Myositis in a Feline

Myositis is a condition in which a cat's skeletal muscles are damaged by inflammation, causing them to be rigid. It is also known as MMM or Masticatory Muscle Myositis. This condition occurs as your cat's body responds to an infectious agent, parasite or virus.

  1. Causes

    • Myositis is caused by ailments that affect your cat's immune system. These ailments may include parasites such as toxoplasma, neospora or hepatozoon; infections such as ehrlichia (rickettsia); and syndromes such as Parneoplastic. Myositis may also be the result of a hyperactive immune system.

    Symptoms

    • Symptoms of myositis include stiff movement, muscle swelling or shrinkage, muscle pain, weakness, tiring easily, vomiting and difficulty swallowing.

    Diagnosis

    • Myositis can be diagnosed through comprehensive blood work, biochemical profiling, urinanalysis, muscle biopsies and X-rays. A cat suffering from myositis will have elevated levels of the muscle enzyme creatine kinase; positive serum antinuclear antibodies, which suggest an immune disease; and the presence of infectious organisms.

    Treatment

    • Most cats suffering from myositis need to be treated at their vets office on a regular basis. The treatment may include fluid and electrolyte therapy, nutritional support and immunosuppressive drugs.

    Home Care

    • Owners with cats suffering from myositis should be careful to give all medication and to manage their cat’s diet as directed by their veterinarian. If you notice a change in your cat’s condition, especially coughing or difficulty breathing, contact your veterinarian.