In vivo contact force analysis and correlation with tissue impedance during left atrial mapping and catheter ablation of atrial fibrillation

  • Makimoto H
  • Lin T
  • Rillig A
 et al. 
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BACKGROUND: The aim of this study was to evaluate in vivo contact force (CF) and the correlation of CF with impedance during left atrial 3-dimensional electroanatomical mapping and ablation. METHODS AND RESULTS: CF during point-by-point left atrial mapping was assessed in 30 patients undergoing atrial fibrillation ablation. Operators were blinded to the real-time CF data. Data were analyzed according to 11 predefined areas in the left atrial and 6 segments around the ipsilateral pulmonary veins. A total of 3475 mapping and 878 ablation points were analyzed. Median CF during mapping was 14.0g (6.5-26.2; q1-q3), ranging from 5.1g at the ridge to 29.8g at the roof. Median CF at the ridge and mitral isthmus were 5.1g and 6.9g, respectively. Extremely high CF >/=100g was noted in 24 points (0.7%). Median CFs during ablation around the right and left pulmonary veins were 22.8g (12.6-37.9; q1-q3) and 12.3g (6.9-30.2; q1-q3), respectively. The lowest median CFs were recorded at the anterior-superior and anterior-inferior segments of the left pulmonary veins (7.2g and 7.9g). Impedance values during mapping and impedance fall during ablation correlated with the applied CF (R(2)=0.16; P

Author-supplied keywords

  • Atrial fibrillation
  • Catheter ablation
  • Contact force
  • Left atrial mapping
  • Pulmonary vein isolation

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  • Hisaki Makimoto

  • Tina Lin

  • Andreas Rillig

  • Andreas Metzner

  • Peter Wohlmuth

  • Anita Arya

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