Spatial Resolution of Activation and Pace Mapping Determined by Noncontact Map: Which Is Better?

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Aim: Some publications reported pace mapping with better spatial resolution than activation mapping. In this study, we would compare the spatial resolution between activation and pace mapping by non-contact mapping. Methods: Consecutive 120 patients with spontaneous RVOT-VT/PVCs were recruited for this study. The non-contact mapping was used to identify earliest activation (EA) and breakout (BO) sites. The non-contact mapping, activation mapping and pace mapping were used to calculate the area of myocardium activated within the first 10 ms by activation mapping was defined as the early activation area (EAA) and the area of myocardium captured within the first 10 ms by pace mapping was defined as the early capture area (ECA). Results: There were 86 women and 34 men. Their mean age was 45.76±10.13 years old. The acute successful rate was 95.00% (114/120). The mean of ECA at the EA and BO sites (15.45±7.77 cm2, 18.71±8.42 cm2, respectively) were significant bigger than the mean of EAA at the EA and BO sites (7.04±4.76 cm2, 15.12±7.10 cm2, P<0.01, respectively). There was no significant difference of pace score between the EA and BO sites (P>0.05, respectively). Conclusion: Activation mapping provide better spatial resolution than pace mapping for identifying the origin of RVOT tachycardia or PVC.