06/06/2026
🔎 What if we’ve been looking for cardiac arrhythmias in racehorses at the wrong time all along?
In a recent study published in the Journal of Veterinary Internal Medicine (JVIM), Dr. Fe Ter Woort, Dr. Stephen O’Connor, and Dr. Emmanuelle van Erck identified brief episodes of arrhythmia resembling paroxysmal atrial fibrillation (pAF) in Thoroughbred racehorses during peak exercise.
📈 Using wearable ECG technology during full-speed gallop training sessions, the team detected short bursts of abnormal rhythm lasting 10–90 seconds.
⚠️ Even more striking, these episodes resolved spontaneously before the end of exercise, meaning they would be completely missed by the post-exercise ECGs traditionally used to screen for cardiac abnormalities.
💡 While the clinical significance of these findings remains to be fully understood, the study highlights a major diagnostic blind spot and underscores the potential value of real-time cardiac monitoring during maximal exertion.
Given that fatal cardiac arrhythmias are estimated to account for around 50% of exercise-associated sudden deaths in Thoroughbred racehorses, these findings could have important implications for both equine welfare and athlete safety.
Sometimes, the most important discoveries are not what we find after an event—but what we can detect before it happens 🐎💙
The full article is on 👉🏻 https://academic.oup.com/jvim/article/40/3/aalag095/8690680?utm_source=chatgpt.com