Scenario: After surviving a sudden cardiac arrest at home, a 68-year-old man was admitted to the cardiac intensive care unit (ICU). Pertinent history includes hypertension, atrial fibrillation (AF), and nonischemic heart failure with a functional ejection fraction of 35%. The patient was intubated in the field, and mechanical ventilation was started upon his hospital arrival. The initial level of high-sensitivity troponin T was 0.31 ng/L (normal <14 ng/L). It was decided to stabilize him before taking him to the cardiac catheterization laboratory to assess coronary perfusion to rule out myocardial ischemia as a cause of the cardiac arrest. The nurses noted that the patient had frequent premature ventricular contractions (PVCs) during monitoring. Shown below are 2 separate rhythm strips in leads II and V1 with an accompanying arterial blood pressure waveform. Panel A was recorded approximately 3 minutes before panel B. Panel B was recorded 15 hours after...

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