Q. A 35-year-old female was admitted to the emergency department yesterday following a motor vehicle accident. She was a passenger in the car and sustained minor injuries, including abrasions and a sprained ankle. The patient has no significant past medical history and is not on any medications. She has no known allergies. This morning, the patient was informed that her spouse, who was driving the car, died in the accident. She became inconsolable, and a short time later reported a dull, achy pain in the left side of her chest that radiated to her left arm. The pain was described as a pressure-like sensation and was not associated with any shortness of breath or diaphoresis. On physical examination, the patient is alert and oriented but appears visibly upset and tearful. She has no signs of trauma or injury other than the abrasions and sprained ankle. Her vital signs are within normal limits. You order an electrocardiogram (see image). Based on the information you have at this point in time, which of the following is the most likely underlying cause of this patient’s symptoms?