title: Videostrobokymographic analysis of benign vocal fold lesions.
abstract: OBJECTIVE
  Videostrobokymography (VSK) has recently been introduced. The aim of this study was to analyze vibratory patterns and objective parameters in various benign vocal fold lesions using VSK and to examine the efficacy of VSK in clinical applications.
  
  
  METHODS
  Using VSK, we analyzed the vibration patterns of normal vocal folds, various benign lesions such as nodules, polyps, cysts and Reinke's edema and cases of unilateral vocal fold paralysis. We also calculated the objective parameters open quotient and asymmetric index and compared them with their mean values in normal controls.
  
  
  RESULTS
  In nodules, polyps and cysts, the open quotient at the site of the lesion was similar to the mean value in the normal controls; however, on the other parts of the vocal folds, it was much larger than the normal mean value. In Reinke's edema, irregular and asymmetric vibrations were observed. The posterior area of the vocal folds showed larger open quotients than the anterior area. In unilateral vocal fold paralysis, irregular vocal fold vibration and incomplete closure of the vocal folds were documented. Much larger asymmetric indices were calculated for unilateral vocal fold paralysis than in normal controls or for other lesions. The asymmetric index may be a good quantitative parameter of vibration in patients with vocal fold paralysis.
  
  
  CONCLUSIONS
  This study demonstrated that VSK could generate clear quantitative documentation of fine vibrations of vocal folds in many different types of benign lesion. VSK has the potential to be an effective tool for the quantitative analysis of vibratory patterns of vocal folds in clinical settings.
authors.affiliation: Department of Otolaryngology-Head and Neck Surgery, Dong-A University, Busan, South Korea.
authors.forename: Dong-Young
authors.initials: DY
authors.lastname: Kim
authors.forename: Lee-Suk
authors.initials: LS
authors.lastname: Kim
authors.forename: Kwang Hyun
authors.initials: KH
authors.lastname: Kim
authors.forename: Myung-Whun
authors.initials: MW
authors.lastname: Sung
authors.forename: Jong-Lyel
authors.initials: JL
authors.lastname: Roh
authors.forename: Tack-Kyun
authors.initials: TK
authors.lastname: Kwon
authors.forename: Sang Joon
authors.initials: SJ
authors.lastname: Lee
authors.forename: Seung-Ho
authors.initials: SH
authors.lastname: Choi
authors.forename: Soo-Geun
authors.initials: SG
authors.lastname: Wang
authors.forename: Mee-Young
authors.initials: MY
authors.lastname: Sung
mesh_terms: D003560:Cysts / Q000175:diagnosis / Q000503:physiopathology; D004487:Edema / Q000175:diagnosis / Q000503:physiopathology; D006801:Humans; D007734:Kymography / Q000379:methods; D007818:Laryngeal Diseases / Q000175:diagnosis / Q000503:physiopathology*; D007828:Laryngoscopy / Q000379:methods; D011127:Polyps / Q000175:diagnosis / Q000503:physiopathology; D014732:Vibration; D014741:Video Recording; D014826:Vocal Cord Paralysis / Q000175:diagnosis / Q000503:physiopathology; D014827:Vocal Cords / Q000503:physiopathology*