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Dynamic endoscopy of the equine upper airway – what is significant?
  1. Gareth Trope, BVSc(Hons), DipVCS, CertES(Orth), FANZCVS
  1. School of Animal and Veterinary Sciences, Charles Sturty University, Locked Bag 588, Wagga Wagga, New South Wales 2678, Australia e-mail:
  1. gtrope{at}

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DYNAMIC upper respiratory collapse is a common cause of poor performance in horses (Dart and others 2001, Parente and others 2002, Tan and others 2005, Lane and others 2006). Dynamic endoscopy of the upper respiratory tract allows the identification of various obstructive conditions that endoscopy at rest is unable to identify. Until recently, this has only been achievable using high speed treadmill endoscopy (HSTE). This technique has allowed the identification of numerous obstructive conditions, including recurrent laryngeal neuropathy, intermittent dorsal displacement of the soft palate, axial deviation of the aryepiglottic folds, vocal fold collapse and, more recently, ventroaxial luxation of the apex of the corniculate process of the arytenoid cartilage (Kannegieter and Dore 1995, Dart and others 2001, 2005, Parente and others 2002, Tan and others 2005, Lane and others 2006, Davidson and others 2011). Some of the main criticisms of HSTE include an inability to recreate true racing/training conditions, the cost of the equipment, limited availability of high speed treadmills and the safety risk to both horse and handlers. The development …

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