AIMS: The mini electrodes (ME) placed on the tip of the ablation electrode provide more precise local signal. We evaluated whether ME catheter was effective for the ablation of cavotricuspid isthmus (CTI)-dependent atrial flutter. METHODS AND RESULTS: Eighty-five consecutive patients (68 men; 62 ± 10 years) underwent CTI ablation either using a catheter equipped with ME on the 8 mm tip (ME catheter) in 25 patients (Group A), 8 mm dumbbell-shaped (DS) tip catheter (DS catheter) in 30 patients (Group B), or 8 mm tip cryothermal catheter (Cryo catheter) in 30 patients (Group C). In cases of failed isthmus block, the catheter was changed to the other catheter, but patients remained in the original group following intention-to-treat analysis. The endpoint was achieved in all patients after 13 ± 7 applications in Group A, 9 ± 4 applications in Group B, and 5 ± 2 applications in Group C (P < 0.001). The fluoroscopic and procedure times were significantly longer in Group A (9 ± 7 and 28 ± 17 min, P = 0.001, and P = 0.002, respectively) when compared with Groups B (6 ± 4 and 13 ± 6 min) and C (4 ± 3 and 14 ± 7 min). A crossover was performed in 14 (56%) Group A patients, and 3 (10%) Group C patients. The mean power delivered in Group A was significantly lower than in Group B (31.3 ± 9.1 vs. 38.6 ± 7.6 W, P = 0.015). CONCLUSION: The ME catheter was found to be less effective than the Cryo catheter and a DS catheter for the CTI ablation. Published on behalf of the European Society of Cardiology. All rights reserved.
AIMS: The mini electrodes (ME) placed on the tip of the ablation electrode provide more precise local signal. We evaluated whether ME catheter was effective for the ablation of cavotricuspid isthmus (CTI)-dependent atrial flutter. METHODS AND RESULTS: Eighty-five consecutive patients (68 men; 62 ± 10 years) underwent CTI ablation either using a catheter equipped with ME on the 8 mm tip (ME catheter) in 25 patients (Group A), 8 mm dumbbell-shaped (DS) tip catheter (DS catheter) in 30 patients (Group B), or 8 mm tip cryothermal catheter (Cryo catheter) in 30 patients (Group C). In cases of failed isthmus block, the catheter was changed to the other catheter, but patients remained in the original group following intention-to-treat analysis. The endpoint was achieved in all patients after 13 ± 7 applications in Group A, 9 ± 4 applications in Group B, and 5 ± 2 applications in Group C (P < 0.001). The fluoroscopic and procedure times were significantly longer in Group A (9 ± 7 and 28 ± 17 min, P = 0.001, and P = 0.002, respectively) when compared with Groups B (6 ± 4 and 13 ± 6 min) and C (4 ± 3 and 14 ± 7 min). A crossover was performed in 14 (56%) Group A patients, and 3 (10%) Group C patients. The mean power delivered in Group A was significantly lower than in Group B (31.3 ± 9.1 vs. 38.6 ± 7.6 W, P = 0.015). CONCLUSION: The ME catheter was found to be less effective than the Cryo catheter and a DS catheter for the CTI ablation. Published on behalf of the European Society of Cardiology. All rights reserved.
Authors: Matthew K Rowe; Andrew Claughton; Jason Davis; Lauren Yee; Gerald C Kaye; Kieran Dauber; John Hill; Paul A Gould Journal: J Arrhythm Date: 2021-12-09