• 1. Witte TH, Mohammed HO, Radcliffe CH, et al. Racing performance after combined prosthetic laryngoplasty and ipsilateral ventriculocordectomy or partial arytenoidectomy: 135 Thoroughbred racehorses competing at less than 2400 m (1997–2007). Equine Vet J 2009;41:7075.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 2. Hawkins JF, Tulleners EP, Ross MW, et al. Laryngoplasty with or without ventriculectomy for treatment of left laryngeal hemiplegia in 230 racehorses. Vet Surg 1997;26:484491.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 3. Mason BJ, Riggs CM, Cogger N. Cohort study examining long-term respiratory health, career duration and racing performance in racehorses that undergo left-sided prosthetic laryngoplasty and ventriculocordectomy surgery for treatment of left-sided laryngeal hemiplegia. Equine Vet J 2013;45:229234.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 4. Hahn CN, Matiasek K, Dixon PM, et al. Histological and ultrastructural evidence that recurrent laryngeal neuropathy is a bilateral mononeuropathy limited to recurrent laryngeal nerves. Equine Vet J 2008;40:666672.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 5. Dixon PM, McGorum BC, Railton DI, et al. Clinical and endoscopic evidence of progression in 152 cases of equine recurrent laryngeal neuropathy (RLN). Equine Vet J 2002;34:2934.

    • Search Google Scholar
    • Export Citation
  • 6. Compostella F, Tremaine WH, Franklin SH. Retrospective study investigating causes of abnormal respiratory noise in horses following prosthetic laryngoplasty. Equine Vet J Suppl 2012;43:2730.

    • Search Google Scholar
    • Export Citation
  • 7. Leutton JL, Lumsden JM. Dynamic respiratory endoscopic findings pre- and post laryngoplasty in Thoroughbred racehorses. Equine Vet J 2015;47:531536.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 8. Fulton IC, Derksen FJ, Stick JA, et al. Treatment of left laryngeal hemiplegia in Standardbreds, using a nerve muscle pedicle graft. Am J Vet Res 1991;52:14611467.

    • Search Google Scholar
    • Export Citation
  • 9. Raffetto JA, Wearn JG, Fischer AT Jr. Racing performance following prosthetic laryngoplasty using a polyurethane prosthesis combined with a laser-assisted ventriculocordectomy for treatment of recurrent laryngeal neuropathy in 78 Thoroughbred racehorses. Equine Vet J 2015;47:6064.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 10. Robinson NE. Consensus statements on equine recurrent laryngeal neuropathy: conclusions of the Havemeyer Workshop. Equine Vet Educ 2004;16:333336.

    • Search Google Scholar
    • Export Citation
  • 11. Carpenter RS, McIlwraith CW, Hill AE. Racing performance in 72 racehorses treated with prosthetic laryngoplasty for laryngeal hemiplegia. J Equine Vet Sci 2009;29:584589.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 12. Strand E, Martin GS, Haynes PF, et al. Career racing performance in Thoroughbreds treated with prosthetic laryngoplasty for laryngeal neuropathy: 52 cases (1981–1989). J Am Vet Med Assoc 2000;217:16891696.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 13. Nielsen BD, Turner KK, Ventura BA, et al. Racing speeds of Quarter Horses, Thoroughbreds and Arabians. Equine Vet J Suppl 2006;36:128132.

    • Search Google Scholar
    • Export Citation
  • 14. Davidson EJ, Martin BB, Rieger RH, et al. Exercising video-endoscopic evaluation of 45 horses with respiratory noise and/or poor performance after laryngoplasty. Vet Surg 2010;39:942948.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 15. Barnett TP, O'Leary JM, Parkin TD, et al. Long-term exercising video-endoscopic examination of the upper airway following laryngoplasty surgery: a prospective cross-sectional study of 41 horses. Equine Vet J 2013;45:593597.

    • Crossref
    • Search Google Scholar
    • Export Citation

Advertisement

A retrospective cohort study of racing performance in Quarter Horses undergoing prosthetic laryngoplasty for treatment of recurrent laryngeal neuropathy

Clarisa R. KruegerDepartment of Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO, 80523.

Search for other papers by Clarisa R. Krueger in
Current site
Google Scholar
PubMed
Close
 DVM, MS
,
Robert D. LewisElgin Veterinary Hospital, 600 Hwy 290 W, Elgin, TX 78621.

Search for other papers by Robert D. Lewis in
Current site
Google Scholar
PubMed
Close
 DVM
,
C. Wayne McIlwraithDepartment of Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO, 80523.
Equine Medical Center, 10542 Walker St, Cypress, CA 90630.

