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Figure 3 The left panel shows an example of right ventricular outflow tract (RVOT) ventricular tachycardia (VT) in a patient with sustained VT. The second VT complex has been identified as the target waveform by the annotation markers placed on either side of this complex. The middle panel shows a pace-map from free wall site 1 (FW1) next to the superimposed VT and pace-map waveforms after automatic computer alignment. There are substantial differences between these two waveforms (highlighted in gray), resulting in a mean absolute deviation (MAD) score of 31.5%. The right panel shows a pace-map from the successful ablation site (Abl S) near the posterior septum and the superimposed pace-map and VT waveform. Note in the Abl S panel that when these two waveforms are aligned they are nearly superimposable, and result in a very low MAD score of 5.3%. Correlation coefficients for these comparisons are also shown.
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