Optimal tension, position, and number of prostheses required for maximum rima glottidis area after laryngoplasty.
Authors: Bischofberger Andrea S, Wereszka Marta M, Hadidane Ines, Perkins Nigel R, Jeffcott Leo B, Dart Andrew J
Journal: Veterinary surgery : VS
Summary
# Editorial Summary Laryngeal hemiplegia remains one of the most common upper airway obstructions in racehorses, and whilst prosthetic laryngoplasty is a well-established surgical technique, the optimal configuration of implants has never been systematically evaluated. Bischofberger and colleagues used 22 cadaveric equine larynges to investigate how suture tension, prosthesis position, and the number of implants affect the rima glottidis area—the critical opening through which air passes during exercise. They progressively loaded individual prostheses from 0 to 35 Newtons in 5 N increments and separately tested combinations of two or three prostheses at a standardised 15 N tension, measuring cross-sectional airway area at each increment. Maximum rima glottidis area was achieved at 20 N of suture tension for each individual prosthesis, but the crucial finding was that using two or three prostheses together at 15 N produced larger combined airway areas than any single implant, regardless of anatomical placement. These results have direct clinical implications: practitioners can confidently place multiple prostheses at moderate tension without fear of over-tightening, and combination approaches may offer superior functional outcomes compared to single-implant techniques—potentially translating to improved performance and reduced post-operative complications in horses undergoing laryngoplasty.
Read the full abstract on PubMed
Practical Takeaways
- •Consider using 2-3 laryngeal prostheses rather than a single prosthesis to maximize airway opening in horses undergoing laryngoplasty for paralysis.
- •Maintain suture tension around 15 N during laryngoplasty procedures to achieve optimal rima glottidis area without excessive tension.
- •Prosthesis placement location is less critical than the number used and tension applied—focus on achieving proper load rather than precise anatomic positioning.
Key Findings
- •Rima glottidis area increased progressively with prosthesis load, reaching maximum at 20 N for each individual prosthesis.
- •Two or three prostheses tied in combination at 15 N load achieved significantly larger rima glottidis area than single prostheses.
- •Optimal rima glottidis cross-sectional area was achieved with 2-3 prostheses at 15 N tension regardless of anatomic prosthesis location.