Temporary bilateral laryngeal paralysis in a horse associated with general anaesthesia and post anaesthetic myositis.

The paper discusses a case where a Highland pony developed temporary bilateral laryngeal paralysis following general anaesthesia for a sinus surgery, which was followed by myositis. The pony’s respiratory conditions and muscular inflammation were treated and eventually resolved, with the pony regaining its laryngeal function after a year.

Study Context

• The research is centred on a case involving an eight-year-old Highland pony that needed surgical treatment for a mandibular sinus issue.
• Prior to the surgery, the pony displayed normal laryngeal function. However, complications arose postoperatively, mainly in the form of respiratory distress and myositis.

Post-Anaesthesia Complications

• Following recovery from anaesthesia, the pony demonstrated severe respiratory distress and stridor. These were symptoms of total bilateral laryngeal paralysis and pulmonary oedema, meaning that both sides of the pony’s larynx ceased functioning and its lungs filled with fluid.
• Due to the critical nature of the situation, the pony was swiftly given a temporary tracheostomy. This surgical procedure involves making an incision on the front of the neck and opening a direct airway through an incision in the trachea (windpipe).

Postoperative Myositis

• Several hours following the surgery, the pony developed postoperative myositis, an inflammation of the muscles.
• This condition, although painful, managed to resolve itself within two days, showing the resiliency of the pony’s body to recover rapidly from a distressing situation.

Recovery Timeline

• The recovery process for the pony extended over the span of a year. By the end of this period, the pony’s laryngeal function had returned to normal.
• This case indicates the long-term effects that can occur from anesthesia-associated complications and the considerable time it may take for full recovery to be achieved.