title: Bell's palsy associated with IFN-alpha and ribavirin therapy for hepatitis C virus infection.
abstract: First-line therapy for hepatitis C virus (HCV) infection comprises interferon-alpha (IFN-alpha) and ribavirin for 6 or 12 months. Mild complications of therapy are common, but more serious complications are rare. Three patients with chronic HCV infection, acquired through injecting drug use, developed idiopathic facial paralysis (Bell's palsy) during therapy, with spontaneous resolution after withdrawal of treatment. Large-scale cohort studies reveal that IFNs are associated rarely with neurologic complications, and only one previous report has linked IFN-alpha therapy and Bell's palsy. We postulate that IFN-alpha therapy led to a breakdown of peripheral tolerance to myelin sheath antigens, leading to neuropathy, just as IFN-alpha therapy can cause autoimmune thyroiditis through breakdown of tolerance to native thyroid antigens.
authors.affiliation: Department of Hepatology, Addenbrooke's Hospital, Cambridge, CB2 2QQ, UK.
authors.forename: Matthew
authors.initials: M
authors.lastname: Hoare
authors.forename: Tracy
authors.initials: T
authors.lastname: Woodall
authors.forename: Graeme J M
authors.initials: GJ
authors.lastname: Alexander
mesh_terms: D000328:Adult; D000998:Antiviral Agents / Q000009:adverse effects*; D020330:Bell Palsy / Q000209:etiology* / Q000276:immunology; D019698:Hepatitis C, Chronic / Q000188:drug therapy* / Q000635:transmission; D006801:Humans; D007370:Interferon Type I / Q000009:adverse effects*; D008297:Male; D008875:Middle Aged; D009186:Myelin Sheath / Q000276:immunology; D011994:Recombinant Proteins; D012254:Ribavirin / Q000009:adverse effects*; D012583:Schwann Cells / Q000276:immunology; D017634:Self Tolerance / Q000187:drug effects; D015819:Substance Abuse, Intravenous / Q000150:complications
chemical_list: D000998:Antiviral Agents; D007370:Interferon Type I; D011994:Recombinant Proteins; D012254:Ribavirin