The Effects of Middle Ear Negative Pressure on the Transiently Evoked (TEOAEs)and Distortion Product (DPOAEs) Otoacoustic Emissions.
- Author:
Hoon Young WOO
1
;
Joo Tea KIM
;
Dae Hyoung KWON
;
Kun Sik YOON
;
In Bum KIM
Author Information
1. Department of Otolaryngology, Sanggye Paik Hospital, College of Medicine, Inje University, Seoul, Korea.
- Publication Type:Original Article
- Keywords:
Middle ear negative pressure;
Transiently evoked(TEOAEs) and Distortion product otoacoustic emissions(DPOAEs)
- MeSH:
Adenoidectomy;
Child;
Ear;
Ear Canal;
Ear, Middle*;
Hearing;
Humans;
Mass Screening;
Otoscopy;
Tonsillectomy
- From:Korean Journal of Otolaryngology - Head and Neck Surgery
1998;41(2):154-159
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
BACKGROUND AND OBJECTIVES: The clinical utility of otoacoustic emissions (OAEs) has been well established in childhood hearing screenings. As middle ear negative pressure prevails in normal children, and since all OAEs must be transmitted through the middle ear before they can be measured in the ear canal, OAEs can be affected by middle ear negative pressure. The purpose of this study is to elucidate the effect of middle ear negative pressure on the detectability of OAEs. MATERIAL AND METHODS: TEOAEs were recorded for 36 ears using click before & after tonsillectomy and, or adenoidectomy (T and, or A) operations. Before & after T and or A operations, DPOAEs were generated at six geometric mean frequencies between 1-6 kHz for two different groups, Group I (40 ears) and Group II (36 ears). Group I: 3(f2/f1) ratios (1.21, 1.22 and 1.23) were used at the fixed stimulus level (70-70 dB SPL). Group II:3 stimulus levels were used (70-70 dB SPL, 60-70 dB SPL and 30-40 dB SPL). RESULTS: The negative middle ear pressure attenuated low frequency emission more than high frequency emission. CONCLUSION: Negative middle ear pressure may increase false alarm. So pneumatic otoscopy and aural immittance testing should be utilized to predict the feasibility of applying OAEs in childhood hearing screening test.
