Chronic Inflammatory Demyelinating Polyneuropathy (CIDP) (Chronic Acquired Demyelinating Polyneuropathy; Chronic Relapsing Polyneuropathy) By Michael Rubin, MDCM, New York Presbyterian Hospital-Cornell Medical Center Reviewed / Revised Apr 2022 | Modified Sep 2022 View Patient Education Symptoms and Signs Diagnosis Treatment Key Points Chronic inflammatory demyelinating polyneuropathy is an immune-mediated polyneuropathy characterized by symmetric weakness of proximal and distal muscles and by progression continuing > 2 months.