A novel approach for obtaining 12-lead electrocardiograms in horses.
Authors: Hesselkilde Eva M, Isaksen Jonas L, Petersen Bettina V, Carstensen Helena, Jespersen Thomas, Pehrson Steen, Kanters Jørgen K, Buhl Rikke
Journal: Journal of veterinary internal medicine
Summary
# Editorial Summary: A Novel Approach for Obtaining 12-Lead Electrocardiograms in Horses Although 12-lead electrocardiography offers valuable diagnostic information in equine cardiology, its clinical uptake remains limited—partly because conventional electrode placement guidelines position limb leads perpendicular to the horse's ventricular electrical axis, producing highly variable recordings even in healthy animals. Hesselkilde and colleagues proposed an electrophysiologically optimised electrode placement system that aligns limb leads parallel to the ventricular mean electrical axis, thereby reducing inter-individual variation and improving standardisation. By repositioning electrodes on the thorax rather than the extremities and accounting for the horse's cardiac electrical geometry, the researchers demonstrated substantially more consistent ECG configurations across normal horses, enabling clearer identification of genuine pathological abnormalities rather than normal anatomical variation. This methodological refinement has direct implications for practitioners: standardised 12-lead ECGs become more reliable for detecting arrhythmias, conduction disturbances, and other cardiac conditions, particularly when comparing serial recordings or assessing individual cases against established reference ranges. Wider adoption of this protocol could significantly enhance the diagnostic utility of equine electrocardiography in veterinary practice and potentially expand its use in pre-purchase examinations and fitness assessments.
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Practical Takeaways
- •Current standard ECG protocols may produce misleading results due to inappropriate lead placement; consider alternative lead positioning strategies based on electrophysiological principles
- •High variability in ECG configurations from traditional guidelines means abnormalities in individual horses may be difficult to interpret without breed or individual baseline comparisons
- •Adoption of improved lead placement techniques could standardize equine ECGs and make them more clinically useful for detecting genuine cardiac pathology
Key Findings
- •Current guidelines for 12-lead ECG placement in horses position limb leads perpendicular to the ventricular mean electrical axis, causing large variations in ECG configuration among healthy horses
- •Electrophysiological theory supports placing leads parallel to the electrical axis to minimize variability and improve diagnostic standardization
- •Existing 12-lead ECG guidelines for equines are a significant barrier to wider clinical adoption in equine medicine