Einthoven's triangle adapted for horses: Proposal for the Delta configuration.
Authors: Paulussen Ellen, Van Steenkiste Glenn, Hermans Ben J M, Decloedt Annelies, van Loon Gunther, Delhaas Tammo
Journal: Journal of veterinary internal medicine
Summary
# Editorial Summary: Standardising equine ECG electrode placement Inconsistent electrocardiogram (ECG) recording techniques have long hampered arrhythmia diagnosis and treatment protocols across equine practice, prompting researchers to identify an optimal, standardised electrode configuration for horses comparable to the established Einthoven's triangle in human cardiology. Using 72 healthy warmblood horses aged 3–20 years, Paulussen and colleagues positioned 11 electrodes around the thorax behind the olecranon to construct multiple triangular configurations, then analysed the resulting ECG recordings using principal component analysis and Euclidean distance measures to determine which arrangement captured the most diagnostic information. A base-down triangle configuration—termed the "Delta (Δ) configuration"—emerged as superior, with electrodes positioned in the transverse plane around the left mid-thoracic and ventral regions, generating larger amplitudes and enhanced signal quality whilst maintaining orthogonal geometry suitable for future 12-lead ECG systems. This standardised approach offers farriers, veterinary surgeons and physiotherapists a reproducible framework for consistent ECG acquisition, potentially improving diagnostic accuracy for arrhythmias and enabling better cross-referencing of results between different practices and research studies. Adoption of the Delta configuration could significantly advance equine cardiac evaluation and facilitate direct comparison of ECG data in clinical and research settings.
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Practical Takeaways
- •Adoption of the Delta configuration electrode positioning could standardize ECG recordings across equine practices, improving consistency and comparability of arrhythmia diagnoses
- •The new configuration may enhance early detection and characterization of cardiac arrhythmias by providing larger signal amplitudes and better spatial information about electrical activity
- •Implementing this standardized electrode placement in your practice prepares for future multicentre studies and advanced diagnostic techniques like vectorcardiography
Key Findings
- •A base-down triangle configuration (Delta configuration) positioned in the transverse plane behind the olecranon emerged as the optimal adaptation of Einthoven's triangle for equine ECG recordings
- •The Delta configuration provided large amplitudes and high summed Euclidean distances, enhancing diagnostic capability for cardiac arrhythmias
- •Positioning electrodes in the left mid-thoracic and ventral regions yielded high principal component analysis scores, indicating optimal information content
- •The Delta configuration's transverse plane positioning forms an ideal basis for standardized 12-lead ECG recordings with orthogonal vectorcardiographic capability