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Comparison of two techniques for transpharyngeal endoscopic auditory tube diverticulotomy in the horse
Drew W. Koch1, Jeremiah T. Easley1, Brad B. Nelson1, Jeremy J. Delcambre2, Erin G. McCready1, Eileen S. Hackett1,*
1Department of Clinical Sciences, 300 West Drake Road, Colorado State University, Fort Collins, CO 80523, USA
2Department of Biomedical Sciences, 1350 Center Avenue, Colorado State University, Fort Collins, CO 80523, USA
Correspondence to: Tel: +1-970-297-4035; Fax: +1-970-297-1274; E-mail: Eileen.Hackett@colostate.edu
Received: April 26, 2018; Revised: August 22, 2018; Accepted: August 27, 2018; Published online: August 30, 2018.
Auditory tube diverticula, also known as guttural pouches, are naturally occurring dilations of the auditory tube in horses that communicate with the nasopharynx through a small ostium. Infection and select other conditions can result in inflammation and narrowing of the nasopharyngeal ostium, which prevents drainage of fluid or egress of air and can lead to persistent infection or guttural pouch tympany. Auditory tube diverticulotomy allows continuous egress from the auditory tube diverticula and is a feature of disease treatment in horses, in which medical treatment alone is not successful. Transpharyngeal endoscopic auditory tube diverticulotomy was performed using a diode laser either at a single dorsal pharyngeal recess location, or bilaterally caudal to the nasopharyngeal ostium in 10 horse head specimens. Both methods resulted in clear communication between the nasopharynx and auditory tube diverticula. Diverticulotomy performed in the dorsal pharyngeal recess required less laser energy and activation time, and had a shorter surgical duration than diverticulotomy performed caudal to the nasopharyngeal ostium. Further study is warranted relative to the clinical application of both techniques.
Keywords: guttural pouch, empyema, chondroid, diode lasers, laser surgery, endoscopic surgical procedure

© 2018 The Korean Society of Veterinary Science.