777-4 Relationship Between Fluoroscopy Duration, Ablation Target, and Success During Catheter Ablation Procedures

Radiation exposure is an important risk during ablation (abl) procedures. To determine the relationship between the target arrhythmia, fluoroscopy time (fluoro), and the success of abl procedures we analyzed data from 450 patients in the Atakr multicenter clinical study(217 F, 233 M, 38±21 yrs). Target arrhythmias included AVNRT (154 pts), the AV junction (54 pts, AVJ), and 241 accessory pathway (APs).ResultsSimilar success was achieved during abl of APs, AVNRT. and the AVJ (93%, 98%, and 94% respectively, p>0.1). In contrast, fluoro time was greater during abl of APs than during abl of AVNRT or the AVJ (62±48, versus 31±29 & 36±24 min, p<0.05). Cumulative success of catheter abl of APs rose rapidly during the first 90 min of fluoro exposure and then plateaued. In contrast. cumulative success during abl of the AVJ and AVNRT plateaued after 40 and 70min.ConclSimilar success can be achieved during abl of APs, AVNRT. and the AVJ, but greater fluoro is needed during abl of APs. Resultant radiation risk should be considered when determining an appropriate termination point