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Vet Pathol 37:193-196 (2000)
© 2000 American College of Veterinary Pathologists
BRIEF COMMUNICATIONS AND CASE REPORTS

Polysaccharide Storage Myopathy in Morgan, Arabian, and Standardbred Related Horses and Welsh-cross Ponies

B. A. Valentine, S. P. McDonough, Y.-F. Chang and A. J. Vonderchek

Abstract

Polysaccharide storage myopathy is an equine neuromuscular disorder characterized by accumulation of glycogen-related polysaccharide inclusions within skeletal muscle fibers. The pathologic criteria for diagnosis of this disorder are somewhat controversial; however, periodic acid–Schiff-positive, amylase-resistant inclusions are considered pathognomonic. Although these inclusions are most often found in affected horses related to the Quarter Horse, draft horse, and Warmblood breeds, this report describes these characteristic inclusions in muscle of five horses from nonrelated breeds (two Morgans, one Arabian, one Arabian x Thoroughbred, and one Standardbred) and two Welsh cross ponies. Affected horses had histories of recurrent exertional rhabdomyolysis, and one developed progressive weakness leading to increased recumbency. The affected ponies were part of an unrelated research project and had no apparent clinical signs.

Key words: Glycogen; glycogen storage; horses; myopathy; polysaccharide.

Request reprints from Dr. B. A. Valentine, Department of Biomedical Sciences, College of Veterinary Medicine, Oregon State University, Magruder Hall 142, Corvallis, OR 97331 (USA). E-mail: beth.valentine{at}orst.edu.




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