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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).
The causes of polyneuropathy can be divided into hereditary and acquired and are therefore as follows: [2] Inherited – hereditary motor neuropathies, Charcot–Marie–Tooth disease, and hereditary neuropathy with liability to pressure palsy; Acquired – diabetes mellitus, vascular neuropathy, alcohol use disorder, and vitamin B12 deficiency
Acute motor axonal neuropathy (AMAN) is a variant of Guillain–Barré syndrome. It is characterized by acute paralysis and loss of reflexes without sensory loss. Pathologically , there is motor axonal degeneration with antibody-mediated attacks of motor nerves and nodes of Ranvier .
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]
Sural nerve biopsy; biopsy is considered for those patients in whom the diagnosis is not completely clear, when other causes of neuropathy (e.g., hereditary, vasculitic) cannot be excluded, or when profound axonal involvement is observed on EMG. Ultrasound of the peripheral nerves may show swelling of the affected nerves. [32] [33] [34]
Peripheral neuropathy and mononeuropathy are common neurological disorders, with a diverse range of variables and causes to conclude a diagnosis. [2] Neuropathy has three sub-classifications; mononeuropathy is a result of an entrapped or traumatised nerve or nerve area, Mononeuropathy multiplex is linked to chronic diseases like leprosy, and ...
The amount of pressure required to cause nerve dysfunction starts at around 20mmHg where epineural venus blood flow is reduced. [3] At 30mmHg anterograde and retrograde axonal transport is impaired. [3] Between 30-50mmHg there will usually be changes in intraneural blood flow, axonal transport, and vascular permeability simultaneously. [4]
Hypertrophic condition causes neural stiffness and a demyelination of nerves in the peripheral nervous system, and atrophy causes the breakdown of axons and neural cell bodies. [1] In these disorders, a patient experiences progressive muscle atrophy and sensory neuropathy of the extremities. [2]
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