Facial and vestibulocochlear nerve disease in six horses.

This research article focuses on the study of disease involving the facial and vestibulocochlear nerves in six horses, with the signs of illness predominantly pointing towards an issue in these pathways. The majority of these horses showed improvements following antibiotic therapy.

Clinical Signs and Observations

• The study observed six horses which displayed clinical signs of illness that indicated a lesion – an area of damage or abnormality – involving the facial and vestibulocochlear nerves.
• These two nerves regulate facial movements and hearing/balance respectively, hence their affliction would result in distinctive symptoms in the horses such as facial paralysis, hearing loss, or imbalance.

Additional Findings

• One out of these six horses also demonstrated signs of otitis externa, an inflammation of the outer part of the ear canal, giving further credibility to the involvement of vestibulocochlear nerve in the disease.
• Radiographic examinations revealed changes primarily involving the periosteal bone proliferation (an increase in bone mass) at the point where the stylohyoid bone articulates with the temporal bone in five out of six horses, a condition that could account for some of the observed facial and auditory symptoms.

Treatment and Outcomes

• Five of these six horses showed improvement following antibiotic therapy, suggesting a bacterial infection might have been at the root of the problem triggering inflammation and damage to the facial and vestibulocochlear nerves.
• Finally, a post-mortem examination (necropsy) of one horse revealed otitis media-interna, a condition featuring inflammation of the inner ear chambers, a finding that also substantiates the involvement of these specific nerves in the disease manifestation.

Implications of the Study

• This research provides valuable insights into the diagnosis and treatment of nerve diseases in horses, particularly those involving facial and vestibulocochlear nerves.
• Furthermore, it points towards the causal relation of bacterial infections to these nerve damages and thus emphasizes on the importance of appropriate antibiotic treatment in such cases.