A first step towards objective grading of equine laryngeal function
Year: 2024
Type: article
Abstract: Due to concerns about disagreement between veterinarians when grading resting laryngeal function (LF), a diagnostic decision tree (DDT) has been developed by codifying the Havemeyer grading system and objectively defining certain terms to remove ambiguity. Videoendoscopic examinations of the equine larynx that had previously been assigned a unanimous LF grade by 3 experienced observers were used to develop the DDT and determine the cut-off values. The DDT is a flow chart consisting of a series of dichotomous (yes/no) decisions, to dictate the order of decision making and direct the observer down a pathway towards the most appropriate LF grade. To use the DDT, the observer must know the frame rate of the video and use frame-by-frame video playback when reviewing the videos. The first decision involves determining if full left arytenoid cartilage (LAC) abduction is achieved (≤ grade III.1), or not achieved (> grade III.1). Maintained full LAC abduction (≤ grade II.2) is defined as maintenance of full abduction for ≥ 0.2 seconds. Full LAC abduction that is achieved but not maintained (grade III.1) is defined as maintenance of full abduction for < 0.2 seconds. Arytenoid abductor deficit is categorized into left arytenoid abduction ≥45° from vertical midline (grade III.2) and <45° abduction (grade III.3). The DDT could be used as a first step towards computer assisted laryngeal function grading. • The development an objective approach to grading equine laryngeal function is described. • The Havemeyer system was restructured into a decision tree of yes/no questions. • Grade II.2 was defined as maintenance of full left arytenoid abduction for ≥ 0.2 s. • Grade III.1 was defined as maintenance of full left arytenoid abduction for < 0.2 s.
Source: The Veterinary Journal
Language: English
Subfield: Equine
Field: Veterinary
Domain: Health Sciences
Open Access status: hybrid
Estimated APC paid: $3,370
OpenAlex ID: W4403808979