PO-02-096 USE OF ISOCHRONAL LATE ACTIVATION MAPPING OF THE CAVOTRICUSPID ISTHMUS TO PREDICT INDUCIBILITY OF TYPICAL ATRIAL FLUTTER

Isochronal late activation mapping (ILAM) was initially described in reentrant ventricular tachycardia to characterize the functional substrate responsible for arrhythmia propagation. Recently, this technique successfully applied atypical atrial flutter, but it has yet be prototypical arrhythmia: typical flutter (AFL). Our objective examine relationship between slow conduction cavotricuspid isthmus utilizing ILAM and presence of AFL. A cohort patients undergoing fibrillation (AF) AFL ablation at our institution with right atrium were included study. Right map performed by pacing proximal coronary sinus a cycle length 400 ms. Mapping using multipolar catheter Ensite Precision (Abbott) annotating latest signal on each pair bipoles. crowding present if more than 3 isochrones within 1 cm. After mapping, burst numerous lengths attempts induce Fifteen AF and/or had included. Of those, 14 (93%) 7 (47%) history respectively. 10 (67%) induced patients. Atrial inducible 71% 25% without All all isochronal ILAM. Only patient did not have or In limited case series, we report that every Furthermore, also even they no clinical