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Mindy Vroomen, MD, Mark La Meir, MD, Harry J

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1 Absence of exit block due to direct capture of the left atrial appendage: A visual confirmation 
Mindy Vroomen, MD, Mark La Meir, MD, Harry J. Crijns, MD, PhD, Laurent Pison, MD, PhD  HeartRhythm Case Reports  Volume 2, Issue 3, Pages (May 2016) DOI: /j.hrcr Copyright © 2016 Heart Rhythm Society Terms and Conditions

2 Figure 1 Left-sided thoracoscopic view and signals on the Lasso catheter. A: Left atrial appendage (LAA) on top of the left superior pulmonary vein (LSPV). B: Pacing from the Lasso catheter from dipole 2–3 resulted in what seemed to be local capture in the pulmonary vein and conduction to the left atrium (arrow). C: Visualization of the Lasso catheter (dashed line) at the ostium of the LSPV (asterisk). D: Local signals disappear on the Lasso catheter tracings, proving that the apparent absence of exit block was due to direct capture of the LAA. HeartRhythm Case Reports 2016 2, DOI: ( /j.hrcr ) Copyright © 2016 Heart Rhythm Society Terms and Conditions

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