Validation and clinical application of implantable loop recorders for diagnosis of atrial fibrillation in horses.
Authors: Kjeldsen Sofie Troest, Nissen Sarah D, Christensen Nina C, Haugaard Simon L, Schneider Mélodie J, Vinther Zenta, Sattler Stefan M, Carstensen Helena, Jøns Christian, Hopster-Iversen Charlotte, Buhl Rikke
Journal: Equine veterinary journal
Summary
# Editorial Summary Paroxysmal atrial fibrillation represents a diagnostic challenge in equine medicine because arrhythmias often resolve before standard surface electrocardiography can capture them, potentially masking performance-limiting cardiac conditions. This study evaluated whether implantable loop recorders (ILRs)—small cardiac monitoring devices routinely implanted in human patients—could reliably detect atrial fibrillation episodes in horses and improve diagnostic accuracy beyond conventional methods. The research team validated ILR technology through implantation and monitoring protocols specific to equine patients, establishing the device's sensitivity and specificity for AF detection. The findings demonstrate that ILRs successfully identified paroxysmal AF episodes that would have been missed by standard ECG, offering clinicians an objective, continuous monitoring tool for horses with suspected arrhythmias affecting performance. For practitioners managing athletic horses with recurrent performance issues, unexplained fatigue, or clinical signs suggestive of cardiac dysfunction, ILR implantation now provides a means of establishing definitive diagnosis during normal training and competition, enabling more targeted therapeutic decisions and accurate prognosis.
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Practical Takeaways
- •For horses with suspected paroxysmal atrial fibrillation affecting performance but negative surface ECG findings, implantable loop recorders provide a diagnostic solution to detect intermittent arrhythmias
- •ILR technology allows definitive diagnosis without requiring the arrhythmia to be present during examination, improving case resolution in athletic horses with unexplained performance issues
- •Consider ILR placement when paroxysmal AF is suspected but conventional ECG cannot capture the arrhythmia during clinical evaluation
Key Findings
- •Implantable loop recorders enable detection of paroxysmal atrial fibrillation that cannot be captured by surface electrocardiography
- •ILR placement in horses is feasible and provides continuous monitoring for sporadic arrhythmia detection
- •ILR technology offers superior diagnostic capability for AF diagnosis compared to gold standard surface ECG in cases of intermittent arrhythmia