title: Aerodynamics of the pseudo-glottis.
abstract: OBJECTIVE
  The aim of this work is to study the hitherto unclear aerodynamic parameters of the pseudo-glottis following total laryngectomy. These parameters include airflow rate, sub-pseudo-glottic pressure (SubPsG), efficiency and resistance, as well as sound pressure level (SPL).
  
  
  METHODS
  Eighteen male patients who have undergone total laryngectomy, with an age range from 54 to 72 years, were investigated in this study. All tested patients were fluent esophageal 'voice' speakers utilizing tracheo-esophageal prosthesis. The airflow rate, SubPsG and SPL were measured.
  
  
  RESULTS
  The results showed that the mean value of the airflow rate was 53 ml/s, the SubPsG pressure was 13 cm H(2)O, while the SPL was 66 dB. The normative data obtained from the true glottis in healthy age-matched subjects are 89 ml/s, 7.9 cm H(2)O and 70 dB, respectively. Other aerodynamic indices were calculated and compared to the data obtained from the true glottis.
  
  
  CONCLUSIONS
  Such a comparison of the pseudo-glottic aerodynamic data to the data of the true glottis gives an insight into the mechanism of action of the pseudo-glottis. The data obtained suggests possible clinical applications in pseudo-voice training.
authors.affiliation: Unit of Phoniatrics, Faculty of Medicine, Ain Shams University, Cairo, Egypt. nkotby@cng.com.eg
authors.forename: M N
authors.initials: MN
authors.lastname: Kotby
authors.forename: M A
authors.initials: MA
authors.lastname: Hegazi
authors.forename: I
authors.initials: I
authors.lastname: Kamal
authors.forename: N
authors.initials: N
authors.lastname: Gamal El Dien
authors.forename: J
authors.initials: J
authors.lastname: Nassar
mesh_terms: D000368:Aged; D000399:Air Pressure; D005931:Glottis / Q000502:physiology*; D006801:Humans; D007831:Larynx, Artificial; D008297:Male; D008875:Middle Aged; D013072:Speech, Esophageal