A nurse is caring for a client who is receiving a continuous IV infusion of magnesium sulfate for preterm labor. The nurse should discontinue the infusion and prepare to administer calcium gluconate if the client demonstrates which of the following findings? (Select all that apply.)

The correct answers are A and C. Absence of deep-tendon reflexes and decreased level of consciousness are signs of magnesium toxicity, indicating the need to discontinue the magnesium sulfate infusion and administer calcium gluconate. Absence of deep-tendon reflexes is a hallmark sign of magnesium toxicity, as magnesium is a muscle relaxant that can lead to muscle weakness and hypotonia. Decreased level of consciousness is a severe symptom of magnesium toxicity, indicating central nervous system depression. Choices B, D, and E are incorrect because they do not directly indicate magnesium toxicity requiring calcium gluconate administration. Urine output, chills, and systolic blood pressure are not specific signs of magnesium toxicity and do not necessitate discontinuation of the magnesium sulfate infusion.