Low doses of intravenous epinephrine for refractory sustained monomorphic ventricular tachycardia

Figure 4 Electrocardiogram tracings from a 64-year-old man with ischemic dilated cardiomyopathy with an implanted cardioverter-defibrillator, on chronic treatment with bisoprolol and amiodarone (patient 2). A: Ten-lead electrocardiogram (ECG) at admission with sustained ventricular tachycardia (VT) at 140 beats/min with a left bundle branch block morphology and right axis deviation, blood pressure was 85/50 mmHg; B: Twelve-lead ECG 30 s after intravenous epinephrine bolus (0.5 mg over 30 s) shows sinus rhythm with pathologic Q waves in inferior leads. VT termination was preceded by a slight increase in VT rate from 140 to 148 beats/min (not shown).