Neuropathies in HIV infection.

Peripheral neuropathies represent the most common neurological manifestation in patients infected with HIV infection occurring either early in the infection or during the course of the illness. They present as acute or chronic demyelinating neuropathies (Guillain-Barré syndrome or chronic inflammatory demyelinating polyneuropathy), mononeuritis multiplex, ganglioneuronitis, cytomegalovirus-related polyradiculoneuropathy, autonomic neuropathy or distal painful sensory neuropathy. They are multifactorial in aetiology. Their putative cause (viral, autoimmune, toxic, nutritional, co-infections) are often dictated by the stage of the underlying HIV disease. The virus, which is not found within ganglionic neurones or Schwann cells but only within the endoneurial macrophages, may generate a tissue-specific autoimmune attack by secretion of cytokines that promote trafficking of activated T cells and macrophages within the endoneurial parenchyma. The wide use of the neurotoxic antiretroviral nucleoside analogues ddC, ddI, d4T and 3TC, exacerbate or trigger subclinical neuropathy in many of these patients.