Comparison of dynamic and resting endoscopy of the upper portion of the respiratory tract in 57 <scp>T</scp>horoughbred yearlings



Kelly, PG, Reardon, RJM, Johnston, MS and Pollock, PJ
(2013) Comparison of dynamic and resting endoscopy of the upper portion of the respiratory tract in 57 <scp>T</scp>horoughbred yearlings. Equine Veterinary Journal, 45 (6). pp. 700-704.

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Abstract

<jats:title>Summary</jats:title><jats:sec><jats:title>Reasons for performing the study</jats:title><jats:p>Endoscopic examination of <jats:styled-content style="fixed-case">T</jats:styled-content>horoughbred (<jats:styled-content style="fixed-case">TB</jats:styled-content>) yearlings is performed routinely to determine the suitability of horses for racing and to ensure that the conditions of sale are satisfied. However, previous research has demonstrated that resting endoscopic examination can be inaccurate in the diagnosis of functional pathology of the upper portion of the respiratory tract (<jats:styled-content style="fixed-case">URT</jats:styled-content>).</jats:p></jats:sec><jats:sec><jats:title>Objectives</jats:title><jats:p>To investigate the feasibility of performing dynamic overground endoscopy in a group of <jats:styled-content style="fixed-case">TB</jats:styled-content> yearlings and to compare the results of resting and dynamic endoscopic examination of the <jats:styled-content style="fixed-case">URT</jats:styled-content>.</jats:p></jats:sec><jats:sec><jats:title>Study design</jats:title><jats:p>Prospective cohort study.</jats:p></jats:sec><jats:sec><jats:title>Methods</jats:title><jats:p>Resting (pre‐ and post exercise) and exercising endoscopy was performed on 57 <jats:styled-content style="fixed-case">TB</jats:styled-content> yearlings at a single training yard. Observed abnormalities were recorded and graded. The results of resting and dynamic examination were compared.</jats:p></jats:sec><jats:sec><jats:title>Results</jats:title><jats:p>Dynamic overground endoscopy was well tolerated and was performed with few complications. Laryngeal asymmetry (29 cases) was the most common abnormality identified at rest, while intermittent dorsal displacement of the soft palate (<jats:styled-content style="fixed-case">IDDSP</jats:styled-content>; 19 cases) was the most common at exercise. Significant variation in laryngeal function and variation in the occurrence of <jats:styled-content style="fixed-case">IDDSP</jats:styled-content> was noted between examinations. Other potentially significant pathology that was not noted at rest but was present during exercise included collapse of the apex of the corniculate process, pharyngeal collapse and cricotracheal ligament collapse. The occurrence of <jats:styled-content style="fixed-case">IDDSP</jats:styled-content> at exercise was significantly associated with epiglottic structure <jats:italic>grade</jats:italic>&gt;<jats:italic>2</jats:italic> and a recent history of respiratory tract infection.</jats:p></jats:sec><jats:sec><jats:title>Conclusions</jats:title><jats:p>Dynamic overground endoscopy is safe and potentially useful when assessing <jats:styled-content style="fixed-case">URT</jats:styled-content> function in <jats:styled-content style="fixed-case">TB</jats:styled-content> yearlings. Significant variations in the results of endoscopy at rest and during exercise were identified, which indicate that resting endoscopy may not be sufficient to predict the occurrence of pathology during exercise.</jats:p></jats:sec><jats:sec><jats:title>Potential relevance</jats:title><jats:p>Dynamic overground endoscopic examination could be considered a suitable means of assessing <jats:styled-content style="fixed-case">URT</jats:styled-content> function in <jats:styled-content style="fixed-case">TB</jats:styled-content> yearlings and may provide additional pertinent information to that obtained during standard resting examination.</jats:p></jats:sec>

Item Type: Article
Depositing User: Symplectic Admin
Date Deposited: 17 Sep 2015 10:02
Last Modified: 31 Oct 2023 00:57
DOI: 10.1111/evj.12061
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/2026220