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Figure 4 (A) The mean absolute deviation (MAD) scores for the 14 patients with septal ventricular tachycardia (VT) origin comparing the clinical VT to pacing from posterior septal site 1 (S1), mid septal site 2 (S2), anterior septal site 3 (S3), free wall site 1 (F1), free wall site 2 (F2), free wall site 3 (F3), the right ventricular apex (RVA), unsuccessful ablation sites (Abl F), successful ablation sites (Abl S), and comparing the chosen VT beat to other similar morphology VT beats (VT). Note that the average MAD scores are significantly lower for septal compared with free wall sites. The average MAD score was also significantly lower for successful compared with unsuccessful ablation sites, and all successful ablation sites had a MAD score <15%. *p = 0.01. (B) The mean ± SD correlation coefficient ( ) scores for the same comparison as in the previous graph. The overall pattern is similar to the previous graph, although there is less spread among the sites. The average correlation for successful ablation sites was not significantly lower than that of unsuccessful ablation sites.
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