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Exercise intolerance and collapse
- Authors: Simon Platt and G. Diane Shelton
- From: BSAVA Manual of Canine and Feline Neurology
- Item: Chapter 18, pp 342 - 367
- DOI: 10.22233/9781910443125.18
- Copyright: © 2013 British Small Animal Veterinary Association
- Publication Date: January 2013
Abstract
Exercise intolerance, which may also be considered as activity-related weakness, occurs with walking or running and dissipates with rest. It is recognized as early fatigue with mild activity, although in some cases more vigorous or prolonged exercise may be needed to induce the problem. It may be associated with episodic muscle cramps. This chapter covers clinical signs, lesion localization, pathophysiology, differential diagnosis, neurodiagnostic investigation, peripheral neuropathies, disorders of neuromuscular transmission, myopathies.
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Supplements
Exercise-induced collapse
A Labrador Retriever with exercise-induced collapse (a) 5 minutes post-exercise
Exercise-induced collapse
(b) 10 minutes post-exercise. (Courtesy of Dr S Taylor) (See page 365 in the Manual)
Exercise intolerance
(a) Labrador Retriever with exercise intolerance due to myasthenia gravis.
Exercise intolerance
(b) A Boxer showing exercise intolerance progressing to a rigid and weak stance due to polymyositis. (See page 342 in the Manual)
Gracilis muscle myopathy
A German Shepherd Dog showing the typical gait seen with gracilis myopathy. Right rear leg. Note the shortened stride and inward rotation of leg from the hock down. (Courtesy of Dr D Lewis) (See page 366 in the Manual)
Inherited myopathy
Inherited myopathy affecting a 7-month-old Great Dane bitch, causing exercise intolerance. (Courtesy of Dr S Long and Dr J Anderson) (See page 358 in the Manual)
Muscular dystrophy
(a) A 6-month-old Springer Spaniel exhibiting the typical gait seen in muscular dystrophy associated with increased tone and decreased flexor ability in all limbs. (Courtesy of Dr E MacKillop)
Muscular dystrophy
(b) Old English Sheepdog puppy with end-stage muscular dystrophy. (See page 356 in the Manual)
Myasthenia gravis
(a) A young Border Terrier with myasthenia gravis demonstrating a profound inability to ambulate after a short burst of activity.
Myasthenia gravis
(b) The same dog, pre- and post-administration of edrophonium, which is a subjective test for myasthenia gravis. A positive response is seen following the administration of the drug. (See page 349 in the Manual)
Neuromuscular disease
A Rottweiler with diffuse neuromuscular disease, which is now so severe that there is respiratory compromise with abdominal breathing. (See page 342 in the Manual)
Steroid myopathy
A 13-year-old Dachshund demonstrating tremendous stiffness in all limbs with profound muscular atrophy. The dog had been treated with oral steroids for 3 years and had developed steroid myopathy as a consequence. (See page 353 in the Manual)