider.