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Frequent fascicular-Purkinje activity in left ventricle. Frequent fascicular-Purkinje activity (arrows) preceding the premature ventricular contractions was recorded during sinus rhythm in the left ventricle. The ablation catheter (ABL) was positioned at the proximal region of the left bundle. Some fascicular-Purkinje activity was blocked.
HRA, high right atrium catheter; A, atrial potential; H, His potential.
