title: Pulmonary vein isolation using new technologies to improve ablation lesion formation: Initial results comparing enhanced catheter tip irrigation (Surround Flow(®)) with contact force measurement (Smarttouch(®)).
abstract: BACKGROUND
  Pulmonary vein reconnection after pulmonary vein isolation (PVI) is a significant problem in the treatment of paroxysmal atrial fibrillation (AF). We report about patients who underwent contact force (CF) guided PVI using CF catheter and compared them to patients with PVI using an ablation catheter with enhanced tip irrigation.
  
  
  METHODS
  A total of 59 patients were included in the analysis. In 30 patients circumferential PVI was performed using the Thermocool Smarttouch(®) ablation catheter (ST) whereas in 29 patients circumferential PVI using the Thermocool Surround Flow SF(®) ablation catheter (SF) was performed. Patients were compared in regard to procedure time, fluoroscopy time/dose as well as RF-application duration and completeness of PVI. Adverse events (pericardial effusion, PV stenosis, stroke, death) were evaluated. The presence of sinus rhythm off antiarrhythmic medication was assessed during 6 months follow-up using multiple 7 day Holter-ECGs.
  
  
  RESULTS
  In both groups, all PVs were isolated without serious adverse events. Procedure time was 2.15 ± 0.5 h (ST) vs. 2.37 ± 1.13 h (SF) (p = 0.19). Duration of RF-applications was 46.6 ± 18 min (ST) and 49.8 ± 19 min (SF) (p = 0.52). Fluoroscopy time was 25.2 ± 13 min (ST) vs. 29 ± 18 min (SF), fluoroscopy dose 2675.6 ± 1658 versus 3038.3 ± 1997 cGym(2) (p = 0.36 and 0.46 respectively). Sinus rhythm off antiarrhythmic medication validated with 7 day Holter ECGs was present in both groups in 72% of patients after 6 months of follow up.
  
  
  CONCLUSIONS
  PVI using the new contact force catheter is safe and effective in patients with paroxysmal AF.
authors.affiliation: Klinikum der Universität München, Medizinische Klinik I, München, Germany.
authors.forename: Stephanie
authors.initials: S
authors.lastname: Fichtner
authors.affiliation: Deutsches Herzzentrum München, Germany; Med. Klinik Klinikum Rechts der Isar der Technischen Universität München, Germany.
authors.forename: Tilko
authors.initials: T
authors.lastname: Reents
authors.affiliation: Deutsches Herzzentrum München, Germany; Med. Klinik Klinikum Rechts der Isar der Technischen Universität München, Germany.
authors.forename: Sonia
authors.initials: S
authors.lastname: Ammar
authors.affiliation: Deutsches Herzzentrum München, Germany; Med. Klinik Klinikum Rechts der Isar der Technischen Universität München, Germany.
authors.forename: Verena
authors.initials: V
authors.lastname: Semmler
authors.affiliation: Deutsches Herzzentrum München, Germany; Med. Klinik Klinikum Rechts der Isar der Technischen Universität München, Germany.
authors.forename: Susanne
authors.initials: S
authors.lastname: Kathan
authors.affiliation: Deutsches Herzzentrum München, Germany; Med. Klinik Klinikum Rechts der Isar der Technischen Universität München, Germany.
authors.forename: Roger
authors.initials: R
authors.lastname: Dillier
authors.affiliation: Deutsches Herzzentrum München, Germany; Med. Klinik Klinikum Rechts der Isar der Technischen Universität München, Germany.
authors.forename: Alexandra
authors.initials: A
authors.lastname: Buiatti
authors.affiliation: Deutsches Herzzentrum München, Germany; Med. Klinik Klinikum Rechts der Isar der Technischen Universität München, Germany.
authors.forename: Gabriele
authors.initials: G
authors.lastname: Hessling
authors.affiliation: Deutsches Herzzentrum München, Germany; Med. Klinik Klinikum Rechts der Isar der Technischen Universität München, Germany.
authors.forename: Isabel
authors.initials: I
authors.lastname: Deisenhofer
keywords: Ablation; Atrial fibrillation, AF; Contact force; Smarttouch; Surround flow