title: [OSAHS patient gas up-take cross-sectional area nasopharynx sound reflection examination and significance].
abstract: OBJECTIVE
  To explore a simple and accurate method for localization of upper airway obstruction in patients with obstructive sleep apnea-hypopnea syndrome (OSAHS) and provide instructions for surgical treatment.
  
  
  METHODS
  Fifty OSAHS patients confirmed by PSG underwent acoustic rhinometric and pharyngometric assessment by Eccovision. The parameters were recorded, including nasal minimal cross-sectional area (NMCA), distance of MCA from the nostril (DCAN), minimum cross-sectional area at the nasal valve(MCA), nasal resistance (NR) and nasal volume from 0 to 6 cm from the nostril (NCV), as well as pharyngeal cross-sectional area (CSA) and volume from 4.8 to 15.0 cm. The sensitivity and specificity of acoustic rhinometry and pharyngometry on localization of airway obstruction was determined by a comprehensive imaging and endoscopic study.
  
  
  RESULTS
  In 50 cases with severe OSAHS, NMCA, DCAN, MCA, NCV, NR were (0.61 +/- 0.35) cm2, (2.06 +/- 0.12) cm, (0.87 +/- 0.12) cm2, (9.24 +/- 2.31)cm3 and (0.51 +/- 0.32)kPa/(L x min), respectively. Pharyngeal CSA and volume were statistically significantly lower than that in control group (P < 0.01). The value of DCAN was (2.06 +/- 0.12) cm, (9.50 +/- 4.08) cm, (13.10 +/- 2.52) cm in type I II, III patient, respectively. Compared with the control group, the difference was statistically significant.
  
  
  CONCLUSIONS
  Acoustic rhinometry and pharyngometry is a simple and safe method in localization of airway obstruction in patients with OSAHS.
authors.affiliation: Department of Otolaryngology, Yinzhou People's Hospital, Ningbo, 315040, China.
authors.forename: Jiandao
authors.initials: J
authors.lastname: Hu
authors.forename: Juntian
authors.initials: J
authors.lastname: Lang
authors.forename: Jianchun
authors.initials: J
authors.lastname: Liao
authors.forename: Wanjun
authors.initials: W
authors.lastname: Yu
authors.forename: Jianyao
authors.initials: J
authors.lastname: Zhang
authors.forename: Tao
authors.initials: T
authors.lastname: Jiang
authors.forename: Cheng
authors.initials: C
authors.lastname: Cao
authors.forename: Shao
authors.initials: S
authors.lastname: Zhou
authors.forename: Dong
authors.initials: D
authors.lastname: Ren
mesh_terms: D000328:Adult; D000368:Aged; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009296:Nasal Cavity / Q000503:physiopathology*; D009305:Nasopharynx / Q000503:physiopathology; D023842:Rhinometry, Acoustic; D020181:Sleep Apnea, Obstructive / Q000503:physiopathology*; D055815:Young Adult