However, in some patients, we could not rule out a macroreentry
in the vein or a slow conduction from the LA into a second PV fascicle may be the responsible mechanism because the second potential disappeared and never occurred again during the ostial ablation.
Parasympathetic effects tend to favor macroreentry
phenomena, whereas sympathetic ones favor abnormal automaticity and triggered activity .
In parallel, atrial tachycardia (AT) has become the most common type of arrhythmia after AF ablation, especially after extensive left atrial (LA) substrate modification.[sup] The occurrence of AT after AF is due to the conduction gaps of ablation lines and the conduction obstacle caused by the ablation lesions.[sup] Most of these ATs locate in LA, and here, we described a biatrial macroreentry
AT (MAT) after AF ablation.
The activation sequence achieved in PVA showed a macroreentry
rotating around the TV clockwise.