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Review Question - QID 108164

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QID 108164 (Type "108164" in App Search)
A 54-year-old African American male presents to the emergency department with 1 day history of severe headaches. He has a history of poorly controlled hypertension and notes he hasn't been taking his antihypertensive medications. His temperature is 100.1 deg F (37.8 deg C), blood pressure is 190/90 mmHg, pulse is 60/min, and respirations are 15/min. He is started on a high concentration sodium nitroprusside infusion and transferred to the intensive care unit. His blood pressure eventually improves over the next two days and his headache resolves, but he becomes confused and tachycardic. Labs reveal a metabolic acidosis. Which of the following is the best treatment?