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Background:Coronary sinus(CS electrode catheter has been used as a very useful mapping and guiding tool in catheter ablation of the left-side atrioventricular pathway(AP. Recently, it was reported that single catheter approach of catheter ablation of the manifest left-side AP was feasible with a comparable success rate but shorter fluoroscopy time, compared with the standard approach. This study was performed to evaluate the role of CS electrode catheter in catheter ablation of the left- side AP. Subjects and Methods:Sixty-five consecutive patients(43 men, 22 women with a single left- side AP were included in this study. The first 32 patients underwent catheter ablation with an electrode catheter in CS(CS+ group;19 men, 13 women;42.3±14.6 years and the later 33 patients with no electrode catheter in CS(CS- group;24 men, 9 women;38.8±14.1 years. APs were localized by mapping the CS in CS+ group or by mapping the mitral valve annulus in CS- group with a 4 mm-tipped deflectable catheter(7F, Webster or EPT. Radiofrequency energy(RF was delivered unipolarly at a fixed power of 30-50 volts or 30 watts for 30-60 seconds. AP location, success rate, number of RF applications, fluoroscopy time, and complications were compared between 2 groups. Results:APs were located at the left posteroseptal wall in 2(6.2%, left posterior wall in 5(15.5%, left posterolateral wall in 3(9.3%, left lateral wall in 18(56.3%, left anterolateral wall in 4(12.5% in CS+ group. In CS- group, there were 6(18.2% left posteroseptal, 2(6.1% left post-

Role of Coronary Sinus Electrode Catheter in Catheter Ablation of the Left-side Atrioventricular Accessory Pathways