A 34-year-old woman at 28 weeks gestation presents with sudden-onset severe headache, visual disturbances, and a blood pressure of 162/110 mmHg. Urinalysis shows 3+ proteinuria. She is started on magnesium sulfate and labetalol. Four hours later, her urine output drops to 18 mL/hour and her serum magnesium level is 9.2 mEq/L. She becomes areflexic. What is the most appropriate next step?

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