Abstract
Atrial remodeling plays a key role in development of the substrate for atrial fibrillation (AF). Whether the wall thicknesses of the left atrium (LA) and pulmonary vein (PV)-LA junction affect remodeling and AF ablation is unknown. We investigated the relationship between wall thicknesses, electrogram characteristics, and adenosine triphosphate (ATP)-provoked dormant PV conduction as they pertain to AF. In 50 patients with AF and 25 patients without AF, wall thicknesses of the LA and PV-LA junction were measured on 320-slice computed tomography images. For the AF patients, NavX-based voltage maps generated during sinus rhythm were obtained, and ATP-provoked dormant PV conduction after PV isolation was evaluated. Walls of the LA and PV-LA junction were significantly thicker in the AF patients than in the control patients (1.83 ± 0.29 mm vs. 1.59 ± 0.28 mm, respectively; P = 0.0010; and 0.88 ± 0.14 mm vs. 0.65 ± 0.11 mm, P<0.0001, respectively). Wall thickness at the PV-LA junction was independently associated with AF (β = 0.40, P = 0.0002). In AF patients, the walls of the PV-LA junction showed stepwise thickening across bipolar voltages indicative of severe (bipolar voltage <33rd percentile) to moderate (33rd-66th percentiles) ...Continue Reading
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