Unilateral laser ventriculocordectomy results in increased arytenoid stability in horses with severe left sided recurrent laryngeal neuropathy.

This research investigates the impact of a medical procedure known as unilateral laser ventriculocordectomy (VeC) on horses with severe recurrent laryngeal neuropathy (RLN). The study found out that the procedure results in a minor decrease in left arytenoid abduction but notably increases the stability of the arytenoid.

Explanation of the Research

The research is a prospective cohort study involving eight horses which had Grade C or D exercising laryngeal function linked to RLN. These horses were all treated using unilateral laser VeC.

• The investigation involved measuring, before and after the aforementioned treatment, the stability and abduction (movement away from the center) of the arytenoids. Arytenoid cartilages play a vital role in opening and closing the vocal cords and larynx.
• To measure arytenoid stability at peak exercise, the left-to-right quotient angle ratio (LRQ) of the corniculate processes was calculated. This was done at the points of both maximal arytenoid abduction and maximal arytenoid collapse.
• The statistics were then analyzed, using an average of measurements taken for four breaths, both before and after the ventriculocordectomy.

Results of the Study

The findings showed that the surgery, unilateral laser VeC, resulted in a greater stability of the left arytenoid, with a smaller difference in LRQ between inspiration and expiration post-operation compared to pre-operation.

• The study showed improvements in arytenoid stability for all the horses, but those with Grade D issues experienced the most significant improvements.
• The results also found that the left arytenoid was less abducted (moved less from the centre) following the operation.

Limitations and Conclusions

The study did have some limitations, including a small sample size and the absence of racehorses. Additionally, the assessment after surgery was carried out at different times for different subjects.

Regardless of the limitations, it was concluded that unilateral laser VeC led to enhanced arytenoid stability, albeit with a slight reduction in left arytenoid abduction, in horses affected by Grade C and D RLN.