title: Cranial optic nerve involvements in patients with severe COPD.
abstract: OBJECTIVE
  The relationship between neuropathy and increased morbidity in patients with COPD is clear, but few studies have assessed cranial neuropathies, especially optic nerve involvement, in COPD patients. We evaluated peripheral involvement of the optic nerve and determined factors influencing this condition in patients with severe COPD.
  
  
  METHODS
  Twenty-eight patients, mean age 59.4 +/- 9.4 years, diagnosed with severe stable COPD according to the GOLD criteria, and 20 age- and gender-matched healthy individuals, mean age 55.6 +/- 8.5 years, were included in the study. All subjects underwent visual evoked potential (VEP) assessment together with detailed clinical and laboratory examination to exclude concurrent risk factors for neuropathy.
  
  
  RESULTS
  VEP assessment showed significant abnormalities in COPD patients (82.1%) (commonly amplitude abnormalities) when compared with healthy controls.
  
  
  CONCLUSIONS
  The optic nerve is often involved in patients with severe COPD, possibly as part of a polyneuropathy, and this is related to acidosis, hypercarbia and airway obstruction, independent of disease duration, smoking and age. These results should be taken into consideration when determining management strategies for these patients.
authors.affiliation: Department of Chest Disease, Mersin University School of Medicine, Turkey. cengizozge@mersin.edu.tr
authors.forename: Cengiz
authors.initials: C
authors.lastname: Ozge
authors.forename: Aynur
authors.initials: A
authors.lastname: Ozge
authors.forename: Ayça
authors.initials: A
authors.lastname: Yilmaz
authors.forename: Deniz E
authors.initials: DE
authors.lastname: Yalçinkaya
authors.forename: Mukadder
authors.initials: M
authors.lastname: Calikoğlu
mesh_terms: D016022:Case-Control Studies; D003430:Cross-Sectional Studies; D005074:Evoked Potentials, Visual; D005260:Female; D006801:Humans; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D018917:Optic Neuropathy, Ischemic / Q000175:diagnosis / Q000209:etiology* / Q000503:physiopathology; D029424:Pulmonary Disease, Chronic Obstructive / Q000150:complications*; D012307:Risk Factors