title: Phonation threshold pressure estimation using electroglottography in an airflow redirection system.
abstract: OBJECTIVE
  The present study proposed to estimate phonation threshold pressure (PTP) noninvasively using airflow redirection into a pneumatic capacitance system.
  
  
  METHODS
  Prospective study.
  
  
  METHODS
  Subjects phonated into the device, which interrupts airflow mechanically and redirects the flow into a pneumatic capacitor. Five interruptions were effected per trial. PTP was estimated as the difference between subglottal pressure (SGP) and transglottal pressure at phonation offset. The novel method was tested for consistency in 20 normal human subjects at low (75 dB) and high (85 dB) sound pressure levels. The device was tested for validity on a tracheotomy patient.
  
  
  RESULTS
  Mean SGP was 9.02 +/- 3.27 cm H(2)O, and mean PTP was 3.68 +/- 1.41 cm H(2)O. Intrasubject coefficient of variation, a measure of intrasubject consistency, was 0.33 +/- 0.23. Statistically significant differences existed between the means of SGP but not PTP at 75 dB and 85 dB. The correlation coefficient between accepted and experimental SGP in a tracheotomy patient was 0.947 (P < .001).
  
  
  CONCLUSIONS
  Measurements corresponded well to previously reported values, and intrasubject variability was low, indicating the device was consistent. Testing on a tracheotomy patient demonstrated validity. More research is needed to determine the sensitivity and specificity of the device in differentiating between normal and pathological voices. This device may have clinical application as a noninvasive and reliable method of estimating PTP and indicating that laryngeal health is likely abnormal.
authors.affiliation: Department of Surgery, Division of Otolaryngology-Head and Neck Surgery, University of Wisconsin-Madison School of Medicine and Public Health, Madison, Wisconsin 53706, USA.
authors.forename: Adam L
authors.initials: AL
authors.lastname: Rieves
authors.forename: Michael F
authors.initials: MF
authors.lastname: Regner
authors.forename: Jack J
authors.initials: JJ
authors.lastname: Jiang
mesh_terms: D000293:Adolescent; D000328:Adult; D004568:Electrodiagnosis / Q000379:methods*; D006801:Humans; D007830:Larynx / Q000503:physiopathology*; D010699:Phonation / Q000502:physiology*; D011312:Pressure; D011446:Prospective Studies; D013068:Speech Production Measurement; D014140:Tracheotomy; D014681:Velopharyngeal Insufficiency / Q000175:diagnosis* / Q000503:physiopathology; D055815:Young Adult
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