Pathophysiological correlations in neuropathies

This chapter begins with an explanation of the pathophysiological correlations between the recorded changes and the underlying diagnosis which allow classification into demyelinating and axonal neuropathy. Demyelinating neuropathies are discussed first. The extensive and ever expanding literature in hereditary neuropathies is highlighted. The different variants of the acute inflammatory demyelinating polyneuropathy encountered in children are discussed along with the electrodiagnostic criteria for the diagnosis. Chronic inflammatory demyelinating polyneuropathy is then covered, both in its clinical presentation and electrodiagnosis. Other causes such as MNGIE and Lyme disease are highlighted. In the section on axonal neuropathy, division into hereditary and acquired is made. The diagnosis of sensorimotor hereditary neuropathies is discussed along with primarily sensory neuropathies including ataxia telangiectasia, Friedreich’s ataxia, and abetalipoproteinaemia, finishing with discussion of the hereditary sensory and autonomic neuropathies. The many different causes of acquired axonal neuropathy are listed and discussed including neoplasia, endocrine disturbances, metabolic conditions, infective agents, autoimmune conditions, mitochondrial disease, drugs, and vitamin deficiency, finishing with critical illness neuromyopathy.