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  • Title: Myasthenia gravis.
    Author: Palmer AC.
    Journal: Vet Clin North Am Small Anim Pract; 1980 Feb; 10(1):213-21. PubMed ID: 6996286.
    Abstract:
    Myasthenia gravis is characterized by muscle weakness, which is alleviated by rest and by anticholinesterase drugs. There are two forms of the disease in the dog, acquired and congenital. The acquired form occurs either in young adults, or in older animals that have developed mediastinal tumors. Clinically, there is weakness of the muscles of the limbs, neck, and head, together with dilatation of the esophagus. In some cases, circulating antibody to acetylcholine receptor is present and the amount of receptor in the end-plates is decreased. It is thought to be an autoimmune disease. The congenital form of canine myasthenia gravis occurs most frequently in Jack Russell terriers from six to eight weeks of age. The clinical manifestations are similar to those accompanying acquired myasthenia, although dilatation of the esophagus is not a feature. Raised antibody levels to acetylcholine receptor have not been noted, although the amount of receptor in the end-plates is decreased. Thus, the congenital form does not appear to be an autoimmune disease and the pathophysiology has yet to be established. Both forms of canine myasthenia gravis provide useful models analogous to the disease in man.
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