In vitro model for testing novel implants for equine laryngoplasty.
Authors: Cheetham Jon, Witte Thomas H, Soderholm Leo V, Hermanson John W, Ducharme Norm G
Journal: Veterinary surgery : VS
Summary
# Editorial summary Recurrent laryngeal neuropathy remains a significant performance-limiting condition in racehorses and sport horses, yet prosthetic laryngoplasty techniques have seen limited innovation in recent decades. Cheetham and colleagues addressed this gap by developing an in vitro model using cadaveric equine larynges mounted in a flow chamber system, applying bilateral Fiberwire sutures for maximal arytenoid abduction whilst cycling airflow at 2 Hz to replicate the pressures and flow rates horses experience during maximal exercise. The system successfully reproduced inspiratory tracheal pressures of approximately −35 mm Hg at flow rates around 51–54 L/s, with translaryngeal impedance values of 0.56–0.57 mm Hg/L/s—all matching published physiological exercise data and validating the model's accuracy. By providing a controlled, repeatable testing environment, this in vitro approach enables farriers, veterinary surgeons, and researchers to evaluate novel implant materials and surgical techniques without relying on clinical trials, potentially accelerating the development of improved prosthetic laryngoplasty methods that could enhance airway function and athletic performance in affected horses. The model's flexibility also allows systematic comparison between different suture types, arytenoid angles, and implant geometries, offering a valuable research tool for advancing treatment options in this common upper airway disorder.
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Practical Takeaways
- •This in vitro model enables systematic testing and optimization of laryngoplasty implants and suture techniques before clinical application, reducing need for trial-and-error in surgery
- •The validated pressure and flow data provide objective benchmarks for evaluating whether new prosthetic designs actually improve airway function during maximal exercise conditions
- •Surgeons can use findings to understand which suture materials and abduction angles best maintain upper airway patency under the high-demand conditions horses experience at speed
Key Findings
- •In vitro model successfully reproduced inspiratory tracheal pressures of -33.0 mm Hg at 54.48 L/s flow, matching maximal exercise conditions in horses
- •Bilateral arytenoid abduction using #5 Fiberwire suture achieved translaryngeal impedance of 0.56 mm Hg/L/s under static conditions and 0.57 mm Hg/L/s under dynamic cycling
- •Dynamic flow cycling at 2 Hz produced peak inspiratory pharyngeal and tracheal pressures of -8.85 and -35.54 mm Hg respectively, mimicking in vivo exercise physiology
- •Model provides validated platform for testing novel laryngoplasty techniques without animal trials