A 38-year-old woman undergoes femoral nerve block for knee arthroscopy. The anesthesiologist injects 30 mL of 2% lidocaine with 1:100,000 epinephrine. Within 5 minutes, she develops perioral tingling, metallic taste, and visual disturbances. Her blood pressure is 142/88 mmHg and heart rate is 115/min. She is alert and oriented. Which of the following is the MOST appropriate next step?

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