Implantable loop recorders can detect paroxysmal atrial fibrillation in Standardbred racehorses with intermittent poor performance.
Authors: Buhl Rikke, Nissen Sarah D, Winther Marie L K, Poulsen Sofie K, Hopster-Iversen Charlotte, Jespersen Thomas, Sanders Prashanthan, Carstensen Helena, Hesselkilde Eva M
Journal: Equine veterinary journal
Summary
# Editorial Summary Paroxysmal atrial fibrillation (PAF) represents a diagnostic challenge in racehorses because its intermittent nature makes detection difficult with conventional electrocardiography, yet the condition can substantially impair performance if left unidentified. Buhl and colleagues deployed implantable loop recorders (ILRs)—small subcutaneous devices that provide continuous automated cardiac monitoring—in Standardbred racehorses presenting with unexplained, intermittent poor performance to determine whether PAF could be reliably detected in this population. The ILR technology successfully identified paroxysmal episodes in affected horses, enabling confirmation of PAF as an underlying cause of performance issues that might otherwise remain undiagnosed. For equine practitioners working with performance horses, this work demonstrates that ILRs offer a practical diagnostic pathway when conventional ECG fails to capture arrhythmic events, allowing targeted management decisions rather than persistent performance problems of unknown aetiology. The findings have particular relevance for farriers, veterinarians and coaches collaborating on racehorses with cryptic lameness or gait abnormalities, as cardiac dysfunction may be an overlooked contributor requiring specialist referral for definitive diagnosis.
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Practical Takeaways
- •Consider paroxysmal atrial fibrillation as a differential diagnosis in racehorses presenting with intermittent poor performance that cannot be explained by other causes
- •Implantable loop recorders offer a practical diagnostic tool for detecting PAF in horses when traditional ECG monitoring fails to capture episodic arrhythmias
- •Early detection of PAF may enable targeted management strategies to improve or maintain performance in affected racehorses
Key Findings
- •Implantable loop recorders can successfully detect paroxysmal atrial fibrillation in Standardbred racehorses with intermittent poor performance
- •Paroxysmal atrial fibrillation is difficult to diagnose due to its intermittent occurrence but may be an undiagnosed cause of performance issues
- •Continuous automatic ECG monitoring via subcutaneous ILR devices provides reliable detection of PAF episodes in equine patients