title: Vocal cord paralysis and its etiologies: a prospective study.
abstract: BACKGROUND
  Vocal cord paralysis is a common symptom of numerous diseases and it may be due to neurogenic or mechanical fixation of the cords. Paralysis of the vocal cords is just a symptom of underlying disease in some cases; so, clinical diagnosis of the underlying cause leading to paralysis of the vocal cords is important. This study evaluates the causes of vocal cord paralysis.
  
  
  METHODS
  In a prospective study, 45 patients with paralyzed vocal cord diagnosis were examined by tests such as examination of the pharynx, larynx, esophagus, thyroid, cervical, lung, and mediastinum, brain and heart by diagnostic imaging to investigate the cause vocal cord paralysis. The study was ended by diagnosing the reason of vocal cord paralysis at each stage of the examination and the clinical studies.
  
  
  RESULTS
  The mean duration of symptoms was 18.95±6.50 months. The reason for referral was phonation changes (97.8%) and aspiration (37.8%) in the subjects. There was bilateral paralysis in 6.82%, left paralysis in 56.82% and right in 63.36% of subjects. The type of vocal cord placement was midline in 52.8%, paramedian in 44.4% and lateral in 2.8% of the subjects. The causes of vocal cords paralysis were idiopathic paralysis (31.11%), tumors (31.11%), surgery (28.89%), trauma, brain problems, systemic disease and other causes (2.2%).
  
  
  CONCLUSIONS
  An integrated diagnostic and treatment program is necessary for patients with vocal cord paralysis. Possibility of malignancy should be excluded before marking idiopathic reason to vocal cord paralysis.
authors.affiliation: Department of ENT, Tabriz University of Medical Sciences, Tabriz, Iran.
authors.forename: Seyed Javad
authors.initials: SJ
authors.lastname: Seyed Toutounchi
authors.affiliation: Department of Anesthesiology, Tabriz University of Medical Sciences, Tabriz, Iran.
authors.forename: Mahmood
authors.initials: M
authors.lastname: Eydi
authors.affiliation: Cardiovascular Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.
authors.forename: Samad Ej
authors.initials: SE
authors.lastname: Golzari
authors.affiliation: Department of ENT, Tabriz University of Medical Sciences, Tabriz, Iran.
authors.forename: Mohammad Reza
authors.initials: MR
authors.lastname: Ghaffari
authors.affiliation: Department of ENT, Tabriz University of Medical Sciences, Tabriz, Iran.
authors.forename: Nashmil
authors.initials: N
authors.lastname: Parvizian
keywords: Etiology; Larynx; Paralysis; Vocal Cord
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