title: Classifications and treatment responses in chronic immune-mediated demyelinating polyneuropathy.
abstract: BACKGROUND
  Chronic immune-mediated demyelinating polyneuropathy (CIP) represents a heterogeneous pool of motor, sensory, sensorimotor, symmetric, or asymmetric syndromes.
  
  
  OBJECTIVE
  To evaluate published diagnostic classifications and characterize predictors of treatment response.
  
  
  METHODS
  One hundred two of 158 patients with a working diagnosis of CIP were included and clinically characterized because they had electrophysiologic and/or histologic evidence of demyelination. The biostatistical profile of patients with symmetric clinical manifestation was analyzed using three proposed classifications (American Academy of Neurology [AAN] criteria, modified AAN criteria, European Federation of Neurological Societies/Peripheral Nerve Society [EFNS/PNS] criteria). Treatment responses to IV immunoglobulins (IVIg) and their positive predictors were investigated.
  
  
  RESULTS
  Sensitivities (0.52 [AAN] vs 0.83 [modified AAN] vs 0.95 [EFNS/PNS]) and negative predictive values (0.68 vs 0.85 vs 0.92) differed markedly, whereas specificities (0.94 vs 0.90 vs 0.96) and positive predictive values (0.89 vs 0.89 vs 0.97) were similar. In CIP patients treated with IVIg, a positive response was found in 62 of 76 (82%). Patients with a monophasic or relapsing-remitting course or a more than twofold CSF protein increase had the highest probability to respond to IVIg, most evident when using the modified AAN criteria.
  
  
  CONCLUSIONS
  The European Federation of Neurological Societies/Peripheral Nerve Society criteria for chronic inflammatory demyelinating polyneuropathy improve treatment of patients with chronic immune-mediated demyelinating polyneuropathy, particularly with respect to diagnostic issues. To predict IV immunoglobulin treatment response, the modified American Academy of Neurology criteria are the most valuable classification provided an increased CSF protein level.
authors.affiliation: Philipps-University, Department of Neurology, Clinical Neuroimmunology Group, Marburg, Germany.
authors.forename: B
authors.initials: B
authors.lastname: Tackenberg
authors.forename: J D
authors.initials: JD
authors.lastname: Lünemann
authors.forename: A
authors.initials: A
authors.lastname: Steinbrecher
authors.forename: E
authors.initials: E
authors.lastname: Rothenfusser-Korber
authors.forename: M
authors.initials: M
authors.lastname: Sailer
authors.forename: W
authors.initials: W
authors.lastname: Brück
authors.forename: S
authors.initials: S
authors.lastname: Schock
authors.forename: R
authors.initials: R
authors.lastname: Zschenderlein
authors.forename: F
authors.initials: F
authors.lastname: Zipp
authors.forename: N
authors.initials: N
authors.lastname: Sommer
mesh_terms: D000328:Adult; D000368:Aged; D015415:Biomarkers / Q000032:analysis; D002556:Cerebrospinal Fluid Proteins / Q000032:analysis / Q000276:immunology; D002908:Chronic Disease; D003937:Diagnosis, Differential; D018450:Disease Progression; D004351:Drug Resistance / Q000276:immunology; D005260:Female; D006801:Humans; D016756:Immunoglobulins, Intravenous / Q000627:therapeutic use*; D008297:Male; D008875:Middle Aged; D011115:Polyneuropathies / Q000145:classification* / Q000175:diagnosis / Q000628:therapy*; D011129:Polyradiculoneuropathy / Q000145:classification* / Q000175:diagnosis / Q000628:therapy*; D017410:Practice Guidelines as Topic; D011237:Predictive Value of Tests; D011379:Prognosis; D012008:Recurrence; D012955:Societies, Medical; D016896:Treatment Outcome
chemical_list: D015415:Biomarkers; D002556:Cerebrospinal Fluid Proteins; D016756:Immunoglobulins, Intravenous