title: Evaluation of the Distance Between Anterior Commissure of True Vocal Folds and the First Tracheal Ring and Related Laryngeal Indices in 40 Human Cadavers.
abstract: OBJECTIVE
  Distorted anatomy in laryngotracheal pathologies expresses the need to determine a quantitative mean of the distance between the anterior commissure of true vocal folds and the first tracheal ring to better define whether a lesion is in the subglottis or has extended toward the trachea.
  
  
  METHODS
  This is a descriptive cross-sectional study.
  
  
  METHODS
  In 40 cadavers, the larynx was exposed with an apron cut. The laryngofissure cut opened the larynx via the lateral aspect so that the anterior commissure was exposed. A needle was passed through the thyroid cartilage to reach the anterior commissure. The second needle was crossed over the first tracheal ring. The distance between the two needles was measured.
  
  
  RESULTS
  The mean distance between the anterior commissure of true vocal folds and the first tracheal ring was 26.82 ± 4.28 mm (21.3-42.5 mm) in our subjects. This distance was 27.27 ± 4.45 and 25.05 ± 3.2 mm, in men and women, respectively. There was no statistically significant correlation between this distance with body mass index (BMI), age, and sex.
  
  
  CONCLUSIONS
  The distance between the anterior commissure and the first tracheal ring in patients with laryngotracheal pathologies helps in determining the best therapeutic plan for patients.
authors.affiliation: Sinus and Surgical Endoscopic Research Center, Department of Otolaryngology, Imam Reza Educational Hospital, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran.
authors.forename: Mehdi
authors.initials: M
authors.lastname: Bakhshaee
authors.affiliation: Sinus and Surgical Endoscopic Research Center, Department of Otolaryngology, Imam Reza Educational Hospital, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran. Electronic address: khadivie@mums.ac.ir.
authors.forename: Ehsan
authors.initials: E
authors.lastname: Khadivi
authors.affiliation: Sinus and Surgical Endoscopic Research Center, Department of Otolaryngology, Imam Reza Educational Hospital, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran.
authors.forename: Rahman
authors.initials: R
authors.lastname: Movahed
authors.affiliation: Department of Otolaryngology, Mashhad University of Medical Sciences, Mashhad, Iran.
authors.forename: Masoud
authors.initials: M
authors.lastname: Naserisadr
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D059925:Anatomic Landmarks; D015992:Body Mass Index; D002102:Cadaver; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D007830:Larynx / Q000033:anatomy & histology*; D008297:Male; D008875:Middle Aged; D012737:Sex Factors; D013957:Thyroid Cartilage / Q000033:anatomy & histology*; D014132:Trachea / Q000033:anatomy & histology*; D014827:Vocal Cords / Q000033:anatomy & histology*; D055815:Young Adult
keywords: Anterior commissure; BMI; Cadaver; Subglottis; Trachea; True vocal fold