5. Atrial Tachycardia, Atrial Flutter & WPW Syndrome: 5.3 Lateral Line Versus Septal Line for Ablation of Isthmus Dependent Atrial Flutter - Efficacy, Safety

Abstract

We ablated 26 patients with atrial flutter; in 13, a lateral line (LL) of isthmus block was drawn; in the other with draw a septal line (SPT); we used 8 mm non-irrigated tip catheters (60W power (PW); maximal temperature (TEMP) of 70 °C – LL). With SPT, same catheters but 40W; 50°C TEMP). In SPT we interrupted radiofrequency with high rate junctional rhythm (HJR) and looked for another position. We obtained bi-directional isthmus-block in all patients. No differences in terms of total fluoroscopy time, between both groups; total duration of time of the procedure (TDTP) was less in the LL group (50,38±3,23 versus 51,69 ± 2,98 minutes, p< 0.001). PW used was higher in the LL group (0,36±0,29 versus 0,30 + 7-0,09 mV, p< 0.001) as well as TEMP (56,15±3,6 versus 44,85 ± 1,5 °C p< 0.001). Number pulses was higher in SPT (11,77±1,42 versus 12,61±1,56, p< 0.01). The success with LL and SPT was similar; PW and TEMP were reduced in SPT, pulses interrupted with HJR. SPT was safe with less PW; SPT required higher number of pulses TDTP was longer.