Search for other papers by C. Wayne McIlwraith in
Current site
Google Scholar
PubMed
Close
 BVSc, PhD
,
Michael D. MajorOakridge Equine Hospital, 6675 E Waterloo Rd, Edmond, OK 73034.

Search for other papers by Michael D. Major in
Current site
Google Scholar
PubMed
Close
 DVM, MS
,
Jeffrey E. BrakenhoffOakridge Equine Hospital, 6675 E Waterloo Rd, Edmond, OK 73034.

Search for other papers by Jeffrey E. Brakenhoff in
Current site
Google Scholar
PubMed
Close
 DVM
,
D. Reese HandEquine Sports Medicine and Surgery, 2991 W Interstate 20 S Frontage Rd, Weatherford, TX 76087.

Search for other papers by D. Reese Hand in
Current site
Google Scholar
PubMed
Close
 DVM
,
Aileen L. RowlandEquine Sports Medicine and Surgery, 2991 W Interstate 20 S Frontage Rd, Weatherford, TX 76087.

Search for other papers by Aileen L. Rowland in
Current site
Google Scholar
PubMed
Close
 DVM
,
Ann M. HessDepartment of Statistics, College of Natural Sciences, Colorado State University, Fort Collins, CO, 80523.

Search for other papers by Ann M. Hess in
Current site
Google Scholar
PubMed
Close
 PhD
,
Samuel W. JohnsonDepartment of Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO, 80523.

Search for other papers by Samuel W. Johnson in
Current site
Google Scholar
PubMed
Close
 DVM
, and
Eileen S. HackettDepartment of Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO, 80523.

Search for other papers by Eileen S. Hackett in
Current site
Google Scholar
PubMed
Close
 DVM, PhD

Abstract

OBJECTIVE To determine effects of prosthetic laryngoplasty on return to racing, performance index, and career longevity in racing Quarter Horses with recurrent laryngeal neuropathy (RLN) and to evaluate performance variables for horses with RLN undergoing prosthetic laryngoplasty, compared with a control horse population.

DESIGN Multicenter, retrospective cohort study.

ANIMALS 162 racing Quarter Horses with RLN treated with prosthetic laryngoplasty (case horses) and 324 racing Quarter Horse without RLN (control horses).

PROCEDURES Medical and race records of case and control horses examined at 5 referral centers between January 2000 and December 2015 were reviewed retrospectively. Two control horses were matched with each case horse. Return to racing, earnings, number of racing starts, performance index, and career longevity were evaluated.

RESULTS The odds of returning to racing did not differ significantly between case and control horses but decreased with increasing age. Neither racing starts nor career longevity were affected by prosthetic laryngoplasty or by RLN grade. In fact, horses undergoing laryngoplasty for treatment of RLN and horses with the lowest RLN grade before surgery had higher performance indices after the surgery, compared with indices for control horses.

CONCLUSIONS AND CLINICAL RELEVANCE The faster speeds and shorter distances raced with Quarter Horses could alter how RLN impacts respiratory variables and performance in Quarter Horses, compared with other racehorse breeds. Further study is needed to understand the impacts of RLN and surgical treatments for RLN in racing Quarter Horses.

Abstract

OBJECTIVE To determine effects of prosthetic laryngoplasty on return to racing, performance index, and career longevity in racing Quarter Horses with recurrent laryngeal neuropathy (RLN) and to evaluate performance variables for horses with RLN undergoing prosthetic laryngoplasty, compared with a control horse population.

DESIGN Multicenter, retrospective cohort study.

ANIMALS 162 racing Quarter Horses with RLN treated with prosthetic laryngoplasty (case horses) and 324 racing Quarter Horse without RLN (control horses).

PROCEDURES Medical and race records of case and control horses examined at 5 referral centers between January 2000 and December 2015 were reviewed retrospectively. Two control horses were matched with each case horse. Return to racing, earnings, number of racing starts, performance index, and career longevity were evaluated.

RESULTS The odds of returning to racing did not differ significantly between case and control horses but decreased with increasing age. Neither racing starts nor career longevity were affected by prosthetic laryngoplasty or by RLN grade. In fact, horses undergoing laryngoplasty for treatment of RLN and horses with the lowest RLN grade before surgery had higher performance indices after the surgery, compared with indices for control horses.

CONCLUSIONS AND CLINICAL RELEVANCE The faster speeds and shorter distances raced with Quarter Horses could alter how RLN impacts respiratory variables and performance in Quarter Horses, compared with other racehorse breeds. Further study is needed to understand the impacts of RLN and surgical treatments for RLN in racing Quarter Horses.

Contributor Notes

Address correspondence to Dr. Hackett (Eileen.Hackett@colostate.edu).