title: Comparison of a eustachian barotubometer with a tympanometer to evaluate eustachian tube function in chronic suppurative otitis media.
abstract: OBJECTIVE
  To compare the eustachian tube function results of a eustachian barotubometer with those of a tympanometer in the dry and quiescent stages of tubotympanic chronic suppurative otitis media. This study was undertaken to find a simple, reliable, and inexpensive alternative to the conventional tympanometer that is used on a perforated ear drum.
  
  
  METHODS
  Prospective cross-sectional study of 1 year's duration.
  
  
  METHODS
  Otolaryngology outpatient clinic of a tertiary referral centre.
  
  
  METHODS
  A forced opening test and a physiologic opening test of the eustachian tube were performed on 31 ears with quiescent tubotympanic chronic suppurative otitis media and 38 ears with dry tubotympanic chronic suppurative otitis media selected at random. Both tests were performed by two separate observers using a eustachian barotubometer first and then the tympanometer in perforated mode.
  
  
  METHODS
  Forced opening response and physiologic opening response of the eustachian tube.
  
  
  RESULTS
  Contingency tables (2 x 2) were drawn using the findings of the tests on the two instruments separately for the forced opening test and the physiologic opening test. For the former test, the sensitivity was 100%, specificity was 20%, validity was 94.20%, and positive likelihood ratio was 1.25. For the latter test, the sensitivity was 96.87%, specificity was 60%, validity was 94.20%, and positive likelihood ratio was 2.42.
  
  
  CONCLUSIONS
  The eustachian barotubometer is a simple, reliable, and inexpensive alternative for preoperative screening of eustachian tube function in the dry and quiescent stages of tubotympanic chronic suppurative otitis media.
authors.affiliation: Department of Otolaryngology, Head and Neck Surgery, Karnataka Institute of Medical Sciences, Hubli, India. vikram.ent@gmail.com
authors.forename: Vikram K
authors.initials: VK
authors.lastname: Bhat
authors.forename: Praveen R
authors.initials: PR
authors.lastname: Kumar
authors.forename: Mythri
authors.initials: M
authors.lastname: Nag
authors.forename: Jyotirmay
authors.initials: J
authors.lastname: Hegde
mesh_terms: D000158:Acoustic Impedance Tests; D000293:Adolescent; D000328:Adult; D000368:Aged; D002908:Chronic Disease; D003430:Cross-Sectional Studies; D005064:Eustachian Tube / Q000503:physiopathology*; D005260:Female; D006801:Humans; D008297:Male; D008365:Manometry; D008875:Middle Aged; D010035:Otitis Media, Suppurative / Q000150:complications / Q000175:diagnosis* / Q000503:physiopathology*; D011446:Prospective Studies; D018058:Tympanic Membrane Perforation / Q000209:etiology; D055815:Young Adult