title: Stroboscopy versus high-speed glottography: a comparative study.
abstract: OBJECTIVE
  To evaluate and to compare the diagnostic value of videostroboscopy (VS) and high-speed glottography (HGG) in dysphonic patients.
  
  
  METHODS
  Randomized, prospective study.
  
  
  METHODS
  A total of 162 patients underwent indirect laryngoscopy using both methods (VS and HGG). The resulting 324 films were evaluated by two professionals (laryngologists, MDs) using a standardized protocol containing established criteria to classify vocal fold vibratory movement qualities.
  
  
  RESULTS
  The rating "not assessable" was mentioned significantly more often in VS than in HGG (P < .001). In HGG, methodologic failures were less frequent, and the length of investigation was shorter. Even if the agreement between the two raters was higher in HGG (54%) compared with VS (42%), both percentage values show a low accordance in diagnostic findings.
  
  
  CONCLUSIONS
  Regardless of the method used (VS or HGG), perceptive evaluations of vibratory movements of vocal folds revealed a higher variability than assumed. This result supports the need for objective methods to analyze vocal fold vibratory movements. Therefore, real-time imaging of vocal fold vibratory movements using HGG will be necessary.
authors.affiliation: Department of Phoniatrics and Pedaudiology, University of Göttingen, Göttingen, Germany. olthoff@med.uni-goettingen.de
authors.forename: Arno
authors.initials: A
authors.lastname: Olthoff
authors.forename: Christina
authors.initials: C
authors.lastname: Woywod
authors.forename: Eberhard
authors.initials: E
authors.lastname: Kruse
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002277:Carcinoma / Q000453:epidemiology / Q000601:surgery; D005260:Female; D005931:Glottis; D006099:Granuloma / Q000453:epidemiology / Q000601:surgery; D006801:Humans; D007825:Laryngectomy; D007828:Laryngoscopy / Q000379:methods*; D008297:Male; D008875:Middle Aged; D010036:Otolaryngology / Q000295:instrumentation*; D011127:Polyps / Q000453:epidemiology / Q000601:surgery; D011446:Prospective Studies; D012720:Severity of Illness Index; D014827:Vocal Cords / Q000601:surgery; D014832:Voice Disorders / Q000175:diagnosis* / Q000453:epidemiology / Q000503:physiopathology