Document Detail

Dynamic respiratory videoendoscopy in ridden sport horses: effect of head flexion, riding and airway inflammation in 129 cases.
MedLine Citation:
PMID:  22082441     Owner:  NLM     Status:  MEDLINE    
REASONS FOR PERFORMING STUDY: Dynamic upper airway obstruction (UAO) is a cause of respiratory noise and sometimes poor performance in sport horses. Riding, head flexion and airway inflammation may impact upper respiratory tract stability during exercise.
OBJECTIVES: To evaluate upper airway mechanical behaviour in ridden sport horses using overground endoscopy and the effect of head flexion, rider intervention and underlying airway inflammation on the pharynx and larynx.
METHODS: Resting and exercising videoendoscopic recordings during ridden exercise were obtained in 129 sport horses referred mainly for respiratory noise, poor performance or routine evaluation. The rider modified poll flexion and way of riding during the test and associated changes in UAO were recorded. Presence of upper and lower airway inflammation was also assessed.
RESULTS: Dynamic UAO was diagnosed in 91% (64/70) of the horses referred for respiratory noise and in 71% (29/41) of horses referred for poor performance. Pharyngeal instability was the most frequently diagnosed problem. However, differences were observed between dressage horses and showjumpers. Rider interaction and head flexion exacerbated upper airway instability and promoted the occurrence of complex UAO. Both lower airway inflammation and pharyngeal lymphoid hyperplasia were associated with pharyngeal instability, but not with any other UAO.
CONCLUSIONS: Rider intervention during ridden exercise (i.e. the various movements a horse might be asked to perform) influences upper airway morphology and function and, in cases of upper airway dynamic obstruction, can contribute to increasing laryngeal and/or pharyngeal instability in sport horses.
POTENTIAL RELEVANCE: As these are changes that would not usually be seen with treadmill videoendoscopy, ridden videoendoscopy should be the preferred method for evaluation of the upper airway in sport horses.
E Van Erck
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Equine veterinary journal. Supplement     Volume:  -     ISSN:  -     ISO Abbreviation:  Equine Vet J Suppl     Publication Date:  2011 Nov 
Date Detail:
Created Date:  2011-11-15     Completed Date:  2012-03-19     Revised Date:  2014-07-30    
Medline Journal Info:
Nlm Unique ID:  9614088     Medline TA:  Equine Vet J Suppl     Country:  United States    
Other Details:
Languages:  eng     Pagination:  18-24     Citation Subset:  IM    
Copyright Information:
© 2011 EVJ Ltd.
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MeSH Terms
Endoscopy / veterinary*
Horse Diseases / etiology,  pathology*
Inflammation / pathology,  veterinary*
Respiratory System / pathology*
Respiratory Tract Diseases / pathology,  veterinary*
Video Recording / methods*

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

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