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Additional Evidence for Re‐entry Within the Bundle Branches in Man

A repetitive, non‐paced ventricular beat (V3) often occurs during ventricular extrastimulus testing at short coupling intervals when critical retrograde His‐Purkinye conduction delay is achieved. Though re‐entry within the bundle, branches has been proposed as the mechanism for V3. it has been difficult to exclude local re‐entry. In the present case, we consistently recorded a right bundle branch potential as well as a bundle of His potential before each V3. The anterogrude activation sequence of these potentials provides evidence against local reentry and supports re‐entry involving the bundle branches as the mechanism for V3.