Abstract 17423: Identifying Left Ventricular Origin of Premature Ventricular Contractions Based on a Characteristic "Teton Sign" QRS on Ambulatory Holter Monitoring

Introduction: Premature ventricular contractions (PVCs) frequently originate from the outflow tract of the right ventricle (RVOT) or left ventricle (LVOT). Catheter-based mapping and ablation of RVOT PVCs employs simple venous access, while LVOT PVCs often require arterial access and more extensive mapping of the aorta, coronary cusps, and coronary venous system. Pre-procedural determination of PVC origin could direct an operator to the appropriate anatomical site and significantly improve procedure times, success rates, and patient safety. Detailed analyses of leads V1 and V2 on a 12-lead ECG are helpful in this regard, but results are strongly dependent on accurate placement of those leads. A particular type of QRS morphology, composed of a broad base and early slurring with terminal sharp activation, has been observed on ambulatory Holter monitors. We have designated this pattern the “Teton Sign” (ARROWS ON ACCOMPANYING IMAGE). It is observed independent of specific lead location. Hypothesis: The chara...