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Metabolic Disorders of the Peripheral Nerves and Neuromuscular Junction in Animals

By

William B. Thomas

, DVM, MS, DACVIM (Neurology), University of Tennessee

Last full review/revision May 2021 | Content last modified May 2021

Diabetic Neuropathy in Dogs and Cats

Diabetic neuropathy, an uncommon complication of diabetes mellitus is seen in cats and rarely dogs. Signs include weakness, ataxia, and muscle atrophy. Affected cats often have unilateral or bilateral tibial nerve dysfunction, evident as a plantigrade stance. Several pathophysiologic mechanisms have been proposed, but prolonged hyperglycemia seems to be the important underlying factor. Pathologic findings in nerves consist of demyelination with remyelination, axonal degeneration, or both. Diagnosis is based on clinical findings, laboratory evidence of diabetes mellitus, and nerve biopsy. The prognosis is guarded, but partial or complete recovery can occur with insulin therapy.

Hypothyroid Neuropathy in Dogs

Hypothyroid neuropathy is a potential complication of hypothyroidism in dogs. Mature dogs, especially large-breed dogs, are predisposed. Several syndromes have been reported, including tetraparesis with proprioceptive deficits and hyporeflexia, vestibular dysfunction, megaesophagus, and laryngeal paralysis. In some cases, classic signs of hypothyroidism (eg, obesity and dermatopathy) are absent, and neurologic dysfunction is the only sign of illness. Pathologic findings in peripheral nerves consist of demyelination or remyelination and axonal degeneration. The pathophysiology is poorly understood, and, in some affected dogs with motor deficits, a myopathy may also be present. Diagnosis is based on clinical features, laboratory assessment of thyroid function, and response to thyroid supplementation. In some, but not all, cases, signs resolve within several months of starting thyroid replacement therapy.

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Diseases of the Peripheral Nerves and Neuromuscular Junction
Laryngeal paralysis is a common disorder of older, large-breed dogs. Denervation of the cricoarytenoideus dorsalis muscle of the larynx causes the vocal folds and arytenoid cartilages to fail to abduct during inspiration, creating an upper airway obstruction. Although the etiology is usually unknown, trauma and neoplasia can cause laryngeal paralysis. Which of the following conditions can also cause laryngeal paralysis?
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