Figure 3  .

A patient with right posterior septal accessory pathway. (A) and (B): ECG recording before and after ablation. On the basis of the Oklahoma ECG algorithm, all three cardiologists assessed the location to be left posterior septum; on the basis of the St George's algorithm, one of the three assessed the location to be left posterior septum. (C) Right anterior view, and (D) left anterior view: catheter position (arrowheads) for radiofrequency ablation. Catheter was positioned at the right posterior septum. (E) and (F): M mode echocardiography tracings before and after ablation. Notch movement of the left ventricular posterior systolic motion cannot be seen in (D) and amplitude of left ventricular systolic motion was within the normal range. Pre-excitation wall motion—that is, early systolic movement (indicated by an arrowhead) and notch in the systolic septal motion (indicated by an arrow)—were observed in (E). Reduced posterior systolic wall motion cannot be seen. (F) After ablation, left ventricular systolic motion was unchanged.