Characteristics of Cavotricuspid Isthmus Ablation for Atrial Flutter Guided by Novel Parameters Using a Contact Force
Paul A Gould1,2, Cameron Booth2, Kieran Dauber2
1University of Queensland, School of Medicine, Queensland, Australia.
Insights
Contact force (CF) parameters safely guide cavotricuspid isthmus (CTI) ablation, showing similar long-term outcomes to traditional methods. Force Time Integral (FTI) may offer adjunctive insights for more efficient CTI ablation procedures.
Area of Science:
- Electrophysiology
- Cardiac Ablation
- Medical Device Technology
Background:
- Cavotricuspid isthmus (CTI) ablation is a key procedure for treating atrial flutter.
- Traditional CTI ablation relies on electrogram and impedance changes.
- Optimizing ablation parameters is crucial for procedural success and patient outcomes.
Purpose of the Study:
- To investigate specific contact force (CF) parameters for guiding CTI ablation.
- To compare the outcomes of CF-guided CTI ablation with a historical control group.
Main Methods:
- Prospective study of 30 patients undergoing CF-guided CTI ablation (CF >10 g, <40 g; FTI 800 ± 10 g).
- Comparison with a retrospective control cohort of 30 patients undergoing traditional CTI ablation.
- Assessment of bidirectional CTI block, atrial flutter recurrence, and major complications.
Main Results:
- Bidirectional CTI block achieved in 100% of the study cohort and 90% of the control cohort.
- Atrial flutter recurrence was 10% in both cohorts (follow-up 564 ± 212 days vs. 804 ± 540 days).
- Lower FTI and ablation duration were associated with flutter recurrence in the study cohort.
Conclusions:
- CTI ablation guided by CF parameters is safe and yields similar long-term results to historical controls.
- CF parameters may offer adjunctive information for more efficient CTI ablation.
- Further research is needed to confirm the role of CF parameters in optimizing CTI ablation.
Introduction:
This study sought to investigate specific contact force (CF) parameters to guide cavotricuspid isthmus (CTI) ablation and compare the outcome with a historical control cohort.
Methods And Results:
Patients (30) undergoing CTI ablation were enrolled prospectively in the Study cohort and compared with a retrospective Control cohort of 30 patients. Ablation in the Study cohort was performed using CF parameters >10 g and <40 g and a Force Time Integral (FTI) of 800 ± 10 g. The Control cohort underwent traditionally guided CTI ablation. Traditional parameters (electrogram and impedance change) were assessed in both cohorts. All ablations regardless of achieving targets were included in data analysis. Bidirectional CTI block was achieved in all of the Study and 27 of the Control cohort. Atrial flutter recurred in 3 (10%) patients (follow-up 564 ± 212 days) in the study cohort and in 3 (10%) patients (follow-up 804 ± 540 days) in the Control cohort. There were no major complications in either cohort. Traditional parameters correlated poorly with CF parameters. In the Study cohort, flutter recurrence was associated with significantly lower FTI and ablation duration, but was not associated with total average CF.
Conclusion:
CTI ablation can be safely performed using CF parameters guiding ablation, with similar long-term results to a historical ablation control group. Potentially CF parameters may provide adjunctive information to enable a more efficient CTI ablation. Further research is required to confirm this.
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