A 61-year-old man was admitted for intermittent chest pain, which lasted for over one week. It worsened on exertion and was associated with diaphoresis. The pain was described as a central squeezing sensation that lasted for about ten minutes and was relieved with rest. Cardiovascular examination of the patient was unremarkable, and he was normotensive at rest.What are the electrocardiographic (ECG) abnormalities seen in Fig. 1?
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