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Dynamic obstructions of the equine upper respiratory tract. Part 2: comparison of endoscopic findings at rest and during high-speed treadmill exercise of 600 Thoroughbred racehorses.
Equine Vet J. 2006 Sep; 38(5):401-7.EV

Abstract

REASONS FOR PERFORMING STUDY

The reliability of diagnoses of obstructive conditions of the upper respiratory tract (URT) based on examinations performed at rest vs. at exercise is controversial.

OBJECTIVE

To compare diagnosis of URT by endoscopy at rest with that achieved during high-speed treadmill exercise (HSTE).

HYPOTHESIS

Endoscopy of URT at rest, when performed in isolation from other simpler techniques is unreliable in the prediction of dynamic respiratory obstructions.

METHODS

Endoscopic findings of 600 Thoroughbred racehorses during quiet breathing were compared with findings during high-speed treadmill exercise. Other parameters were also assessed for their specificity in diagnosis.

RESULTS

Endoscopy of the resting horse showed low sensitivity (0.15) in the diagnosis of dorsal displacement of the soft palate (DDSP) and palatal instability (PI). When endoscopy and reported noises were taken together there was still a 35% misdiagnosis rate. Although there was significant association between resting laryngeal function score (LFS) and dynamic vocal cord and/or arytenoid cartilage collapse at exercise, 19% of horses with a grade 4/5 LFS were able to attain and maintain full abduction during exercise and 7% of those with 'normal' grades 1 or 2 LFS at rest showed dynamic laryngeal collapse when exerted. Sensitivity of the diagnostic model was greatly increased (80%) when a history of inspiratory noise and palpable intrinsic muscle atrophy were included.

CONCLUSIONS AND POTENTIAL RELEVANCE

Endoscopy of the upper respiratory tract of static horses is unreliable in the diagnosis of dynamic obstructions of the URT and should not be used in isolation in surgical decision-making or in the assessment of horses at the time of sale.

Authors+Show Affiliations

Department of Clinical Veterinary Science, University of Bristol, Langford, UK.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

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

Language

eng

PubMed ID

16986599

Citation

Lane, J G., et al. "Dynamic Obstructions of the Equine Upper Respiratory Tract. Part 2: Comparison of Endoscopic Findings at Rest and During High-speed Treadmill Exercise of 600 Thoroughbred Racehorses." Equine Veterinary Journal, vol. 38, no. 5, 2006, pp. 401-7.
Lane JG, Bladon B, Little DR, et al. Dynamic obstructions of the equine upper respiratory tract. Part 2: comparison of endoscopic findings at rest and during high-speed treadmill exercise of 600 Thoroughbred racehorses. Equine Vet J. 2006;38(5):401-7.
Lane, J. G., Bladon, B., Little, D. R., Naylor, J. R., & Franklin, S. H. (2006). Dynamic obstructions of the equine upper respiratory tract. Part 2: comparison of endoscopic findings at rest and during high-speed treadmill exercise of 600 Thoroughbred racehorses. Equine Veterinary Journal, 38(5), 401-7.
Lane JG, et al. Dynamic Obstructions of the Equine Upper Respiratory Tract. Part 2: Comparison of Endoscopic Findings at Rest and During High-speed Treadmill Exercise of 600 Thoroughbred Racehorses. Equine Vet J. 2006;38(5):401-7. PubMed PMID: 16986599.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Dynamic obstructions of the equine upper respiratory tract. Part 2: comparison of endoscopic findings at rest and during high-speed treadmill exercise of 600 Thoroughbred racehorses. AU - Lane,J G, AU - Bladon,B, AU - Little,D R M, AU - Naylor,J R J, AU - Franklin,S H, PY - 2006/9/22/pubmed PY - 2006/10/25/medline PY - 2006/9/22/entrez SP - 401 EP - 7 JF - Equine veterinary journal JO - Equine Vet J VL - 38 IS - 5 N2 - REASONS FOR PERFORMING STUDY: The reliability of diagnoses of obstructive conditions of the upper respiratory tract (URT) based on examinations performed at rest vs. at exercise is controversial. OBJECTIVE: To compare diagnosis of URT by endoscopy at rest with that achieved during high-speed treadmill exercise (HSTE). HYPOTHESIS: Endoscopy of URT at rest, when performed in isolation from other simpler techniques is unreliable in the prediction of dynamic respiratory obstructions. METHODS: Endoscopic findings of 600 Thoroughbred racehorses during quiet breathing were compared with findings during high-speed treadmill exercise. Other parameters were also assessed for their specificity in diagnosis. RESULTS: Endoscopy of the resting horse showed low sensitivity (0.15) in the diagnosis of dorsal displacement of the soft palate (DDSP) and palatal instability (PI). When endoscopy and reported noises were taken together there was still a 35% misdiagnosis rate. Although there was significant association between resting laryngeal function score (LFS) and dynamic vocal cord and/or arytenoid cartilage collapse at exercise, 19% of horses with a grade 4/5 LFS were able to attain and maintain full abduction during exercise and 7% of those with 'normal' grades 1 or 2 LFS at rest showed dynamic laryngeal collapse when exerted. Sensitivity of the diagnostic model was greatly increased (80%) when a history of inspiratory noise and palpable intrinsic muscle atrophy were included. CONCLUSIONS AND POTENTIAL RELEVANCE: Endoscopy of the upper respiratory tract of static horses is unreliable in the diagnosis of dynamic obstructions of the URT and should not be used in isolation in surgical decision-making or in the assessment of horses at the time of sale. SN - 0425-1644 UR - https://www.unboundmedicine.com/medline/citation/16986599/Dynamic_obstructions_of_the_equine_upper_respiratory_tract__Part_2:_comparison_of_endoscopic_findings_at_rest_and_during_high_speed_treadmill_exercise_of_600_Thoroughbred_racehorses_ L2 - https://onlinelibrary.wiley.com/resolve/openurl?genre=article&sid=nlm:pubmed&issn=0425-1644&date=2006&volume=38&issue=5&spage=401 DB - PRIME DP - Unbound Medicine ER -