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Incidence of Polysaccharide Storage Myopathy: Necropsy Study of 225 Horses

Abstract

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.

Key words: Horses; muscular disorders; myopathy; polysaccharide.

Dr. B. A. Valentine, Department of Biomedical Sciences, College of Veterinary Medicine, Magruder 142, Oregon State University, Corvallis, OR 97331 (USA). E-mail: Beth.Valentine{at}oregonstate.edu

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