Arrhythmias & electrophysiology
Focal atrial tachycardias originating from the aorta-mitral continuity: Anatomical and electrophysiological characteristics
Authors' conclusion
A new strategy for mapping AMC ATs has been introduced. The ablation target should have an atrial-to-ventricular ratio of >1.
Study context
- Population
- Patients with focal atrial tachycardias originating from the aorta-mitral continuity21 (3.2%) AMC atrial tachycardias (ATs)
- Participants
- 650 patients
- Exposure
- AMC ATs vs controls without atrial arrhythmias
- AMC ATsn = 21
- Controln = 40reference
- Outcome
- Characteristics of AMC ATs
Methodological detailsobservational study, ECG, electrophysiology study, CT and intracardiac echocardiography performed
- Observational study
- ECG, electrophysiology study, CT and intracardiac echocardiography performed
Main finding
As reported in the abstract
- ATs occurring spontaneously
- 19, 90.5%
- Mean age (years)
- 48.9 ± 21.6
- Female
- 12 (57.1%)
- Typical biphasic P wave with prominent positive component
- 17
- Earliest RA activation near His bundle, preceding P wave (ms)
- −10.3 ± 6.0
- Successful ablation targets: 9 o'clock / 10 o'clock / 11 o'clock / 12 o'clock / left coronary cusp
- 1 / 6 / 7 / 6 / 1
Observational data: associations, not effects.
Further findings
Mean, °
| Outcome | AMC ATs | Control | P value |
|---|---|---|---|
| Angle of encroachment on left atrial anterior wall (compressed by left coronary cusp)Significantly smaller in AMC ATs | 141.7 (SD 11.5°) | 155.2 (SD 13.9°) | P = 0.026 |
Original publication
Focal atrial tachycardias originating from the aorta-mitral continuity: Anatomical and electrophysiological characteristics. Heart Rhythm. Published 6 April 2024. doi:10.
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