Equine Myositis and Myopathy Study Guide
Overview and Clinical Importance
Equine myopathies and myositis represent a diverse group of muscle disorders that are frequently encountered in equine practice and constitute a significant portion of NAVLE examination content. These conditions range from acute exertional rhabdomyolysis ("tying up") to inherited metabolic disorders and toxic myopathies. Understanding the pathophysiology, clinical presentation, diagnosis, and management of these conditions is essential for veterinary practice.
The term rhabdomyolysis refers to the breakdown of skeletal muscle fibers with release of intracellular contents (myoglobin, creatine kinase, electrolytes) into the bloodstream. This can occur sporadically or as a chronic, recurrent condition with underlying genetic predisposition.
Classification of Equine Myopathies
Equine myopathies can be classified based on etiology and presentation:
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