A multicentered evaluation of ablation at higher power guided by ablation index: Establishing ablation targets for pulmonary vein isolation

J Cardiovasc Electrophysiol. 2019 Mar;30(3):357-365. doi: 10.1111/jce.13813. Epub 2019 Jan 6.


Background: Pulmonary vein isolation (PVI) using high power delivered by SmartTouch Surround Flow (STSF) catheters guided by ablation index (AI) was evaluated in a multicenter registry.

Methods: Patients with paroxysmal AF underwent PVI with STSF catheters using 30 W on the posterior wall and 40 W elsewhere. AI targets were 350 posterior walls and 450 elsewhere. Procedures were compared with controls using conventionally irrigated contact force-sensing catheters using conventional powers (25 W posterior wall and 30 W elsewhere) guided by force-time integral (no agreed targets). The waiting period of 30 minutes was observed before adenosine administration to assess acute pulmonary vein (PV) reconnection.

Results: One hundred patients from four centers were included: 50 patients in the high power ablation index (HPAI) group and 50 controls. Procedure time was 22% shorter in the HPAI group (156 [133.8-179] vs 199 [178.5-227] minutes; P < 0.001). Duration of the radiofrequency application was 37% shorter in the HPAI group (27.2 [21.5-35.8] vs 43.2 [35.1-52.1] minutes; P < 0.001). Acute PV reconnection was reduced (28 of 200 [14%] vs 48 of 200 [24%] veins; P = 0.015). Reconnection was predicted by a largest interlesion distance greater than 6 mm, a lesion with impedance drop less than 2.5 Ω, contact force less than 6 g, or less than 68% of the regional AI target (all P < 0.001). Freedom from atrial arrhythmia at 1 year off antiarrhythmic drugs after a single procedure was 78% in the HPAI group vs 64% in the control group ( P = 0.186).

Conclusion: High-powered ablation guided by AI was safe and led to shorter procedure times with reduced acute PV reconnection compared with conventional ablation.

Keywords: ablation index; atrial fibrillation; pulmonary vein isolation.

Publication types

  • Multicenter Study
  • Observational Study

MeSH terms

  • Action Potentials
  • Atrial Fibrillation / diagnosis
  • Atrial Fibrillation / physiopathology
  • Atrial Fibrillation / surgery*
  • Case-Control Studies
  • Catheter Ablation / adverse effects
  • Catheter Ablation / methods*
  • England
  • Female
  • Heart Rate
  • Humans
  • Male
  • Operative Time
  • Pulmonary Veins / physiopathology
  • Pulmonary Veins / surgery*
  • Recurrence
  • Risk Factors
  • Time Factors
  • Treatment Outcome