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  Discussion on Research Summary: Post-op Evaluation of Laryngoplasty
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DrO

Posted on Saturday, Mar 16, 2013 - 8:44 am:

It is not surprising that there is some loss of arytenoid abduction following surgery but what is surprising is that the assessment of degree of loss does not correlate well with problems breathing during exercise.
DrO

Vet Surg. 2013 Mar 1.
Long-Term Maintenance of Arytenoid Cartilage Abduction and Stability During Exercise After Laryngoplasty in 33 Horses.
Barnett TP, O'leary JM, Parkin TD, Dixon PM, Barakzai SZ.

Royal (Dick) School of Veterinary Studies, Easter Bush Veterinary Centre, University of Edinburgh, Roslin, UK.
Abstract

OBJECTIVES:
To (1) assess long-term maintenance of arytenoid cartilage abduction (ACA) after laryngoplasty (LP); and (2) correlate the residual grade of ACA and postoperative abductory loss with arytenoid cartilage stability (ACS) during exercise.

STUDY DESIGN:
Case series.

ANIMALS:
Horses re-examined after laryngoplasty (n = 33).

METHODS:
Of 89 LP horses (2005-2010), 33 had historic ACA data available and upper airway endoscopy at rest and during over-ground exercise (mean, 33 months; range, 4-71 months) after surgery. ACA grade at 1 and 6 weeks postoperatively were correlated to long-term ACA grade. Effects of long-term ACA grade and magnitude of postoperative abductory loss on ACS during exercise were investigated.

RESULTS:
Median ACA grade at 1 week (n = 33) was 2, reducing to grade 3 by week 6 (n = 16). Grade 3 abduction was maintained in the long-term. Correlation between ACA at 1 week and the long-term was poor (ρ = .43, P = .1), but there was good correlation between week 6 and long-term (ρ = .89, P < .001). Arytenoid cartilage instability was observed during exercise in 7/33 of horses, and not significantly associated with the ACA grade (P = .50), or the number of grades of ACA lost (P = .64).

CONCLUSIONS:
Limited abductory loss occurs after 6 weeks postoperatively. Resting ACA grade was not a useful predictor of ACS during exercise.
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