Abstract
Background: Yearling laryngeal function (YLF) is frequently assessed at the time of sale
and the outcomes of these assessments can have significant economic implications.
The YLF of horses that subsequently underwent a prosthetic laryngoplasty
(PL) is unknown.
Objectives: We hypothesised horses with YLF ≥grade II.2 would be at increased risk
of requiring PL, compared with YLF <grade II.2.
Study design: Case–control.
Methods: There were 150 PL cases from 2019 to 2021 with an available yearling postsale
videoendoscopic examination and 600 controls. Two observers unaware of the outcome
graded YLF using the Havemeyer system. The risk of PL for each YLF grade was
calculated using multivariable conditional logistic regression.
Results: The proportions of each YLF grade in the control group and PL group,
respectively, were grade I: 25.8% and 13.3%, grade II.1: 54.3% and 35.3%, grade
II.2: 16.7% and 26%, grade III.1: 3% and 20.7%, grade III.2: 0.2% and 3.3%,
grade III.3: 0% and 0.7%, grade IV: 0% and 0.7%. The odds ratio (OR, 95% confidence
interval) of requiring PL compared with the referent grade I were: grade
II.1: 1.2 (0.7, 2.2, p = 0.5), grade II.2: 3.4 (1.8, 6.1, p < 0.001), grade III.1: 13.8
(6.0, 31.6, p < 0.001), grade III.2: 55.5 (10.3, 299.2, p < 0.001), grade III.3:
2930,000 (398173.7, 21 600,000, p < 0.001), grade IV: 26300,000 (3 420 000,
202 000 000, p < 0.001). Yearling LF ≥grade II.2 had an OR of 4.61 (3.0, 7.1,
p < 0.001) compared with <grade II.2; YLF ≥grade III.1 had an OR of 10.7
(5.6, 20.4, p < 0.001) compared with <grade III.1.
Main limitations: Lack of performance data to compare the PL and control groups.
The control group was not ‘disease-free’ and may have developed disease and been
retired or undergone surgery elsewhere.
Conclusions: Three-quarters of the PL group had ≤grade II.2 YLF, demonstrating
deterioration in LF post-sale was common. The risk of requiring PL increased from
YLF grade II.2 upwards.
and the outcomes of these assessments can have significant economic implications.
The YLF of horses that subsequently underwent a prosthetic laryngoplasty
(PL) is unknown.
Objectives: We hypothesised horses with YLF ≥grade II.2 would be at increased risk
of requiring PL, compared with YLF <grade II.2.
Study design: Case–control.
Methods: There were 150 PL cases from 2019 to 2021 with an available yearling postsale
videoendoscopic examination and 600 controls. Two observers unaware of the outcome
graded YLF using the Havemeyer system. The risk of PL for each YLF grade was
calculated using multivariable conditional logistic regression.
Results: The proportions of each YLF grade in the control group and PL group,
respectively, were grade I: 25.8% and 13.3%, grade II.1: 54.3% and 35.3%, grade
II.2: 16.7% and 26%, grade III.1: 3% and 20.7%, grade III.2: 0.2% and 3.3%,
grade III.3: 0% and 0.7%, grade IV: 0% and 0.7%. The odds ratio (OR, 95% confidence
interval) of requiring PL compared with the referent grade I were: grade
II.1: 1.2 (0.7, 2.2, p = 0.5), grade II.2: 3.4 (1.8, 6.1, p < 0.001), grade III.1: 13.8
(6.0, 31.6, p < 0.001), grade III.2: 55.5 (10.3, 299.2, p < 0.001), grade III.3:
2930,000 (398173.7, 21 600,000, p < 0.001), grade IV: 26300,000 (3 420 000,
202 000 000, p < 0.001). Yearling LF ≥grade II.2 had an OR of 4.61 (3.0, 7.1,
p < 0.001) compared with <grade II.2; YLF ≥grade III.1 had an OR of 10.7
(5.6, 20.4, p < 0.001) compared with <grade III.1.
Main limitations: Lack of performance data to compare the PL and control groups.
The control group was not ‘disease-free’ and may have developed disease and been
retired or undergone surgery elsewhere.
Conclusions: Three-quarters of the PL group had ≤grade II.2 YLF, demonstrating
deterioration in LF post-sale was common. The risk of requiring PL increased from
YLF grade II.2 upwards.
| Original language | English |
|---|---|
| Journal | Equine Veterinary Journal |
| DOIs | |
| Publication status | Published - 7 Jun 2024 |
Bibliographical note
Publisher Copyright:© 2024 The Author(s). Equine Veterinary Journal published by John Wiley & Sons Ltd on behalf of EVJ Ltd.
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