A previously healthy smoker presented with severe chest pain to the emergency department. On arrival, he was clinically stable. The ECG showed ST-segment elevation in the anterior leads, and the blood test showed elevated troponin T and CK-MB. The echocardiograph showed hypokinesia in the anteroseptal region. In the emergency department, his symptoms progressively worsened with ongoing intense chest pain, and he became increasingly restless and breathless.