title: Effectiveness of the computed analysis of electroglottographic signals in muscle tension dysphonia.
abstract: OBJECTIVE
  To investigate the usefulness of electroglottography (EGG) parameters in the diagnosis and estimation of efficacy of voice therapy for muscle tension dysphonia (MTD).
  
  
  METHODS
  Nineteen MTD participants, an equivalent number of dysphonic ('organic') patients with vocal fold lesions and as many normal speakers were enrolled. Acoustic (Ac) and EGG signals during sustained phonation were recorded simultaneously. The period and amplitude perturbation quotient of both signals, the closed quotient (CQ) of EGG signals (mean CQ) and its standard deviation (CQSD) were calculated, and subsequently compared among the three groups. These parameters in the MTD group were compared before and after voice therapy.
  
  
  RESULTS
  The perturbation measures of both signals in the MTD group were either as high as or significantly higher than those in the organic group or the control group, respectively. Both the Ac and EGG parameters after therapy significantly decreased. The CQSD, but not mean CQ, also decreased after therapy.
  
  
  CONCLUSIONS
  EGG parameters related to the regularity of vocal fold vibration, but not to the degree of vocal fold contact (mean CQ), are useful for the diagnosis and estimation of voice therapy outcome in MTD.
authors.affiliation: Department of Otorhinolaryngology, Head and Neck Surgery, Osaka University Graduate School of Medicine, Toyonaka-Heisei Hospital, Osaka, Japan. khosokawa@ent.med.osaka-u.ac.jp
authors.forename: K
authors.initials: K
authors.lastname: Hosokawa
authors.forename: M
authors.initials: M
authors.lastname: Yoshida
authors.forename: T
authors.initials: T
authors.lastname: Yoshii
authors.forename: Y
authors.initials: Y
authors.lastname: Takenaka
authors.forename: M
authors.initials: M
authors.lastname: Hashimoto
authors.forename: M
authors.initials: M
authors.lastname: Ogawa
authors.forename: H
authors.initials: H
authors.lastname: Inohara
mesh_terms: D000328:Adult; D000368:Aged; D055154:Dysphonia / Q000175:diagnosis* / Q000503:physiopathology* / Q000628:therapy; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009129:Muscle Tonus / Q000502:physiology*; D012815:Signal Processing, Computer-Assisted; D013018:Sound Spectrography / Q000379:methods*; D016896:Treatment Outcome; D014827:Vocal Cords / Q000503:physiopathology*; D014833:Voice Quality / Q000502:physiology; D014834:Voice Training