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Journal of veterinary internal medicine2017; 32(1); 433-440; doi: 10.1111/jvim.14870

24-Hour Kinetics of Cardiac Troponin-T Using a “High-Sensitivity” Assay in Thoroughbred Chuckwagon Racing Geldings after Race and Associated Clinical Sampling Guidelines.

Abstract: A "high-sensitivity" cardiac troponin-T (hscTnT) assay recently has been validated for use in horses and is a specific biomarker of myocardial damage. Postexercise release kinetics of cTnT utilizing the hscTnT assay have yet to be established in horses. Objective: To determine: (1) cTnT release kinetics in racing Thoroughbreds after a high-intensity 5/8th mile Chuckwagon race; (2) the effects of age on pre- and postrace cTnT concentrations; and (3) sampling guidelines for clinicians evaluating horses presenting after exercise. Methods: Samples were obtained from 38 Thoroughbred geldings aged 5-16 years before racing and immediately, 2, 3, 4, 6, 12, and 24 hour postrace. Methods: Prospective, observational study with convenience sampling. A fifth-generation hscTnT assay was used for plasma sample analysis, and concentrations were compared at all time-points. Correlations were determined between cTnT concentrations and age. Biochemistry analysis was performed to assess rhabdomyolysis, renal failure, and exercise-induced dehydration. Results: All horses with measureable cTnT concentrations had significant postexercise increases in cTnT with a median peak (8.0 ng/L) at 3-hour postrace. All horses had peak postexercise cTnT concentrations 2- to 6-hour postrace ≤ the 99th percentile upper reference limit of 23.2 ng/L, after which all cTnT concentrations decreased until returning to baseline by 12-24 hours. There was no correlation over time between cTnT concentrations and age. Conclusions: In racing Thoroughbreds completing short-duration, high-intensity Chuckwagon races, cTnT concentrations are expected to be increased 2- to 6-hour postrace and to decrease by 12-24 hours while remaining ≤23.2 ng/L throughout. This study contributes to establishing guidelines for clinical use of the hscTnT assay in exercising horses.
Publication Date: 2017-11-24 PubMed ID: 29171090PubMed Central: PMC5787185DOI: 10.1111/jvim.14870Google Scholar: Lookup
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  • Journal Article

Summary

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The research article discusses the use of high-sensitivity cardiac troponin-T (hscTnT) assay to study the release kinetics of a specific biomarker of myocardial damage in thoroughbred racing horses, and its potential application in setting clinical guidelines. The researchers noted that the levels of this biomarker increased post-race in the studied horses, but typically returned to baseline within 12-24 hours, while not exceeding a certain reference limit.

Study Purpose and Objectives

  • The primary aim of the research was to understand the release kinetics of the cardiac troponin-T (cTnT) in racing thoroughbreds post a high-intensity race involving Chuckwagon style racing.
  • The study also aimed to determine the impact of age on pre- and post-race cTnT concentrations.
  • Finally, the study sought to form sampling guidelines for vets and clinicians evaluating horses after their exercise or racing events.

Methods and Experimentation

  • To achieve the stated objectives, the researchers collected samples from 38 Thoroughbred geldings aged between 5-16 years, before and immediately, 2, 3, 4, 6, 12, and 24 hours after racing.
  • A prospective, observational study was used with convenience sampling.
  • They utilized a fifth-generation hscTnT assay for analysis of the plasma samples, and compared concentrations at all prescribed time-points.
  • They also checked for a correlation between the cTnT concentrations and the horses’ age.
  • In addition, they completed a biochemistry analysis to assess signs of rhabdomyolysis (damage to skeletal muscles), renal failure, and exercise-induced dehydration.

Key Results and Findings

  • All horses that had measurable cTnT concentrations exhibited significant post-exercise increases in cTnT.
  • Peak cTnT levels were observed at 3 hour post-race at a median concentration of 8.0 ng/L.
  • All horses had peak cTnT concentrations between 2-6 hours post-race which maintained under the 99th percentile upper reference limit of 23.2 ng/L.
  • After this peak, all cTnT concentrations started decreasing and returned to baseline between 12-24 hours post-race.
  • The study found no correlation between cTnT concentrations and age over time.

Conclusion and Implication

  • This signifies that in racing Thoroughbreds undertaking short-duration, high-intensity Chuckwagon races, it should be anticipated to find increased cTnT concentrations 2- to 6-hours post-race, which would normalize by 12-24 hours.
  • The study’s findings are crucial in setting guidelines for the clinical application of the hscTnT assay in examining exercising horses or those taking part in competitive racing.

Cite This Article

APA
Shields E, Seiden-Long I, Massie S, Leguillette R. (2017). 24-Hour Kinetics of Cardiac Troponin-T Using a “High-Sensitivity” Assay in Thoroughbred Chuckwagon Racing Geldings after Race and Associated Clinical Sampling Guidelines. J Vet Intern Med, 32(1), 433-440. https://doi.org/10.1111/jvim.14870

Publication

ISSN: 1939-1676
NlmUniqueID: 8708660
Country: United States
Language: English
Volume: 32
Issue: 1
Pages: 433-440

Researcher Affiliations

Shields, E
  • Faculty of Veterinary Medicine (UCVM), University of Calgary, Calgary, Alberta, Canada.
Seiden-Long, I
  • Faculty of Medicine and Calgary Lab Services (CLS), University of Calgary, Calgary, Alberta, Canada.
Massie, S
  • Faculty of Veterinary Medicine (UCVM), University of Calgary, Calgary, Alberta, Canada.
Leguillette, R
  • Faculty of Veterinary Medicine (UCVM), University of Calgary, Calgary, Alberta, Canada.

MeSH Terms

  • Age Factors
  • Animals
  • Biomarkers
  • Guidelines as Topic
  • Horses / blood
  • Immunoassay / methods
  • Immunoassay / veterinary
  • Kinetics
  • Male
  • Physical Exertion / physiology
  • Prospective Studies
  • Running
  • Time Factors
  • Troponin T / blood

Conflict of Interest Statement

Authors declare no conflict of interest.

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Citations

This article has been cited 5 times.
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