title: [Study of physiological parameters of velopharyngeal function by nasopharyngeal fibroscope].
abstract: OBJECTIVE
  Velopharyngeal incompetency (VPI) could be found in certain healthy people when some vowels were produced. Since neither asophia nor organic deformity do they have, it should be considered as physiological VPI. VPI which exists commonly in patients with cleft palate is also an unsatisfactory manifestation after palatoplasty. In order to distinguish between physiological VPI and pathological VPI in patient with cleft palate and establish an objective criterion, it is necessary to assess the occurrence and extent of VPI in healthy people.
  
  
  METHODS
  The velopharyngeal function of 890 subjects with normal speech was studied dynamically by nasopharyngeal fiberscope (NPF). Two vowels /i/ and /u/ were examined. The rates of velopharyngeal incompetence (RVPI) of vowel /i/ and /u/ were analyzed.
  
  
  RESULTS
  VPI was found in 117 (13.15%) when vowel /i/ was produced. VPI was occurred in 100 (11.24%) when /u/ was produced. The RVPI mean of vowel /i/ is 11.285% +/- 7.248 in 112 subjects, while that of /u/ is 9.066% +/- 6.162 in 96. No significant difference was obtained in age or sex.
  
  
  CONCLUSIONS
  It can be used to evaluate the velopharyngeal function after palatoplasty as physiological parameters.
authors.affiliation: School of Stomatology, Shanghai Second Medical University, Shanghai, 200011.
authors.forename: W
authors.initials: W
authors.lastname: Yuan
authors.forename: J
authors.initials: J
authors.lastname: Xia
authors.forename: M
authors.initials: M
authors.lastname: Zhu
mesh_terms: D000328:Adult; D002648:Child; D019723:Endoscopes; D005260:Female; D006801:Humans; D008297:Male; D009305:Nasopharynx / Q000502:physiology*; D014681:Velopharyngeal Insufficiency / Q000175:diagnosis*