PO-01-106 ATRIAL ISOCHRONAL LATE ACTIVATION MAPPING KEEPS THE DIAPHRAGM ALIVE

Isochronal late activation mapping (ILAM) is a well-established method for ventricular arrhythmias. However, the role of ILAM during atrial arrhythmias less clear. This case provides an example use right flutter ablation using high-density Optrell (Biosense Webster, CARTO) catheter in patient with congenital heart disease. N/A A 27-year-old female D-transposition great arteries status post Nikaidoh (arterial switch operation septal defect repair, pulmonary valve replacement, and typical presented SVT was referred ablation. During EPS, conventional fleeting attempted utilizing catheter, which localized region interest to large section inferior posterolateral RA, also had diffuse phrenic nerve capture (figure 1, panel A). periods sinus rhythm, voltage conducted that demonstrated distinct, confined, isochronal crowding along mid-posterolateral atrium, distant from B). The site addressed rendering non-inducible preservation function. has remained free 6 months period since application tachycardia, however, its may be especially useful adults disease given complexity arrhythmia benefit this unique population. Novel catheters, such as Optrell, allow rapid granular data translate well regions within atrium. Application substrate, particularly predisposes higher recurrence rates, improve both rates safety, like where allowed avoiding on nerve.