Your patient was hospitalized three days ago with a history of severe chest pain. In the initial emergency ECG, ST-segment depression and T wave inversion were observed in leads II, aVF, and V5-V6. Markers of cardiac ischemia were significantly increased. Cardiac catheterization on the day of admission was unremarkable.

You are now on-call. It is 6:30 am, and you are contacted by the nursing team. The patient is agitated, fearful, and sweating so profusely that it is difficult to record an ECG. The patient reports severe chest pain.