Permanent tracheostomy in Equidae: 47 cases (1981-1986).

The research article discusses a study conducted on 46 ponies and 1 Quarter Horse where they underwent permanent tracheostomy between 1981 and 1986, aiming to evaluate the effects of this procedure on the animals in terms of functionality and complications.

Procedure and Findings

• The study consisted of performing permanent tracheostomy operations on 46 ponies and a Quarter Horse. The operations were then reviewed six years later, in 1986.
• The review involved evaluating the vertical length of the stomal orifice of the tracheostomies (the opening through which the animals breathed), degree of tracheal obstruction, the regrowth and apposition of epidermis, and the occurrence of stomatal airflow with nasal occlusion.
• The mean stomal orifice length was observed to be 25.0 mm with a standard deviation of +/- 4.7 mm in the ponies, and 55 mm in the horse. There were no instances of tracheal obstruction. Among the 20 animals, three showed signs of having their epidermis regrow and join together, and all 20 showed signs of stomal airflow when their nostrils were blocked.

Further Evaluation

• The study also involved checking if the animals developed dyspnea (difficulty in breathing) during exercise. Regarding this, the records of 27 ponies were analyzed.
• Out of 27 ponies, six were found not to be dyspneic upon their last routine checkup. A total of 21 ponies had either died or been euthanized.
• However, among the deaths, only five were associated with complications from the respiratory tract. These included three ponies with collapsing tracheas and two ponies suffering from Chronic Obstructive Pulmonary Disease (COPD).

Conclusions

• The findings from the reviews and evaluations highlighted the effectiveness of the permanent tracheostomy technique as it provided a functional and aesthetic airway for the animals.
• The study also found a low rate of complications associated with the procedure, suggesting its safety and viability for ponies and horses suffering from respiratory issues. However, the small number of animals considered does limit the reach of these conclusions.