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Figure 1 Tomography before (A, B) and after RF ablation (C, D) of a left sided bypass tract. Panels A, C and B, D represent the left and the right ventricle, respectively. There is a phase difference between left (A) and right ventricle (B) that disappeared after ablation. However, we note that the preexcitation zone is anterolateroapical before RF and produces clear preexcitation in the left ventricle, whereas after RF, there is a persistence of a small abnormal early ventricular conduction zone in the apicolateral part (arrow).
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