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Occurrence of cardiac arrhythmias in Standardbred racehorses.
Equine Vet J. 2015 Jul; 47(4):398-404.EV

Abstract

REASONS FOR PERFORMING STUDY

Cardiac arrhythmias are a recognised but poorly characterised problem in the Standardbred racehorse. Frequency data could aid the development of cardiac arrhythmia screening programmes.

OBJECTIVES

To characterise the occurrence of cardiac arrhythmias in Standardbreds prior to racing and in the late post race period using a handheld, noncontinuous recording device.

STUDY DESIGN

Prospective, observational study, convenience sampling.

METHODS

Noncontinuous electrocardiographic recordings were obtained over a 12 week period from Standardbred horses competing at a single racetrack. Electrocardiograms were obtained before racing and between 6 and 29 min after the race using a handheld recording device. Prevalence of arrhythmias was calculated for all horses and overall frequency of arrhythmias was calculated for race starts and poor performers. Univariate logistic regression analysis was used to identify risk factors for cardiac arrhythmias.

RESULTS

A total of 8657 electrocardiogram recordings were obtained from 1816 horses. Six horses had atrial fibrillation after racing (prevalence = 0.11%, frequency = 0.14%), one horse had supraventricular tachycardia before racing (prevalence = 0.06%, frequency = 0.02%), and 2 horses had ventricular tachyarrhythmias after racing (prevalence = 0.06%, frequency = 0.05%). The frequency of atrial fibrillation among race starts with poor performance was 1.3-2.0%. Increasing age was a significant risk factor for the presence of atrial premature contractions before racing and atrial fibrillation and ventricular ectopy after racing.

CONCLUSIONS

Both physiological and pathological cardiac arrhythmias can be detected in apparently healthy Standardbred horses in the prerace and late post race period using noncontinuous recording methods. Future studies should examine cumulative training or racing hours as a risk factor for cardiac arrhythmia. The prevalence and frequency information may be useful for track veterinarians and regulatory personnel following trends in cardiac arrhythmias.

Authors+Show Affiliations

Department of Clinical Studies, New Bolton Center, University of Pennsylvania, USA.Department of Clinical Studies, New Bolton Center, University of Pennsylvania, USA.Department of Clinical Studies, New Bolton Center, University of Pennsylvania, USA.Department of Clinical Studies, New Bolton Center, University of Pennsylvania, USA.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

24819401

Citation

Slack, J, et al. "Occurrence of Cardiac Arrhythmias in Standardbred Racehorses." Equine Veterinary Journal, vol. 47, no. 4, 2015, pp. 398-404.
Slack J, Boston RC, Soma LR, et al. Occurrence of cardiac arrhythmias in Standardbred racehorses. Equine Vet J. 2015;47(4):398-404.
Slack, J., Boston, R. C., Soma, L. R., & Reef, V. B. (2015). Occurrence of cardiac arrhythmias in Standardbred racehorses. Equine Veterinary Journal, 47(4), 398-404. https://doi.org/10.1111/evj.12299
Slack J, et al. Occurrence of Cardiac Arrhythmias in Standardbred Racehorses. Equine Vet J. 2015;47(4):398-404. PubMed PMID: 24819401.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Occurrence of cardiac arrhythmias in Standardbred racehorses. AU - Slack,J, AU - Boston,R C, AU - Soma,L R, AU - Reef,V B, Y1 - 2014/07/17/ PY - 2012/10/26/received PY - 2014/05/01/accepted PY - 2014/5/14/entrez PY - 2014/5/14/pubmed PY - 2016/3/18/medline KW - Standardbred KW - atrial fibrillation KW - horse KW - poor performance KW - ventricular arrhythmias SP - 398 EP - 404 JF - Equine veterinary journal JO - Equine Vet J VL - 47 IS - 4 N2 - REASONS FOR PERFORMING STUDY: Cardiac arrhythmias are a recognised but poorly characterised problem in the Standardbred racehorse. Frequency data could aid the development of cardiac arrhythmia screening programmes. OBJECTIVES: To characterise the occurrence of cardiac arrhythmias in Standardbreds prior to racing and in the late post race period using a handheld, noncontinuous recording device. STUDY DESIGN: Prospective, observational study, convenience sampling. METHODS: Noncontinuous electrocardiographic recordings were obtained over a 12 week period from Standardbred horses competing at a single racetrack. Electrocardiograms were obtained before racing and between 6 and 29 min after the race using a handheld recording device. Prevalence of arrhythmias was calculated for all horses and overall frequency of arrhythmias was calculated for race starts and poor performers. Univariate logistic regression analysis was used to identify risk factors for cardiac arrhythmias. RESULTS: A total of 8657 electrocardiogram recordings were obtained from 1816 horses. Six horses had atrial fibrillation after racing (prevalence = 0.11%, frequency = 0.14%), one horse had supraventricular tachycardia before racing (prevalence = 0.06%, frequency = 0.02%), and 2 horses had ventricular tachyarrhythmias after racing (prevalence = 0.06%, frequency = 0.05%). The frequency of atrial fibrillation among race starts with poor performance was 1.3-2.0%. Increasing age was a significant risk factor for the presence of atrial premature contractions before racing and atrial fibrillation and ventricular ectopy after racing. CONCLUSIONS: Both physiological and pathological cardiac arrhythmias can be detected in apparently healthy Standardbred horses in the prerace and late post race period using noncontinuous recording methods. Future studies should examine cumulative training or racing hours as a risk factor for cardiac arrhythmia. The prevalence and frequency information may be useful for track veterinarians and regulatory personnel following trends in cardiac arrhythmias. SN - 2042-3306 UR - https://www.unboundmedicine.com/medline/citation/24819401/Occurrence_of_cardiac_arrhythmias_in_Standardbred_racehorses_ L2 - https://doi.org/10.1111/evj.12299 DB - PRIME DP - Unbound Medicine ER -