Cardiac Mean Electrical Axis in Thoroughbreds-Standardization by the Dubois Lead Positioning System.

Summary

# Cardiac Mean Electrical Axis in Thoroughbreds—Standardization by the Dubois Lead Positioning System Electrocardiographic interpretation in equine practice remains hindered by inconsistent electrode placement protocols, which directly affect the reliability of cardiac axis measurements—a clinically important parameter for identifying conduction abnormalities and arrhythmias in performance horses. Da Costa Frére and colleagues evaluated the Dubois lead positioning system as a standardised method for ECG acquisition in Thoroughbreds, comparing it against existing methodologies to establish the most reproducible approach for calculating mean electrical axis (MEA). The Dubois system provided superior standardisation of electrode placement and significantly improved the consistency of MEA calculations across repeated recordings, enabling practitioners to generate more comparable baseline values and detect genuine pathological changes rather than artefactual variation from technique differences. For farriers, veterinarians and physiotherapists involved in pre-purchase screening, lameness investigations and fitness assessment, this work supports the adoption of standardised ECG protocols that enhance diagnostic accuracy and allow meaningful longitudinal monitoring of individual horses. Implementing the Dubois positioning approach in practice would reduce inter-operator variability and strengthen the clinical utility of ECG findings in guiding treatment and performance management decisions.

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Key Findings

• •The Dubois lead positioning system provides standardized electrode placement for equine ECG recording
• •Mean electrical axis calculation requires standardized methodology for reliable interpretation in Thoroughbreds
• •Proper electrode positioning methodology improves comparability of electrocardiographic findings across studies and clinical settings

Conditions Studied