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Incidence of polysaccharide storage myopathy: necropsy study of 225 horses.
|Title||Incidence of polysaccharide storage myopathy: necropsy study of 225 horses.|
|Publication Type||Journal Article|
|Year of Publication||2005|
|Authors||Valentine BA, Cooper BJ|
|Date Published||2005 Nov|
|Keywords||Animals, Carbohydrate Metabolism, Inborn Errors, Female, Glycogen, Horse Diseases, Horses, Incidence, Male, Muscle, Skeletal, Muscular Diseases, Species Specificity|
Muscle samples were obtained at necropsy from 225 horses and ponies 1 year of age or older. Samples were processed in routine manner and were stained with hematoxylin and eosin and with periodic acid-Schiff for glycogen. Sections were examined for abnormal glycogen content and amylase-resistant complex polysaccharide and for chronic myopathic change (excessive fiber size variation, increase in number of internal nuclei). A total of 101 horses and ponies with lesions of polysaccharide storage myopathy were identified. Age of affected horses ranged from one to 30 years, with a mean of 14.7 years. Mean age of nonaffected horses was 12 years. Incidence of polysaccharide storage myopathy varied depending on breed; Thoroughbreds had the lowest (27%) and draft-related horses had the highest (86%) incidence. Chronic myopathic changes were more severe in polysaccharide storage myopathy-affected horses than in nonaffected horses. Results of this study indicate that polysaccharide storage myopathy is a common disorder of many breeds of horses and ponies.
|Alternate Journal||Vet. Pathol.|