The Experts below are selected from a list of 300 Experts worldwide ranked by ideXlab platform
Erik Wissner - One of the best experts on this subject based on the ideXlab platform.
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in vivo contact force analysis and correlation with tissue impedance during left Atrial Mapping and catheter ablation of Atrial fibrillation
Circulation-arrhythmia and Electrophysiology, 2014Co-Authors: Hisaki Makimoto, Tina Lin, Andreas Rillig, Andreas Metzner, Peter Wohlmuth, Anita Arya, Matthias Antz, Shibu Mathew, Sebastian Deiss, Erik WissnerAbstract: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 14.0 g (6.5–26.2; q1–q3), ranging from 5.1 g at the ridge to 29.8 g at the roof. Median CF at the ridge and mitral isthmus were 5.1 g and 6.9 g , respectively. Extremely high CF ≥100 g was noted in 24 points (0.7%). Median CFs during ablation around the right and left pulmonary veins were 22.8 g (12.6–37.9; q1–q3) and 12.3 g (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 (7.2 g and 7.9 g ). Impedance values during Mapping and impedance fall during ablation correlated with the applied CF ( R 2=0.16; P <0.001 and R 2=0.04; P <0.001) although there was significant overlap. Conclusions— Excessively high and low CF values can be observed during left Atrial Mapping and ablation. The low CF obtained at the mitral isthmus and anterior segments of the left pulmonary veins may explain why reconnection after ablation occurs more frequently at these sites. CF and impedance do correlate; however, the impedance for a given CF ranges widely, limiting its use in clinical practice.
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In vivo contact force analysis and correlation with tissue impedance during left Atrial Mapping and catheter ablation of Atrial fibrillation.
Circulation. Arrhythmia and electrophysiology, 2013Co-Authors: Hisaki Makimoto, Tina Lin, Andreas Rillig, Andreas Metzner, Peter Wohlmuth, Anita Arya, Matthias Antz, Shibu Mathew, Sebastian Deiss, Erik WissnerAbstract: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 14.0 g (6.5–26.2; q1–q3), ranging from 5.1 g at the ridge to 29.8 g at the roof. Median CF at the ridge and mitral isthmus were 5.1 g and 6.9 g , respectively. Extremely high CF ≥100 g was noted in 24 points (0.7%). Median CFs during ablation around the right and left pulmonary veins were 22.8 g (12.6–37.9; q1–q3) and 12.3 g (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 (7.2 g and 7.9 g ). Impedance values during Mapping and impedance fall during ablation correlated with the applied CF ( R 2=0.16; P
Hisaki Makimoto - One of the best experts on this subject based on the ideXlab platform.
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in vivo contact force analysis and correlation with tissue impedance during left Atrial Mapping and catheter ablation of Atrial fibrillation
Circulation-arrhythmia and Electrophysiology, 2014Co-Authors: Hisaki Makimoto, Tina Lin, Andreas Rillig, Andreas Metzner, Peter Wohlmuth, Anita Arya, Matthias Antz, Shibu Mathew, Sebastian Deiss, Erik WissnerAbstract: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 14.0 g (6.5–26.2; q1–q3), ranging from 5.1 g at the ridge to 29.8 g at the roof. Median CF at the ridge and mitral isthmus were 5.1 g and 6.9 g , respectively. Extremely high CF ≥100 g was noted in 24 points (0.7%). Median CFs during ablation around the right and left pulmonary veins were 22.8 g (12.6–37.9; q1–q3) and 12.3 g (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 (7.2 g and 7.9 g ). Impedance values during Mapping and impedance fall during ablation correlated with the applied CF ( R 2=0.16; P <0.001 and R 2=0.04; P <0.001) although there was significant overlap. Conclusions— Excessively high and low CF values can be observed during left Atrial Mapping and ablation. The low CF obtained at the mitral isthmus and anterior segments of the left pulmonary veins may explain why reconnection after ablation occurs more frequently at these sites. CF and impedance do correlate; however, the impedance for a given CF ranges widely, limiting its use in clinical practice.
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In vivo contact force analysis and correlation with tissue impedance during left Atrial Mapping and catheter ablation of Atrial fibrillation.
Circulation. Arrhythmia and electrophysiology, 2013Co-Authors: Hisaki Makimoto, Tina Lin, Andreas Rillig, Andreas Metzner, Peter Wohlmuth, Anita Arya, Matthias Antz, Shibu Mathew, Sebastian Deiss, Erik WissnerAbstract: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 14.0 g (6.5–26.2; q1–q3), ranging from 5.1 g at the ridge to 29.8 g at the roof. Median CF at the ridge and mitral isthmus were 5.1 g and 6.9 g , respectively. Extremely high CF ≥100 g was noted in 24 points (0.7%). Median CFs during ablation around the right and left pulmonary veins were 22.8 g (12.6–37.9; q1–q3) and 12.3 g (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 (7.2 g and 7.9 g ). Impedance values during Mapping and impedance fall during ablation correlated with the applied CF ( R 2=0.16; P
Shibu Mathew - One of the best experts on this subject based on the ideXlab platform.
