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  • Title: Repetitive polymorphic ventricular tachycardia initiated by phase 4 block in the His-Purkinje system.
    Author: Dizon J, Wang D, Vainrib A.
    Journal: J Electrocardiol; 2010; 43(5):415-7. PubMed ID: 20096856.
    Abstract:
    We report a case of a patient who developed repetitive episodes of polymorphic ventricular tachycardia with a stereotypical pattern of initiation. A premature atrial complex would result in a brief pause followed by left bundle branch block aberrancy. Ventricular bigeminy would ensue followed by episodes of polymorphic ventricular tachycardia, some requiring cardioversion. We postulate that delay within the His-Purkinje system initiated by phase 4 block was proarrhythmic in this patient.
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