Effects of unilateral laser-assisted ventriculocordectomy in horses with laryngeal hemiplegia.

This research investigates the effects of a minimally invasive surgical procedure, unilateral laser-assisted ventriculocordectomy (LVC), on horses suffering from laryngeal hemiplegia (LH), a recurrent laryngeal neuropathy. The study found that LVC improved upper airway function and reduced the noise during inhalation in exercising horses, suggesting it could be recommended as a treatment for LH.

Objective and Methodology

• The study’s goal was to determine if unilateral laser-assisted ventriculocordectomy (LVC) could enhance upper airway function and lessen the noise produced during inhalation in horses impacted by laryngeal hemiplegia (LH).

• Six Standardbred horses were used in the experiment, which measured respiratory sound and inspiratory transupper airway pressure (Pui) before and after LH induction, and 60, 90, and 120 days post-LVC.

• The group also utilized computer-based sound analysis programs to measure inspiratory sound level (SL) and the sound intensities of formants 1, 2, and 3 (Fl, F2, and F3).

Results

• After inducing LH in horses, Pui, SL, and the sound intensity of F2 and F3 increased significantly compared to baseline values.

• 60 days post-LVC, Pui and SL returned to baseline levels, and F2 and F3 values showed partial improvement in contrast to LH values.

• However, upon reaching the 90 and 120-day marks, SL levels rose back to LH levels.

Conclusions

• According to the findings, LVC effectively decreases LH-associated airway obstruction within 60 days post-surgery and decreases inspiratory noise but not as effectively as bilateral ventriculocordectomy (a more invasive procedure).

• For laryngeal hemiplegia treatment where reducing upper airway obstruction and respiratory noise is desired, and the horse owner wants to avoid risks associated with laryngotomy incision or general anesthesia, LVC may be recommended.