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Electrocardiogram

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Updated: Jun 28, 2026

Cardiac Magnetic Resonance Imaging at 7 Tesla

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Published on: January 6, 2019

High-resolution electrocardiography.

C A Calvert¹

¹Department of Small Animal Medicine and Surgery, College of Veterinary Medicine, University of Georgia, Athens, USA.

The Veterinary Clinics of North America. Small Animal Practice

|March 31, 1999

Summary

Signal-averaged electrocardiography (SAECG) detects ventricular late potentials (LP) in dogs with cardiomyopathy, potentially predicting fatal arrhythmias. This method shows promise for identifying dogs at risk of sudden cardiac death.

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Area of Science:

Cardiology
Veterinary Medicine
Biomedical Engineering

Background:

High-resolution electrocardiography, or signal-averaged electrocardiography (SAECG), is used in human medicine to identify ventricular late potentials (LP).
LP are markers for myocardial reentrant pathways and predict future arrhythmic events like ventricular tachycardia (VT).
SAECG analysis, in both time and frequency domains, has limitations but offers valuable diagnostic information.

Purpose of the Study:

To investigate the presence and significance of ventricular late potentials (LP) in dogs with cardiomyopathy using signal-averaged electrocardiography (SAECG).
To assess the potential of SAECG in predicting ventricular tachycardia (VT) and sudden arrhythmic death in cardiomyopathic dogs.

Main Methods:

Application of signal-averaged electrocardiography (SAECG) to dogs diagnosed with cardiomyopathy and experiencing ventricular tachycardia (VT).
Analysis of SAECG data to detect the presence or absence of ventricular late potentials (LP).
Correlation of SAECG findings with clinical outcomes, including VT inducibility and sudden death.

Main Results:

Some cardiomyopathic dogs with VT exhibited SAECG findings suggestive of LP.
Sudden arrhythmic death was observed in a subset of these dogs.

Conclusions:

Signal-averaged electrocardiography (SAECG) may identify ventricular late potentials (LP) in dogs with cardiomyopathy.
The presence of LP in these dogs is associated with a risk of ventricular tachycardia (VT) and sudden cardiac death.
SAECG shows potential as a non-invasive tool for risk stratification in canine cardiomyopathy.