Endoscopy is a minimally medical procedure using an illuminated fiber optic flexible tubular instrument called an endoscope to view the interior of a hollow organ or part, such as the upper airways. The upper airways of the horse are from the nose through the nasal passages to the larynx. Endoscopy during the treadmill test is used to visualize the larynx to diagnose possible causes of exercise intolerance such as displacement of the soft palate, epiglottic entrapment, and laryngeal hemiplegia.

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