ECG of the Month: Chest Pain and Tachycardia

A 51-year-old man with a past medical history of myelodysplastic syndrome, chronic graft vs. host disease, status post allogeneic stem cell transplantation, non-obstructive coronary artery disease and pulmonary embolism presents to the emergency department with complaint of chest pain. Electrophysiology was consulted for an abnormal ECG, which is shown below.

Figure 1

The ECG shows which of the following?

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