Failure of spectro-temporal mapping to detect ventricular late potentials in dogs

Clay A. Calvert From Department of Small Animal Medicine, College of Veterinary Medicine, University of Georgia, Athens, GA 30602.

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Gilbert J. Jacobs From Department of Small Animal Medicine, College of Veterinary Medicine, University of Georgia, Athens, GA 30602.

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Marc S. Kraus From Department of Small Animal Medicine, College of Veterinary Medicine, University of Georgia, Athens, GA 30602.

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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).

Animals

11 dogs (9 of which subsequently died suddenly) with ventricular tachyarrhythmias (10 with ventricular tachycardia) and abnormal TDA of the signal-averaged ECG.

Procedure

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 and Clinical Relevance

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. (Am J Vet Res 1999;60: 396-401)

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).

Animals

11 dogs (9 of which subsequently died suddenly) with ventricular tachyarrhythmias (10 with ventricular tachycardia) and abnormal TDA of the signal-averaged ECG.

Procedure

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 and Clinical Relevance

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. (Am J Vet Res 1999;60: 396-401)

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