Abstract
Chronic inflammatory demyelinating polyneuropathy (CIDP) is a rare disabling disease with an incompletely understood autoimmune etiology. Differentiating the condition from other neurological diseases can be challenging and appropriate treatment is often delayed. Intravenous immunoglobulin (IVIg), plasmapheresis, corticosteroids and subcutaneous immunoglobulin (SCIg) have all been demonstrated to be beneficial in placebo-controlled, randomized clinical trials. Corticosteroids, including methylprednisolone and dexamethasone are effective and frequently used in CIDP but their long-term use is limited by side effects. One of the most commonly prescribed treatments for CIDP is IVIg which diminishes inflammatory processes and prevents disease progression. Treatment with IVIg has proven effective in randomized, double blind, placebo controlled, clinical trials and the results support its use in CIDP. For some patients, the benefit of IVIg, is limited by the frequency of infusions and systemic side effects such as flu-like symptoms, headache, and nausea. Other effective treatments for CIDP include corticosteroids that are associated with serious side effects in long-term use and plasmapheresis which requires specialized facilities. More recently, SCIg has been demonstrated in double blind, placebo-controlled studies to be effective for maintenance use in CIDP in patients whose disease has been controlled by IVIg. In a large clinical trial, 0.2 g/kg and 0.4 g/kg body weight doses of 20% SCIg equivalent to 1 mL/kg or 2 mL/kg, respectively, administered weekly, demonstrated efficacy in CIDP and were well tolerated. Immunomodulating treatments such as cyclophosphamide, mycophenolate mofetil and rituximab have also shown efficacy in select populations with CIDP.
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