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Peripheral neuropathy may be classified according to the number and distribution of nerves affected (mononeuropathy, mononeuritis multiplex, or polyneuropathy), the type of nerve fiber predominantly affected (motor, sensory, autonomic), or the process affecting the nerves; e.g., inflammation (), compression (compression neuropathy), chemotherapy (chemotherapy-induced peripheral neuropathy).
However, neuropathies may be due to either inflammatory [6] or non-inflammatory causes, [7] and the term encompasses any form of damage, degeneration, or dysfunction, while neuritis refers specifically to the inflammatory process. As inflammation is a common reaction to biological insult, many conditions may present with features of neuritis.
The most common cause is acute inflammatory demyelinating polyneuropathy AIDP, the most common form of Guillain–Barré syndrome [13] (although other causes include chronic inflammatory demyelinating polyneuropathy) [14] Neuronopathy is the result of issues in the peripheral nervous system (PNS) neurons.
It has been suggested that multifocal motor neuropathy is distinct from chronic inflammatory demyelinating polyneuropathy and that Lewis-Sumner syndrome is a distinct variant type of chronic inflammatory demyelinating polyneuropathy. [53] The Lewis-Sumner form of this condition is considered a rare disease with only 50 cases reported up to 2004 ...
The causes of nerve damage are grouped into categories including those due to paraneoplastic causes (neuropathy secondary to cancer), immune mediated, infectious, inherited or degenerative causes and those due to toxin exposure. In idiopathic sensory neuronopathy no cause is identified. Idiopathic causes account for about 50% of cases. [2]
During neuropathic pain, ectopic activity arises in the peripheral nociceptors and this appears to be due in part to changes in the ion channel expression at the level of the periphery. There may be an increase in the expression or activity of voltage gated sodium and calcium channels which will support action potential generation.
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