Review Question - QID 214944

A 27-year-old woman presents to the emergency department with altered mental status. Her boyfriend found her at home next to a suicide note and brought her into the emergency department. According to her boyfriend, the patient has a medical history of bipolar disorder for which she takes lithium, as well as chronic lower back pain for which she sees a pain specialist. Her temperature is 100.5°F (38.1°C), blood pressure is 102/78 mmHg, pulse is 127/min, respirations are 19/min, and oxygen saturation is 99% on room air. An ECG is performed as seen in Figure A. Which of the following findings is also likely to be present at some point in this patient’s course?