Abstract
Bundle branch reentrant (BBR) ventricular tachycardia (VT) is a macroreentrant VT with a well-defined reentry circuit, incorporating the right and left bundle branches as obligatory limbs of the circuit, connected proximally by the His bundle and distally by the ventricular septal myocardium. The QRS during BBR VT can display either left bundle branch block or right bundle branch block when anterograde ventricular activation occurs over the right or left bundle, respectively. The vast majority of BBR VTs exhibit left bundle branch block configuration (“counterclockwise” BBR). Interfascicular reentry incorporates the left anterior and posterior fascicles as obligatory limbs of the circuit, connected proximally by the main trunk of the left bundle and distally by the ventricular myocardium. VT secondary to interfascicular reentry is extremely rare.
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