Review Question - QID 216359

A 65-year-old man presents to the emergency department with sudden-onset altered mental status. He was last seen normal 1 hour ago. His wife noticed that he was confused, slurring his speech, and had notable weakness that caused him to drop his cup of coffee. The patient is confused and not able to answer any questions. Facial drooping of the left lower face is noted, and the patient cannot follow any commands. He has a past medical history of diabetes and atrial fibrillation and is currently taking warfarin. His other medications are not known. His temperature is 98.0°F (36.7°C), blood pressure is 150/90 mmHg, pulse is 115/min, and respirations are 17/min. The patient is not able to follow any commands for further neurologic evaluation but does not appear to be moving his right upper extremity. In addition to further physical exam, which of the following is the most appropriate next step in management?