Failure of spectro-temporal mapping to detect ventricular late potentials in dogs
Calvert, C.A.; Jacobs, G.J.; Kraus, M.S.
American Journal of Veterinary Research 60(4): 396-401
1999
ISSN/ISBN: 0002-9645 PMID: 10211678 Document Number: 503596
11 dogs (9 of which subsequently died suddenly) with ventricular arrhythmias and abnormal time-domain analysis (TDA) of the signal-averaged ECG were used to evaluate the efficacy of frequency domain analysis (FDA) in diagnosing ventricular late potentials (LP). Signal-averaged ECG that were abnormal when analysed 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. Three-dimensional FDA did not detect ventricular LP. It is concluded that LP may be detected by TDA of the signal-averaged ECG and may be a specific marker for ventricular tachycardia and sudden death in some dogs, but FDA used in this study is invalid.