Clinical and pathologic findings in two draft horses with progressive muscle atrophy, neuromuscular weakness, and abnormal gait characteristic of shivers syndrome.
Two Belgian geldings, 4 and 14 years old, respectively, with muscle atrophy, weakness, and abnormal gait characteristic of severe advanced shivers were examined clinically and on necropsy. Neurologic examination revealed no evidence of ataxia, and the clinical diagnosis was neuromuscular weakness and shivers. Necropsies of both horses, including examination of pituitary, brain, spinal cord, spinal roots and ganglia, and peripheral nerves, revealed no gross or histologic abnormalities. Examination of multiple skeletal muscle specimens revealed chronic myopathic changes and periodic acid-Schiff positive, amylase-resistant inclusions within muscle fibers, characteristic of equine polysaccharide storage myopathy. It is suggested that underlying metabolic myopathy may be the cause of muscle weakness and cramping in horses with shivers.
Department of Biomedical Sciences , College of Veterinary Medicine, Cornell University, Ithaca, NY 14851, USA.
B A
BA
Valentine
A
A
de Lahunta
T J
TJ
Divers
N G
NG
Ducharme
R S
RS
Orcutt
D000821:Animal Feed; D000818:Animals; D001344:Autopsy / Q000662:veterinary; D002239:Carbohydrate Metabolism, Inborn Errors / Q000178:diet therapy / Q000473:pathology / Q000662:veterinary*; D004040:Dietary Carbohydrates / Q000008:administration & dosage; D004041:Dietary Fats / Q000008:administration & dosage; D005684:Gait; D006734:Horse Diseases / Q000178:diet therapy / Q000473:pathology*; D006736:Horses; D008297:Male; D018482:Muscle, Skeletal / Q000473:pathology; D009133:Muscular Atrophy / Q000178:diet therapy / Q000473:pathology / Q000662:veterinary*; D009468:Neuromuscular Diseases / Q000178:diet therapy / Q000473:pathology / Q000662:veterinary*; D011134:Polysaccharides / Q000378:metabolism*; D013577:Syndrome
D004040:Dietary Carbohydrates; D004041:Dietary Fats; D011134:Polysaccharides