Document Detail

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.
MedLine Citation:
PMID:  16986599     Owner:  NLM     Status:  MEDLINE    
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.
J G Lane; B Bladon; D R M Little; J R J Naylor; S H Franklin
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Equine veterinary journal     Volume:  38     ISSN:  0425-1644     ISO Abbreviation:  Equine Vet. J.     Publication Date:  2006 Sep 
Date Detail:
Created Date:  2006-09-21     Completed Date:  2006-10-24     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0173320     Medline TA:  Equine Vet J     Country:  England    
Other Details:
Languages:  eng     Pagination:  401-7     Citation Subset:  IM    
Department of Clinical Veterinary Science, University of Bristol, Langford, UK.
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MeSH Terms
Age Factors
Airway Obstruction / diagnosis,  etiology,  veterinary*
Arytenoid Cartilage / physiopathology
Diagnosis, Differential
Endoscopy / methods,  veterinary*
Exercise Test / veterinary
Horse Diseases / diagnosis*,  etiology
Larynx / abnormalities,  physiopathology
Nasopharynx / abnormalities,  physiopathology
Palate, Soft / abnormalities,  physiopathology
Physical Conditioning, Animal / physiology*
Respiratory Sounds / diagnosis,  physiopathology,  veterinary
Respiratory System Abnormalities / diagnosis,  physiopathology,  veterinary*
Rest / physiology*
Retrospective Studies
Sensitivity and Specificity
Severity of Illness Index
Video Recording

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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