The effect of the laryngeal tie-forward procedure and soft palate cautery on nasopharyngeal diameter in horses.
Authors: Offord S, Tulloch L K, Franklin S H, Tremaine W H, Woodford N S, Allen K J
Journal: The Veterinary record
Summary
# Editorial Summary: Laryngeal Tie-Forward and Nasopharyngeal Airway Diameter Dorsal displacement of the soft palate (DDSP) remains a common cause of poor performance in racehorses, with laryngeal tie-forward (LTF) procedures frequently employed as surgical correction. Offord and colleagues examined 25 thoroughbreds undergoing LTF with or without soft palate cautery, using lateral radiographs taken before and after surgery to measure changes in laryngeal position and nasopharyngeal diameter. Both procedures produced a substantial 14–17 per cent reduction in dorsoventral nasopharyngeal diameter (P<0.001), confirming the hypothesis that LTF mechanically narrows this critical airway space through repositioning of the hyoid apparatus. Whilst LTF successfully stabilises the soft palate and improves performance in many horses, this reduction in nasopharyngeal diameter warrants careful consideration: the long-term impact on upper airway function during intense exercise—particularly whether this narrowing compromises airflow sufficiently to cause clinical problems—remains unresolved and merits further investigation. Practitioners should factor this anatomical consequence into surgical decision-making, particularly for horses with concurrent upper airway compromise or those with marginal respiratory reserves.
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Practical Takeaways
- •Surgeons should be aware that LTF procedures significantly reduce nasopharyngeal airway diameter, which may have functional implications during strenuous exercise despite treating soft palate displacement
- •Further research is needed to determine whether the nasopharyngeal diameter reduction negatively impacts athletic performance or breathing capacity in treated horses
- •Consider nasopharyngeal diameter reduction as a potential trade-off when selecting LTF as a treatment option for dorsal displacement of the soft palate
Key Findings
- •Laryngeal tie-forward procedure with or without soft palate cautery resulted in significant 14-17% reduction in dorsoventral nasopharyngeal diameter (P<0.001)
- •The LTF procedure moves the larynx rostrally and dorsally while repositioning the basihyoid bone caudally and dorsally
- •The effect of reduced nasopharyngeal diameter on upper respiratory tract function during exercise remains unclear