An 74-year-old male patient with a history of non-ischemic cardiomyopathy with severe LV systolic dysfunction (LVEF of 20%), nonsustained polymorphic ventricular tachycardia, amiodarone-induced hyperthyroidism, and chronic renal failure is admitted to the Cardiology Department for an episode of decompensated heart failure, presenting aggravated dyspnea on exertion and at rest, and peripheral edema that had occurred during the past 7 days prior to his presentation to the hospital. His ECG recorded at admittance to the Cardiology Department is presented in Fig. 1.