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. 2022 Nov 3;6:101593. doi: 10.1016/j.jaccas.2022.08.010

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This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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Initial Tachycardia Induction With Subsequent Ventriculoatrial Block

(A) Induction of tachycardia after critical atrial-His interval prolongation during programmed atrial extrastimulation. The initial beat of tachycardia had a narrow QRS complex before transition to a left bundle branch block configuration. (B) During tachycardia with a left bundle branch block configuration, ventriculoatrial block occurred spontaneously before termination of tachycardia was observed. CS = coronary sinus; d = distal; HRA = high right atrium; m = mid; p = proximal; RV = right ventricle.