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High-Resolution Imaging of LA Anatomy Using a Novel Wide-Band Dielectric Mapping System: First Clinical Experience
JACC. Clinical electrophysiology, 2019Co-Authors: Tilman Maurer, Shibu Mathew, Michael Schlüter, Christine Lemes, Johannes Riedl, Osamu Inaba, Naotaka Hashiguchi, Bruno Reißmann, Thomas Fink, Laura RottnerAbstract:Abstract Objectives This study presents the first report of high-resolution imaging of cardiac anatomy using a novel system. Background Recently, the wide-band dielectric Mapping system Kodex was introduced. Methods This study included 20 consecutive patients with symptomatic Atrial fibrillation or left Atrial tachycardia who were scheduled for an ablation procedure and who underwent simultaneous left Atrial Mapping using the Kodex and CARTO 3 systems. Pulmonary vein angiograms served as a reference to compare the craniocaudal dimensions of the pulmonary vein ostia as depicted by either of the 2 Mapping systems. Results Complete left Atrial imaging was achieved within a median [first quartile; third quartile] of 9.7 [7.5; 12.8] min. Median procedure time was 97.5 [90; 112.5] min, and median total fluoroscopy time was 8.2 [5.7; 10.6] min, of which a median of 1.4 [1.1; 2.3] min were used during the creation of the left Atrial map. High-resolution representations of left Atrial anatomy were successfully created in all patients. Both the Kodex and CARTO measurements correlated well with fluoroscopy measurements, as reflected by Pearson’s correlation coefficients (r) of 0.91 and 0.95, respectively. Bland-Altman plots revealed that, on average, Kodex measurements underestimated fluoroscopy measurements by 0.04 mm (95% limits of agreement of –5.72 and 5.64 mm), and CARTO measurements underestimated fluoroscopy measurements by 0.02 mm (95% limits of agreement of –3.61 and 3.57 mm). Conclusions Anatomic Mapping of the left atrium using Kodex shows the potential to create computed tomography–like images without the need for additional periprocedural imaging.
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in vivo contact force analysis and correlation with tissue impedance during left Atrial Mapping and catheter ablation of Atrial fibrillation
Circulation-arrhythmia and Electrophysiology, 2014Co-Authors: Hisaki Makimoto, Tina Lin, Andreas Rillig, Andreas Metzner, Peter Wohlmuth, Anita Arya, Matthias Antz, Shibu Mathew, Sebastian Deiss, Erik WissnerAbstract: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 14.0 g (6.5–26.2; q1–q3), ranging from 5.1 g at the ridge to 29.8 g at the roof. Median CF at the ridge and mitral isthmus were 5.1 g and 6.9 g , respectively. Extremely high CF ≥100 g was noted in 24 points (0.7%). Median CFs during ablation around the right and left pulmonary veins were 22.8 g (12.6–37.9; q1–q3) and 12.3 g (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 (7.2 g and 7.9 g ). Impedance values during Mapping and impedance fall during ablation correlated with the applied CF ( R 2=0.16; P <0.001 and R 2=0.04; P <0.001) although there was significant overlap. Conclusions— Excessively high and low CF values can be observed during left Atrial Mapping and ablation. The low CF obtained at the mitral isthmus and anterior segments of the left pulmonary veins may explain why reconnection after ablation occurs more frequently at these sites. CF and impedance do correlate; however, the impedance for a given CF ranges widely, limiting its use in clinical practice.
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In vivo contact force analysis and correlation with tissue impedance during left Atrial Mapping and catheter ablation of Atrial fibrillation.
Circulation. Arrhythmia and electrophysiology, 2013Co-Authors: Hisaki Makimoto, Tina Lin, Andreas Rillig, Andreas Metzner, Peter Wohlmuth, Anita Arya, Matthias Antz, Shibu Mathew, Sebastian Deiss, Erik WissnerAbstract: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 14.0 g (6.5–26.2; q1–q3), ranging from 5.1 g at the ridge to 29.8 g at the roof. Median CF at the ridge and mitral isthmus were 5.1 g and 6.9 g , respectively. Extremely high CF ≥100 g was noted in 24 points (0.7%). Median CFs during ablation around the right and left pulmonary veins were 22.8 g (12.6–37.9; q1–q3) and 12.3 g (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 (7.2 g and 7.9 g ). Impedance values during Mapping and impedance fall during ablation correlated with the applied CF ( R 2=0.16; P
Hirofumi Yasue - One of the best experts on this subject based on the ideXlab platform.
