Review Question - QID 216585

A 44-year-old man presents to the emergency department acutely confused. The patient’s wife states she found him lethargic at home. He has been sick the past week with diarrhea and has been staying home from work. He is otherwise healthy and does not take any medications. His temperature is 97.5°F (36.4°C), blood pressure is 62/32 mmHg, pulse is 185/min, respirations are 25/min, and oxygen saturation is 98% on room air. The patient has profuse, bloody diarrhea while in the emergency department. The patient is given 3L of ringer lactate and subsequently appears less confused, with a blood pressure of 100/70 mmHg. He is able to drink oral fluids and protect his airway. An ECG is performed as seen in Figure A. He continues to have diarrhea while in the emergency department. Which of the following is contraindicated in the management of this patient?