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Prevalence of cardiac arrhythmias and R-R interval variation in healthy Thoroughbred horses during official Chuckwagon races and recovery.
Vet J. 2021 Jan; 267:105583.VJ

Abstract

The prevalence and severity of cardiac arrhythmias in healthy racehorses undergoing competition is not well defined. The aim was to characterize arrhythmias in Thoroughbreds participating in official Chuckwagon races and to determine normal beat-to-beat (R-R) variability during supramaximal exercise. Electrocardiograph (ECG) recordings were obtained during pre-race, race, and active-recovery from 82 clinically healthy Thoroughbreds. ECG recordings were analyzed for arrhythmias and mean percent R-R deviation. Plasma lactate and high-sensitivity troponin (hs-cTnT) were also measured. Fifty-two ECGs were included in the analysis. Arrhythmias were seen in 48/52 horses (92%) and were predominantly isolated events. No complex rhythms were observed. During the race, 92% of horses had arrhythmias (81% supraventricular premature complex [SVPC]; 33% ventricular premature complex [VPC]). Eleven percent of racing arrhythmias were VPCs (all singlets except for two couplets). During active-recovery, 58% of horses had arrhythmias (56% SVPC; 15% VPCs): Three horses had VPC couplets and one horse had a VPC triplet. All plasma hs-cTnT were within normal limits. The measured lactate was 28.5 ± 4.5 mmol/L, confirming supramaximal exercise. R-R variation ranged between -9.5 to +18.8% during pre-race (mean heart rate [HR], 155 ± 22 beats per min [bpm]), -27.8 to +45.3% during racing (mean HR, 200 ± 9 bpm) and -16.4 to +40.1% during active-recovery (mean HR, 165 ± 14 bpm). Maximal and 1st percentile R-R shortening and lengthening were significantly greater at race than pre-race and active-recovery (P < 0.0001). Racing and active-recovery maximal R-R lengthening were significantly greater than pre-race (P = 0.0003). Supraventricular premature complexes and VPCs are prevalent in healthy horses undergoing Chuckwagon racing. R-R variation is greater during racing than has previously been described.

Authors+Show Affiliations

Faculty of Veterinary Medicine, University of Calgary, 3330 Hospital Drive NW, Calgary, Alberta, T2N 4Z6, Canada.Faculty of Veterinary Medicine, University of Calgary, 3330 Hospital Drive NW, Calgary, Alberta, T2N 4Z6, Canada.Faculty of Veterinary Medicine, University of Calgary, 3330 Hospital Drive NW, Calgary, Alberta, T2N 4Z6, Canada.Faculty of Veterinary Medicine, University of Calgary, 3330 Hospital Drive NW, Calgary, Alberta, T2N 4Z6, Canada. Electronic address: rleguill@ucalgary.ca.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

33375959

Citation

Massie, S L., et al. "Prevalence of Cardiac Arrhythmias and R-R Interval Variation in Healthy Thoroughbred Horses During Official Chuckwagon Races and Recovery." Veterinary Journal (London, England : 1997), vol. 267, 2021, p. 105583.
Massie SL, Bezugley RJ, McDonald KJ, et al. Prevalence of cardiac arrhythmias and R-R interval variation in healthy Thoroughbred horses during official Chuckwagon races and recovery. Vet J. 2021;267:105583.
Massie, S. L., Bezugley, R. J., McDonald, K. J., & Leguillette, R. (2021). Prevalence of cardiac arrhythmias and R-R interval variation in healthy Thoroughbred horses during official Chuckwagon races and recovery. Veterinary Journal (London, England : 1997), 267, 105583. https://doi.org/10.1016/j.tvjl.2020.105583
Massie SL, et al. Prevalence of Cardiac Arrhythmias and R-R Interval Variation in Healthy Thoroughbred Horses During Official Chuckwagon Races and Recovery. Vet J. 2021;267:105583. PubMed PMID: 33375959.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Prevalence of cardiac arrhythmias and R-R interval variation in healthy Thoroughbred horses during official Chuckwagon races and recovery. AU - Massie,S L, AU - Bezugley,R J, AU - McDonald,K J, AU - Leguillette,R, Y1 - 2020/11/28/ PY - 2020/04/30/received PY - 2020/11/12/revised PY - 2020/11/16/accepted PY - 2020/12/30/entrez PY - 2020/12/31/pubmed PY - 2021/4/23/medline KW - Arrhythmias KW - ECG KW - Equine KW - R-R intervals KW - Racing SP - 105583 EP - 105583 JF - Veterinary journal (London, England : 1997) JO - Vet J VL - 267 N2 - The prevalence and severity of cardiac arrhythmias in healthy racehorses undergoing competition is not well defined. The aim was to characterize arrhythmias in Thoroughbreds participating in official Chuckwagon races and to determine normal beat-to-beat (R-R) variability during supramaximal exercise. Electrocardiograph (ECG) recordings were obtained during pre-race, race, and active-recovery from 82 clinically healthy Thoroughbreds. ECG recordings were analyzed for arrhythmias and mean percent R-R deviation. Plasma lactate and high-sensitivity troponin (hs-cTnT) were also measured. Fifty-two ECGs were included in the analysis. Arrhythmias were seen in 48/52 horses (92%) and were predominantly isolated events. No complex rhythms were observed. During the race, 92% of horses had arrhythmias (81% supraventricular premature complex [SVPC]; 33% ventricular premature complex [VPC]). Eleven percent of racing arrhythmias were VPCs (all singlets except for two couplets). During active-recovery, 58% of horses had arrhythmias (56% SVPC; 15% VPCs): Three horses had VPC couplets and one horse had a VPC triplet. All plasma hs-cTnT were within normal limits. The measured lactate was 28.5 ± 4.5 mmol/L, confirming supramaximal exercise. R-R variation ranged between -9.5 to +18.8% during pre-race (mean heart rate [HR], 155 ± 22 beats per min [bpm]), -27.8 to +45.3% during racing (mean HR, 200 ± 9 bpm) and -16.4 to +40.1% during active-recovery (mean HR, 165 ± 14 bpm). Maximal and 1st percentile R-R shortening and lengthening were significantly greater at race than pre-race and active-recovery (P < 0.0001). Racing and active-recovery maximal R-R lengthening were significantly greater than pre-race (P = 0.0003). Supraventricular premature complexes and VPCs are prevalent in healthy horses undergoing Chuckwagon racing. R-R variation is greater during racing than has previously been described. SN - 1532-2971 UR - https://www.unboundmedicine.com/medline/citation/33375959/Prevalence_of_cardiac_arrhythmias_and_R_R_interval_variation_in_healthy_Thoroughbred_horses_during_official_Chuckwagon_races_and_recovery_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S1090-0233(20)30160-X DB - PRIME DP - Unbound Medicine ER -