Abstract
Purpose
This study aims to describe a novel method of High Density Activation Sequence Mapping combined with Voltage Gradient Mapping Overlay (HD-VGM) to quickly localize and terminate atypical atrial flutter.
Methods
Twenty-one patients presenting with 26 different atypical atrial flutter circuits after a previous catheter or surgical AF ablation were studied. HD-VGM was performed with a commercially available impedance-based mapping system to locate and successfully ablate the critical isthmus of each tachycardia circuit. The results were compared to 21 consecutive historical control patients who had undergone an atypical flutter ablation without HD-VGM.
Results
Twenty-six different atypical flutter circuits were evaluated. An average 3D anatomic mapping time of 12.39 ± 4.71 min was needed to collect 2996 ± 690 total points and 1016 ± 172 used mapping points. A mean of 195 ± 75 s of radiofrequency (RF) energy was needed to terminate the arrhythmias. The mean procedure time was 135 ± 46 min. With a mean follow-up 16 ± 9 months, 90% are in normal rhythm. In comparison to the control cohort, the study cohort had a shorter procedure time (135 ± 46 vs. 210 ± 41 min, p = 0.0009), fluoroscopy time (8.5 ± 3.7 vs. 17.7 ± 7.7 min, p = 0.0021), and success in termination of the arrhythmia during the procedure (100 vs. 68.2%, p = 0.0230).
Conclusions
Ablation of atypical atrial flutter is challenging and time consuming. This case series shows that HD-VGM mapping can quickly localize and terminate an atypical flutter circuit.
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Abbreviations
- AF:
-
Atrial fibrillation
- PAF:
-
Paroxysmal atrial fibrillation
- pAF:
-
Persistent atrial fibrillation
- HD-VGM:
-
High Density Activation Sequence Mapping with Voltage Gradient Mapping Overlay
- aAFL:
-
Atypical atrial flutter
- LA:
-
Left atrium
- RA:
-
Right atrium
- CS:
-
Coronary Sinus
- LAT:
-
Local activation timing
- RAI:
-
Roving activation interval
- LVID:
-
Low-V ID
- ACT:
-
Activated clotting time
- ICE:
-
Intracardiac echo
- LSI:
-
Lesion size index
- FTI:
-
Force Time Integral
- RF:
-
Radiofrequency
- CAFÉ:
-
Complex atrial fractionated electrograms
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Acknowledgments
The authors thank Ms. Kim Oaks for the editorial assistance and Ms. Manya Harsch for the statistical assistance.
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This study was approved by our local institutional review board.
Conflict of interest
Drs. Sundaram and Choe are on the speaker’s bureau for St. Jude Medical. In addition, Drs. Sundaram and Choe have received a research grant from St. Jude Medical, Asia Division, to study the genetic basis of Brugada Syndrome in Cambodia. This conflict is not relevant to the article. N. Mullins and C. Boorman receive salary support from St. Jude Medical.
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Sundaram, S., Choe, W., Ryan Jordan, J. et al. Catheter ablation of atypical atrial flutter: a novel 3D anatomic mapping approach to quickly localize and terminate atypical atrial flutter. J Interv Card Electrophysiol 49, 307–318 (2017). https://doi.org/10.1007/s10840-017-0269-z
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DOI: https://doi.org/10.1007/s10840-017-0269-z