Abstract 15771: Impact of Contact Force Visualization During Left Atrial Mapping
Background: The aim of this study was to evaluate the impact of contact force (CF) visualization on the incidence of low and high CF values during left atrial (LA) mapping.
Methods: CF during point-by-point LA mapping were assessed in combination with a 3D electroanatomic mapping system in 80 patients. Each mapping point was acquired after at least 2 seconds of stable catheter placement. Operators were blinded to the CF during the procedure in group-A (35 patients), and CF was displayed to operators in group-B (45 patients). As a parameter of catheter stability, relative standard deviation (RSD=standard deviation of CF*100/mean CF) was calculated at each mapping point. Data were analyzed according to 11 predefined areas (Figure ). In group-B, optimal CF was defined as mean CF of 10-40g, and operators attempted to acquire points (pts) within this optimal range. We compared CF and catheter stability between the two groups.
Results: A total of 9578 mapping pts were analyzed (group-A: 4104 pts, group-B: 5474 pts). Mean CF in group-A and -B was 19.5±19.3g and 18.1±9.0g, respectively (P<.001). Low CF<10g was observed at 1546 pts (38%) in group-A and 719 pts (13%) in group-B (P<.001) (Figure ). High CF>40g in group-A and -B was noted at 471 pts (11%) and 89 pts (2%; P<.001) whilst extremely high CF>100g was noted exclusively in group-A (25 pts; 0.6%). RSD was significantly higher in group-A than in group-B (32% vs 28%, P<.001), suggesting better catheter stability in group-B. In the mitral isthmus and ridge areas, CF was significantly lower (10±9g vs 14±7g, P<.001; 9±13g vs 13±8g, P<.001) and RSD was higher (38% vs 31%, P<.001; 38% vs 28%, P<.001) in group-A than in group-B.
Conclusions: During LA mapping blinded to CF, high and low CF was noted in approximately 50% of mapped pts. CF guided mapping resulted in a significant lower number of pts with high and low CF. Therefore, CF guided mapping and ablation may help to avoid complications as well as ineffective lesion formation.
- © 2013 by American Heart Association, Inc.