A 41-year-old woman with ...

A 41-year-old woman presented with chest pain that started suddenly one day ago, along with shortness of breath and sweating. She has no known underlying comorbidities. Her troponin T level is elevated at 2000. On the first day, an echocardiogram revealed overall reduced potassium levels and a left ventricular ejection fraction (LVEF) of 30%. On the second day, a repeat echocardiogram showed a normal LVEF with no regional wall motion abnormalities (RWMA). An electrocardiogram (ECG) is attached. What is the likely diagnosis for this patient's condition?