ILO Home
Go to the home page
Site map | Contact us Franšais | Espa˝ol

CISDOC database

Document ID (ISN)55332
CIS number 91-296
ISSN - Serial title 0095-6562 - Aviation, Space, and Environmental Medicine
Year 1990
Convention or series no.
Author(s) Devine J.A., Forte V.A., Rock P.B., Cymerman A.
Title The use of typanometry to detect aerotitis media in hypobaric chamber operations
Bibliographic information Mar. 1990, Vol.61, No.3, p.251-255. Illus. 20 ref.
Abstract Diagnosis and quantification of aerotitis media were performed using a modified commercially-available tympanometer under hypobaric conditions. Subjects were 22 males and 9 females, 22-43 years of age, who were tested in each ear with the tympanometer prior to and after exposure, sequentially at the barometric pressue plateaus of 706, 656, 609, 586, 564, and 522mm Hg, and following an induced ear block during a 1-min descent from 522 to 586mm Hg. Each subject was examined once either alone or in pairs during a 90-min exposure. Aerotitis media was detected using tympanometry at simulated altitude as evidenced by the difference between measurements made during induced ear blocks and those made prior to inducement, as well as following relief of the pressure differential with the Valsolva manoeuvre. There were no significant differences between pre- and post-induced aerotitis media values at 586mm Hg, or between pre- and post-hypobaria. Thus, tympanometry can be a valuable tool in managing aerotitis media in the aeromedical environment.
Descriptors (primary) decompression otitis; negative pressure; diagnosis; diseases of middle ear; otitis media; barotrauma
Descriptors (secondary) human experiments
Document type D - Periodical articles
Country / State or ProvinceUSA
Subject(s) Occupational pathology
Broad subject area(s) Physical hazards
Browse category(ies) Diseases of the ear and hearing damage
Hypobaric pressure
Hyperbaric pressure