Computerized ECG recording in horses during a standardized exercise test.

This study aimed to develop a satisfactory method for recording electrocardiograms (ECGs) of horses during exercise, using computerized technology. The researchers developed a process that proved reliable in both healthy horses and those with health issues, which could be beneficial for diagnosing arrhythmias.

Objective of the research

• This research aimed to design a reliable method of capturing a horse’s ECG recording during physical activity because cardiac arrhythmias are potential reasons behind underperformance in horses.
• The researchers also wanted to ascertain whether this method could be implemented not only in healthy horses but also those with health conditions.

Methodology

• Researchers used ten healthy research horses to develop the method initially meant for human ECG recording, adapting it with the Cardio Perfect software program.
• During a standardized treadmill exercise test, the ECG of each horse was recorded at varying walk, trot, and canter speeds. Bipolar leads collected data from specific points on the horse’s body, and a unipolar lead collected data from the left ventral thorax.
• The exercise test also measured each horse’s plasma lactate concentration, which indicates the level of anaerobic threshold.
• Finally, the process was repeated with three diseased horses to evaluate its application on specimens with varying health conditions.

Findings

• The quality of ECG recordings during the exercise test was satisfactory. Heart rates were detectable, and any arrhythmias were identifiable.
• Reference values for heart rates at different stages of the exercise test varied from 84 + or – 7 to 176 + or – 21 beats per minute (bpm).
• Most healthy horses did not present any arrhythmias during exercise, except for a single incident of an atrial premature complex (APC).
• The test provoked a plasma lactate concentration in healthy horses around the anaerobic threshold. This supports the conclusion that the exercise test can successfully measure physical exertion in horses.
• Most of the diseased horses were able to complete the test, indicating that the method is applicable across different health conditions.

Conclusion

• The researchers concluded that the developed method for ECG recording during a standardized exercise test in horses is reliable and applicable both in healthy horses and those with health conditions.
• This method can efficiently diagnose arrhythmias in horses, thereby extending the possibilities of veterinary care and treatment for these animals.