Endoscopy has enabled detailed investigation of the structure and function of internal organs and tissues. This technology is of particular relevance to our equine patients and has greatly enhanced our knowledge and understanding of the horse’s respiratory tract. A horse that is unable to breathe normally is not capable of work or strenuous exercise. Respiratory noise has long been associated with potential poor performance in race horses. “Roarer” and “gurgler” are terms which were used to describe the abnormal sounds associated with poor respiratory tract function and performance. Endoscopic examination and more lately video-endoscopic examination have enabled observation and scientific diagnosis of these abnormalities. The significance of these diseases on the performance of racehorses has lead to routine endoscopic examination at yearling sales around the world.
![]() |
|
Normal endoscopic appearance of the upper respiratory tract of a horse. Note wide and synchronous opening of the larynx providing maximum airflow to the lungs for oxygen exchange |



