Review Question - QID 101706

A 32-year-old female with a history of depression presents to the emergency department after a suspected ingestion. She is confused, reporting blurry vision, and responding to visual hallucinations. Vital signs are as follows:

Temperature: 98.9 degrees Farenheit (37.2 Celsius)
Heart Rate: 105 bpm
Blood Pressure: 90/65 mmHg
Respiratory Rate: 21 respirations per minute
O2 Saturation: 99% on room air

Upon reviewing her ECG (shown in Image A), the emergency room physician orders sodium bicarbonate. What medication was the likely cause of this patient's cardiac abnormality?