title: Spectrotemporal analysis of ventricular late potentials.
abstract: The authors introduce a new technique for the analysis of ventricular late potentials: spectrotemporal mapping. Spectrotemporal mapping displays a signal in both the time and frequency domains simultaneously, overcoming some of the limitations of single domain analysis. Spectrotemporal analysis of late potentials was developed from a critique of classical spectral analysis methods. Several examples of spectrotemporal analysis of signal-averaged ECG waveforms are presented. These include cases in which spectrotemporal mapping was able to represent late potentials that were not seen after conventional time-domain processing. Spectrotemporal mapping reveals that ventricular late potentials have a time-varying energy spectrum, which theoretically would preclude the use of classical Fourier analysis techniques. Both the vector magnitude and Fourier transformations are a reduced representation of the information available in the signal average. Spectrotemporal mapping combines time and frequency information in a way that is compatible with the basic statistical structure of late potentials.
authors.affiliation: Department of Medicine, University of Oklahoma Health Sciences Center, Oklahoma City.
authors.forename: P
authors.initials: P
authors.lastname: Lander
authors.forename: D E
authors.initials: DE
authors.lastname: Albert
authors.forename: E J
authors.initials: EJ
authors.lastname: Berbari
mesh_terms: D004562:Electrocardiography / Q000379:methods*; D005583:Fourier Analysis; D006329:Heart Conduction System / Q000502:physiology*; D006801:Humans; D012815:Signal Processing, Computer-Assisted