Multicentre randomised trial comparing contact force with electrical coupling index in atrial flutter ablation (VERISMART trial).

PLoS ONE. 2019;14(4):e0212903 DOI 10.1371/journal.pone.0212903


Journal Homepage

Journal Title: PLoS ONE

ISSN: 1932-6203 (Online)

Publisher: Public Library of Science (PLoS)

LCC Subject Category: Medicine | Science

Country of publisher: United States

Language of fulltext: English

Full-text formats available: PDF, HTML, XML



Gordon A Begg
James O'Neill
Afzal Sohaib
Ailsa McLean
Chris B Pepper
Lee N Graham
Andrew J Hogarth
Stephen P Page
Richard G Gillott
Nicola Hill
Jacqueline Walshaw
Richard J Schilling
Prapa Kanagaratnam
Muzahir H Tayebjee


Peer review

Editorial Board

Instructions for authors

Time From Submission to Publication: 24 weeks


Abstract | Full Text

INTRODUCTION:Electrical coupling index (ECI) and contact force (CF) have been developed to aid lesion formation during catheter ablation. ECI measures tissue impedance and capacitance whilst CF measures direct contact. The aim was to determine whether the presence of catheter / tissue interaction information, such as ECI and CF, reduce time to achieve bidirectional cavotricuspid isthmus block during atrial flutter (AFL) ablation. METHODS:Patients with paroxysmal or persistent AFL were randomised to CF visible (range 5-40g), CF not visible, ECI visible (change of 12%) or ECI not visible. Follow-up occurred at 3 and 6 months and included a 7 day ECG recording. The primary endpoint was time to bidirectional cavotricuspid isthmus block. RESULTS:114 patients were randomised, 16 were excluded. Time to bidirectional block was significantly shorter when ECI was visible (median 30.0 mins (IQR 31) to median 10.5mins (IQR 12) p 0.023) versus ECI not visible. There was a trend towards a shorter time to bidirectional block when CF was visible. Higher force was applied when CF was visible (median 9.03g (IQR 7.4) vs. 11.3g (5.5) p 0.017). There was no difference in the acute recurrence of conduction between groups. The complication rate was 2%, AFL recurrence was 1.1% and at 6 month follow-up, 12% had atrial fibrillation. CONCLUSION:The use of tissue contact information during AFL ablation was associated with reduced time taken to achieve bidirectional block when ECI was visible. Contact force data improved contact when visible with a trend towards a reduction in the procedural endpoint. trial identifier: NCT02490033.