Efficacy and safety of catheter ablation of VT using the QDOT Micro catheter: a propensity-matched dual-center comparison with the thermocool SmartTouch catheter

Abstract Funding Acknowledgements Type of funding sources: None. Background Catheter ablation is an increasingly used treatment option for patients with recurrent ventricular tachycardia (VT) or electrical storm (ES). The QDOT Micro (QDOT) (Biosense Webster) a novel radiofrequency catheter that was found to allow rapid and effective pulmonary vein isolation among atrial fibrillation. There no published data on the safety efficacy VT using catheter, few direct comparison different technologies in this setting. Purpose assess outcomes CA structural heart disease compare them those observed Thermocool Smarttouch (TC-ST, Biosense catheter. Methods we conducted dual-center, observational, prospective study enrolling VT/ES undergoing For comparison, performed 1:1 propensity score matching identify who underwent TC-ST nearest neighbor method. Propensity based gender, age, etiology disease, left ejection fraction, storm, number previous CAs VT. primary outcome freedom from VT, as assessed by implantable defibrillator (ICD) interrogation; in-hospital complications. Results Forty propensity-matched were included analysis (QDOT, n=20; TC-ST, n=20); baseline clinical characteristics are resumed Table. After median follow-up 7 months, survival free any measured 74 (95% CI, 57-97)% 69 51-93)% groups, respectively (log-rank p=0.54, Figure A), while ICD shocks 95 86-100)% versus 84 69-100)% p=0.26, B). major complications group, three (15%) had event (p=0.23; femoral pseudoaneurysm, n=1; cardiac tamponade, aortic cusp perforation, n=1). Conclusion In cohort ES, similar compared Interestingly, procedural suggesting device may be safe even most challenging patients.