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Figure 5 Right (30°) and left (45°) anterior oblique (RAO and LAO, respectively) radiographic views of the mapping catheter (Map) at the successful ablation site in the left coronary sinus cusp. The mapping catheter was located below the ostium of the left main coronary artery (LMCA). CS = decapolar catheter inside the coronary sinus, with the distal electrode inside the great cardiac vein; His = decapolar catheter at the His bundle region; JC = 5F left Judkin’s catheter.