Inclusion Criteria:  Diagnosis of possible, probable, or definite CIDP (typical or atypical) according to European Federation of Neurological Societies (EFNS) guidelines Disease duration of 3 years or less Age 18 years or above Previous treatment with methyl-prednisolone and insufficient therapeutic response as judged by the treating physician, or contraindications against methyl-prednisolone, or clinically significant side effects under methyl-prednisolone therapy as judged by the treating physician  Exclusion Criteria:  Clinical or laboratory evidence of manifest systemic infection, i.e., C-reactive protein (CRP) above 20 mg/l, or evidence of nitrite-positive urinary tract infection Intake of angiotensin converting enzyme inhibitor within 1 week before first treatment immunoglobulin A deficiency Other contraindications against immunoadsorption or intravenous immunoglobulins