Abstract
Mapping accessory pathways (AP) via earliest ventricular activation during atrial fibrillation (AF) is challenging. Open-window mapping (OWM) is a well-known approach by which the sharpest local bipolar electrogram (EGM) deflections (absolute dV/dt) are annotated without regard to their chamber of origin; therefore, the need for an operator to decipher point-by-point whether a signal arises from the atrium, AP, or ventricle is obviated. OWM in incessant AF has not been described.
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