title: Failure of spectro-temporal mapping to detect ventricular late potentials in dogs.
abstract: OBJECTIVE
  To determine whether ventricular late potentials (LP) identified by time-domain analysis (TDA) of the signal-averaged ECG could be identified by three-dimensional frequency-domain analysis (FDA).
  
  
  METHODS
  11 dogs (9 of which subsequently died suddenly) with ventricular tachyarrhythmias (10 with ventricular tachycardia) and abnormal TDA of the signal-averaged ECG.
  
  
  METHODS
  Signal-averaged ECG that were abnormal when analyzed in the time domain subsequently were processed further in the frequency domain. Correlation ratios were calculated, and spectro-temporal maps were plotted, which were then compared with control data.
  
  
  RESULTS
  Three-dimensional FDA did not detect LP.
  
  
  CONCLUSIONS
  LP may be detectable by TDA of the signal-averaged ECG and may be a specific marker for VT and sudden death in some dogs. However, FDA by use of the method applied in this study is invalid.
authors.affiliation: Department of Small Animal Medicine, College of Veterinary Medicine, University of Georgia, Athens 30602, USA.
authors.forename: C A
authors.initials: CA
authors.lastname: Calvert
authors.forename: G J
authors.initials: GJ
authors.lastname: Jacobs
authors.forename: M S
authors.initials: MS
authors.lastname: Kraus
mesh_terms: D000818:Animals; D003645:Death, Sudden / Q000662:veterinary; D004283:Dog Diseases / Q000503:physiopathology*; D004285:Dogs; D004562:Electrocardiography / Q000379:methods / Q000662:veterinary*; D006352:Heart Ventricles / Q000503:physiopathology; D017180:Tachycardia, Ventricular / Q000503:physiopathology / Q000662:veterinary; D016276:Ventricular Function