Abstract
cavo-tricuspidal isthmus (CTI) block assessment using right ventricular (RV) pacing in pts with ventriculo-atrial conduction. pts submitted to CTI ablation for typical atrial flutter were studied with a quadruple catheter in RV, a decapolar in the coronary sinus (CS), an eicosapolar around the tricuspidal annulus and an 8 mm ablator. Circumannular activation (CA) was analysed during CS and RV pacing in pts with spontaneous sinus rhythm or cardioverted during ablation. Pts without ventriculo-atrial conduction were excluded. The linear lesion was performed during RV pacing, looking at atrial signals splitting. CTI block was confirmed by analysis of CA during CS and RV pacing. out of 15, 9 (60%) pts were included. Before ablation, during RV stimulation, the collision front of CA shifted counter clockwise with respect to CS pacing, without variation of Halo-like catheter activation time (82±31 ms vs 77±26, p = 0.49). After ablation, CA was similar during CS and RV pacing, showing fully descending lateral right atrium activation (115±33 ms vs. 103±29, p = 0.09). Double potentials on the ablation line were more splitted during CS pacing than RV pacing (126±24 ms vs. 108±20 ms, p = 0.009), but less detached from the V wave. All pts were successfully ablated. in pts with ventriculo-atrial conduction, RV pacing can substitute CS pacing in the assessment of isthmus block.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
