Figure 4: Example patient where ECG-morphology based criteria differed from each other. Novel 24-hour Holter parameters correctly predicted SOO. Above - Transition of the sinus beat (at V4) was earlier than ectopic transition (between V3 and V4): using TZI, an LVOT SOO would be expected. V2S/V3R Index gave a ratio of 5.2, predicting RVOT SOO. Middle - Analysis of her 24-hour Holter monitor revealed a CoV of 0.90 and the < 50 VE in any hour parameter was fulfilled (highlighted hour with zero VE), predicting RVOT SOO. Below – site of earliest activation mapped to postero-septal RVOT with favourable characteristics on unipolar electrogram.
Table 1. Baseline characteristics of the derivation cohort.