Roaring or Laryngeal Hemiplegia is a paralysis of one of the muscles that open the throat during exertion and is the most common cause of respiratory noise during exercise. Due to this paralysis, there is reduced airflow and consequently reduced performance .

Depending on the degree (severity) of this paralysis and the horse's symptoms, various treatments are possible. In mild cases, and in the absence of reduced performance, removal of the affected vocal cord and ventricle may be sufficient (ventriculocordectomy). This is done in the standing sedated horse with a laser under endoscopic guidance.

In severe cases (complete paralysis), a tie-back surgery may be indicated (laryngoplasty). In this surgery, the paralyzed muscle is replaced with a prosthesis. This ensures that the opening to the windpipe on the paralyzed side is fixed in an open position, preventing problems during inhalation.

In the attached article, you will find additional information about this condition and the possible treatments:

Recurrent laryngeal hemiplegia