Effect of age and prostheses location on rima glottidis area in equine cadaveric larynges.
Authors: Bischofberger Andrea S, Hadidane Ines, Wereszka Marta M, Perkins Nigel R, Jeffcott Leo B, Dart Andrew J
Journal: Veterinary surgery : VS
Summary
# Editorial Summary Laryngeal hemiplegia remains a challenging condition in equine practice, and surgical outcomes depend partly on understanding how prosthesis positioning affects airway patency. Researchers examined 40 cadaveric equine larynges across three age groups (≤5 years, >5–10 years, and >10 years) to determine whether age influences the rima glottidis area when different prosthesis locations are loaded progressively from 0 to 35 N. Three prosthesis configurations were tested: cranial placement through the dorsal cricoid spine, dorsal placement through the caudal cricoid rim, and lateral placement 1.5 cm from the dorsal midline, with rima glottidis area measured at 5 N increments using a tensiometer. Age exerted no significant effect on airway opening across any prosthesis location or load, suggesting that age-related changes in laryngeal cartilage or soft tissue properties do not materially alter the biomechanics of prosthetic laryngoplasty within the age ranges tested. For practitioners, this indicates that surgical technique and prosthesis positioning, rather than patient age, should be the primary considerations when planning tie-back surgery, and that outcome variability is more likely attributable to anatomical variation or surgical factors than to age-related degeneration of the laryngeal framework.
Read the full abstract on PubMed
Practical Takeaways
- •Laryngeal prosthesis effectiveness for treating RLN is not compromised by patient age, allowing treatment consideration across all age groups
- •Prosthesis location choice can be based on surgical accessibility and anatomical factors rather than age-related concerns about tissue response
- •Standardized tensioning protocols enable consistent prosthesis placement and predictable airway outcomes regardless of horse age
Key Findings
- •Age had no significant effect on rima glottidis area across any prosthesis location when loads ranged from 5-35 N
- •Three prosthesis locations (cranial, dorsal, lateral) were tested on cadaveric larynges grouped by age (≤5 years, >5-10 years, >10 years)
- •Rima glottidis area could be measured systematically using progressive suture tensioning with a tensiometer