title: [Clinical value of negative pressure tympanograms for diagnosis of middle ear effusion in adults].
abstract: OBJECTIVE
  To investigate the clinical value of negative pressure tympanograms for diagnosis of middle ear effusion in adults.
  
  
  METHODS
  GSI-Tympstar II Middle Ear Analyzer of America was used to test tympanogram peak pressure (TPP); tympanogram width (TW); middle ear resonant frequency and stapedius muscle reflex for sceptical secretory otitis media (SOM) adult patients. Patients (207 ears) with C type tympanograms accepted tympanocentesis after tests. According to middle ear effusion quantity, 207 ears have been divided to three groups: non-effusion group (123 ears), small-effusion group (45 ears) and mickle-effusion group (39 ears). Acoustic immittance and ipsilateral stapedius muscle reflex were statistically analysed.
  
  
  RESULTS
  About TPP and resonant frequency, non-effusion group and small-effusion group have statistical difference (P < 0.05); non-effusion group and mickle-effusion group have significant statistics different (P < 0.01). About TW, non-effusion group have significant difference from mickle-effusion group (P < 0.01). There was statistical difference on ipsilateral stapedius muscle reflex (P < 0.01) among three groups.
  
  
  CONCLUSIONS
  Negative pressure tympanograms has diagnostic value for middle ear effusion combined to TPP, TW, middle ear resonant frequency and ipsilateral stapedius muscle reflex.
authors.affiliation: Department of Otorhinolaryngology, Second Affiliated Hospital of Nanhua University, Hengyang 421001, China. zhiqiangluo9656@126.com
authors.forename: Zhiqiang
authors.initials: Z
authors.lastname: Luo
authors.forename: Juan
authors.initials: J
authors.lastname: Xiao
authors.forename: Yufang
authors.initials: Y
authors.lastname: Tan
mesh_terms: D000158:Acoustic Impedance Tests / Q000379:methods*; D000293:Adolescent; D000328:Adult; D000368:Aged; D004432:Ear, Middle / Q000473:pathology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010034:Otitis Media with Effusion / Q000175:diagnosis*; D055815:Young Adult