title: A wavelet-based electrogram onset delineator for automatic ventricular activation mapping.
abstract: Electroanatomical mapping (EAM) systems are commonly used in clinical practice for guiding catheter ablation treatments of common arrhythmias. In focal tachycardias, the ablation target is defined by locating the earliest activation area determined by the joint analysis of electrogram (EGM) signals at different sites. However, this is currently a manual time-consuming and experience-dependent task performed during the intervention and thus prone to stress-related errors. In this paper, we present an automatic delineation strategy that combines electrocardiogram (ECG) information with the wavelet decomposition of the EGM signal envelope to identify the onset of each EGM signal for activation mapping. Fourteen electroanatomical maps corresponding to ten patients suffering from non-tolerated premature ventricular contraction (PVC) beats and admitted for ablation procedure were used for evaluation. We compared the results obtained automatically with two types of manual annotations: one during the intervention by an expert technician (on-procedure) and other after the intervention (off-procedure), free from time and procedural constraints, by two other technicians. The automatic annotations show a significant correlation (0.95, p 0.01) with the evaluation reference (off-procedure annotation sets combination) and has an error of 2.1 ± 10.9 ms, around the order of magnitude of the on-procedure annotations error ( - 2.6 ± 6.8 ms). The results suggest that the proposed methodology could be incorporated into EAM systems to considerably reduce processing time during ablation interventions.
authors.forename: Alejandro
authors.initials: A
authors.lastname: Alcaine
authors.forename: David
authors.initials: D
authors.lastname: Soto-Iglesias
authors.forename: Mireia
authors.initials: M
authors.lastname: Calvo
authors.forename: Esther
authors.initials: E
authors.lastname: Guiu
authors.forename: David
authors.initials: D
authors.lastname: Andreu
authors.forename: Juan
authors.initials: J
authors.lastname: Fernandez-Armenta
authors.forename: Antonio
authors.initials: A
authors.lastname: Berruezo
authors.forename: Pablo
authors.initials: P
authors.lastname: Laguna
authors.forename: Oscar
authors.initials: O
authors.lastname: Camara
authors.forename: Juan Pablo
authors.initials: JP
authors.lastname: Martinez
mesh_terms: D000465:Algorithms; D003936:Diagnosis, Computer-Assisted / Q000379:methods*; D056149:Epicardial Mapping / Q000379:methods*; D006801:Humans; D015588:Observer Variation; D010363:Pattern Recognition, Automated / Q000379:methods*; D011300:Preoperative Care / Q000379:methods; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D018879:Ventricular Premature Complexes / Q000175:diagnosis* / Q000601:surgery; D058067:Wavelet Analysis