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Linear Ablation of the Isthmus Between the Inferior Vena Cava and Tricuspid Annulus for the Treatment of Atrial Flutter A Study in the Canine Atrial Flutter Model
Circulation, 1995Co-Authors: Toshifumi Tabuchi, Ryusuke Tsunoda, Michihisa Jougasaki, Toshiro Matsunaga, Ken Okumura, Hirofumi YasueAbstract:Background The isthmus between the inferior vena cava and the tricuspid annulus has been shown to be involved in the reentry circuit of common Atrial flutter. The effects of radiofrequency catheter ablation of this isthmus were examined in the canine model of Atrial flutter due to reentry around the tricuspid annulus. Methods and Results A model of Atrial flutter was prepared in 11 of 14 dogs by creating intercaval and connected transverse lesions (Y-shaped lesion). Bipolar electrodes were attached at 24 Atrial sites, and computer-assisted Mapping was performed. Stable Atrial flutter with a cycle length of 133±11 ms was repeatedly induced by rapid Atrial pacing in all dogs, and Atrial Mapping revealed reentry around the tricuspid annulus including the isthmus. In 6 dogs, the isthmus was ligated during Atrial flutter (mechanical ablation). In the other 5 dogs, a 7F large-tip electrode catheter was placed at the isthmus under a fluoroscopic control. Radiofrequency energy (25 W for 30 s) was delivered to thr...
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Linear Ablation of the Isthmus Between the Inferior Vena Cava and Tricuspid Annulus for the Treatment of Atrial Flutter: A Study in the Canine Atrial Flutter Model
Circulation, 1995Co-Authors: Toshifumi Tabuchi, Ryusuke Tsunoda, Michihisa Jougasaki, Toshiro Matsunaga, Ken Okumura, Hirofumi YasueAbstract:The isthmus between the inferior vena cava and the tricuspid annulus has been shown to be involved in the reentry circuit of common Atrial flutter. The effects of radio-frequency catheter ablation of this isthmus were examined in the canine model of Atrial flutter due to reentry around the tricuspid annulus. A model of Atrial flutter was prepared in 11 of 14 dogs by creating intercaval and connected transverse lesions (Y-shaped lesion). Bipolar electrodes were attached at 24 Atrial sites, and computer-assisted Mapping was performed. Stable Atrial flutter with a cycle length of 133 +/- 11 ms was repeatedly induced by rapid Atrial pacing in all dogs, and Atrial Mapping revealed reentry around the tricuspid annulus including the isthmus. In 6 dogs, the isthmus was ligated during Atrial flutter (mechanical ablation). In the other 5 dogs, a 7F large-tip electrode catheter was placed at the isthmus under a fluoroscopic control. Radiofrequency energy (25 W for 30 s) was delivered to three sequential sites from the tricuspid annulus to the inferior vena cava to ablate the isthmus linearly. Atrial flutter was terminated in all dogs after mechanical and radio-frequency ablation of the isthmus and was not induced again. Atrial pacing from the posterior left atrium during sinus rhythm demonstrated intra-Atrial conduction block at the isthmus after ablation. Pathological examination of the isthmus showed transmural myocardial damage. Linear radiofrequency ablation of the isthmus can induce intra-Atrial conduction block and is effective as a curative therapy for Atrial flutter when the reentry circuit involves the isthmus.
Peter Wohlmuth - One of the best experts on this subject based on the ideXlab platform.
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in vivo contact force analysis and correlation with tissue impedance during left Atrial Mapping and catheter ablation of Atrial fibrillation
Circulation-arrhythmia and Electrophysiology, 2014Co-Authors: Hisaki Makimoto, Tina Lin, Andreas Rillig, Andreas Metzner, Peter Wohlmuth, Anita Arya, Matthias Antz, Shibu Mathew, Sebastian Deiss, Erik WissnerAbstract: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 14.0 g (6.5–26.2; q1–q3), ranging from 5.1 g at the ridge to 29.8 g at the roof. Median CF at the ridge and mitral isthmus were 5.1 g and 6.9 g , respectively. Extremely high CF ≥100 g was noted in 24 points (0.7%). Median CFs during ablation around the right and left pulmonary veins were 22.8 g (12.6–37.9; q1–q3) and 12.3 g (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 (7.2 g and 7.9 g ). Impedance values during Mapping and impedance fall during ablation correlated with the applied CF ( R 2=0.16; P <0.001 and R 2=0.04; P <0.001) although there was significant overlap. Conclusions— Excessively high and low CF values can be observed during left Atrial Mapping and ablation. The low CF obtained at the mitral isthmus and anterior segments of the left pulmonary veins may explain why reconnection after ablation occurs more frequently at these sites. CF and impedance do correlate; however, the impedance for a given CF ranges widely, limiting its use in clinical practice.
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In vivo contact force analysis and correlation with tissue impedance during left Atrial Mapping and catheter ablation of Atrial fibrillation.
Circulation. Arrhythmia and electrophysiology, 2013Co-Authors: Hisaki Makimoto, Tina Lin, Andreas Rillig, Andreas Metzner, Peter Wohlmuth, Anita Arya, Matthias Antz, Shibu Mathew, Sebastian Deiss, Erik WissnerAbstract: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 14.0 g (6.5–26.2; q1–q3), ranging from 5.1 g at the ridge to 29.8 g at the roof. Median CF at the ridge and mitral isthmus were 5.1 g and 6.9 g , respectively. Extremely high CF ≥100 g was noted in 24 points (0.7%). Median CFs during ablation around the right and left pulmonary veins were 22.8 g (12.6–37.9; q1–q3) and 12.3 g (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 (7.2 g and 7.9 g ). Impedance values during Mapping and impedance fall during ablation correlated with the applied CF ( R 2=0.16; P