Baseline and maximal preexcitation
Both baseline and full preexcitation based ECG analysis were implemented in WPW24.com to enhance its functionality. However, the baseline preexcitation maps showed wider spread of regions than full preeexcitation maps indicating lower value of fused QRS vectors for AP localization. For formal comparison of baseline and full preexcitation AP distribution maps three differentiating QRS polarities were chosen: lead V1 negative/predominantly negative, lead I positive/predominantly positive, lead III positive/predominantly positive. For each of these polarities APs distribution were compared between baseline and full preexcitation confirming differences in distribution (p < 0.05); for visual assessment see Supplementary Figure 3.