Maintenance of arytenoid abduction following carbon dioxide laser debridement of the articular cartilage and joint capsule of the cricoarytenoid joint combined with prosthetic laryngoplasty in horses: an in vivo and in vitro study.
Authors: Hawkins J F, Couetil L, Miller M A
Journal: Veterinary journal (London, England : 1997)
Summary
# Editorial Summary: CO₂ Laser Debridement with Laryngoplasty for Recurrent Laryngeal Neuropathy Recurrent laryngeal neuropathy (RLN) remains a significant performance-limiting condition in horses, and whilst prosthetic laryngoplasty effectively restores airway patency, the arytenoid cartilage frequently loses abduction over time as fibrosis develops at the cricoarytenoid joint. Hawkins and colleagues investigated whether CO₂ laser debridement of the cricoarytenoid joint cartilage and capsule, combined with standard laryngoplasty, could prevent this post-operative deterioration in a prospective study of seven horses (five receiving laser treatment and two sham controls), employing endoscopic assessment, measurement of right-to-left arytenoid angle quotients (RLQ), and post-mortem aerodynamic and histopathological analysis. Whilst endoscopic RLQ measurements showed no significant difference between groups during the clinical follow-up period, post-mortem testing at physiological airflows revealed significantly higher RLQ values in sham-treated horses, suggesting greater maintenance of abduction in the laser-treated group, with histology demonstrating that the initial cartilage necrosis and inflammatory response eventually resolved into stable periarticular fibrosis. For practitioners managing RLN cases, these findings indicate that adjunctive CO₂ laser debridement of the cricoarytenoid joint offers a technically feasible approach to reduce the loss of arytenoid abduction that typically occurs following laryngoplasty alone, though the modest sample size warrants cautious interpretation and further investigation in larger cohorts.
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Practical Takeaways
- •CO2 laser debridement of the cricoarytenoid joint combined with laryngoplasty may help prevent the common post-operative loss of arytenoid abduction seen with laryngoplasty alone in horses with recurrent laryngeal neuropathy
- •The procedure induces cartilage necrosis and fibrosis that stabilizes over time without compromising airway flow, suggesting a biological mechanism for maintaining abduction
- •This combined approach warrants consideration for horses undergoing laryngoplasty, particularly those at high risk for abduction loss
Key Findings
- •CO2 laser debridement of the cricoarytenoid joint combined with prosthetic laryngoplasty maintained arytenoid abduction with no significant differences in endoscopic measurements from day 1 to study termination
- •Post-mortem testing showed significantly higher right-to-left angle quotients in sham-treated horses compared to laser-treated horses at 10 and 60 L/s airflows
- •Histopathology revealed necrosis and cartilage loss in laser-treated joints with progressive fibrosis and resolution of lymphoid infiltration over time
- •Translaryngeal impedance was not significantly different between groups, suggesting laser treatment does not impair airflow characteristics