Key result
Arrhythmias complicate ~34% of equine workouts, linked to prior cardiac signs and peak heart rate.
Why the study?
Exercising arrhythmias can range from clinically irrelevant to causing poor performance, collapse, and sudden cardiac death, but whether readable exercising ECGs can be obtained by grooms or riders and how arrhythmias relate to workout type, previous cardiac signs, and exercise intensity needed evaluation.
Is it feasible for riders or grooms to record readable exercising ECGs in Eventing horses, and what are the associated arrhythmias?
Cohort (n=62)
Is it feasible for riders or grooms to record readable exercising ECGs in Eventing horses, and what are the associated arrhythmias?
Monitoring the rhythm of equine athletes with ECGs obtained by riders is feasible and shows that arrhythmias are frequent during exercise.
May warrant exercise ECG screening in eventing horses with prior signs; leaves open prognostic implications for performance and safety.
BACKGROUND: Exercising arrhythmias can be clinically irrelevant or associated with poor performance, collapse and sudden cardiac death. OBJECTIVES: To test if readable exercising ECGs can be recorded by grooms or riders and to describe arrhythmias in ECGs from different types of exercise in Eventing horses and investigate associations with type of workout, the presence of previous cardiac signs and intensity of exercise. STUDY DESIGN: Cohort study. METHODS: Single lead exercising ECGs were obtained by riders or grooms during training and competition from a convenience sample of horses in training for Eventing competitions. Arrhythmias were described, and associations between different arrhythmia categories and variables that described the horse and the workouts were sought. RESULTS: There were 1002 ECGs from 62 horses (median [range] 7 [2-97] ECGs/horse) evaluated and 737 workouts (73.6%) were >95% readable and included in the analysis. There were arrhythmias in 250 (33.9%) of the workouts, complex arrhythmias in 13 (1.8%) and the number of premature complexes was median (range) 0 (0-118). Peak heart rate and duration of exercise were associated with the number of premature complexes, the presence of arrhythmias and complex arrhythmias and were colinear with the type of exercise. Having previous signs of cardiac disease and the type of workout were associated with higher odds of having arrhythmias. CONCLUSIONS: Monitoring the rhythm of equine athletes with ECGs obtained by riders and transmitted to an online cloud was feasible. Arrhythmias were frequent, and complex arrhythmias were rare. The presence of cardiac signs, type of exercise and peak heart rate were associated with the presence of arrhythmias. None of the horses developed poor performance or collapse attributed to cardiac disease. The arrhythmias that should be concerning for equine veterinarians need further definition.
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Solís et al. (2024) conducted a cohort in Eventing horses with and without cardiac signs (n=62). Exercise intensity and previous cardiac signs vs. Lower exercise intensity or no previous cardiac signs was evaluated on Presence of arrhythmias during exercise. Exercising arrhythmias were detected in 33.9% of workouts among 62 Eventing horses, with higher odds associated with previous cardiac signs, type of exercise, and peak heart rate.
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