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Updated: Jun 15, 2026

High-Resolution Endocardial and Epicardial Optical Mapping in a Sheep Model of Stretch-Induced Atrial Fibrillation
Published on: July 29, 2011
Unusual fascicular extrasystoles: where is the site of origin?
Alicia Montanez1, Michael Shehata, Timothy Yeh
1Cedars-Sinai Medical Center, The Heart Institute, 8700 Beverly Blvd, Suite 5539, Los Angeles, CA, USA.
Abstract:
Radiofrequency ablation for symptomatic, drug refractory premature ventricular contractions has been well established as a treatment modality. Mapping of ventricular ectopy that arises near the native conduction system can be challenging. We report a case of fascicular ectopy arising from the proximal His (H)-Purkinje system that was successfully mapped and ablated. The use of surface and intracardiac electrograms and timing of the His bundle and/or Purkinje potentials is crucial in identifying the exact site of origin.
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