Initial Experience of Catheter Ablation of Atrial Tachycardia Using CARTO System

To explore the role of CARTO system for electroanatomical mapping and ablation of atrial tachycardia(AT),five consecutive patients (age 42.4±15.8 years) with AT were included in this study. The cycle length was 355±76 ms. No cases had structured heart disease except one with congenital trilogy of Fallot after surgical operation. During tachycardia, three dimensional electroanatomical map of the atrium of interest was created using CARTO system, and under its guidance radiofrequency(RF) pulses were delivered.AT was successfully ablated in all five cases with 3.5±2.1 RF pulses.Three cases were intra atrial reentrant tachycardia in right atrium. Among of them, one with scar related AT.Two cases were focal AT(para hisial foci in right atrium and left posterior wall in left atrium respectively).The fluoroscopic time was 14±9 minutes. The procedure time was 239±45 minutes.Conclusion: This study suggests the feasibility of CARTO system mapping and ablation of reentrant and focal AT. Under less fluoroscopic exposure, the optimal target site is easily marked and ablated successfully, especially in the abnormal cardiac anatomy and complex AT.