ABSTRACT
Survery and comparison between the physical characteristics of Distortion-Product Otoacoustic Emissions of 1- 59 day-old normal-hearing newborns refered to TUMS, Rehabilitation School , Audiology department , 2002. This analytical-descriptive study was conducted on the ears of 102 easy method selected newborns. The tests included: otoscopy , BOA, Immittance audiometry , DPOAEs, and ABR if necessary. The amplitude and frequency of 2f[1]-f[2] emissions of DPOAEs evoked by two pure tones [L1=65 dBSPL , L2=50 dBSPL and f2/f1=1.2] were also calculated. All normal hearing newborns have normal DPOAEs. No significant difference was observed in test-retest. The amplitude of the DPOAEs to the right ear is significantly greater than the amplitude of the left ear [P<00.05]. No significant difference was observed between newborn's DPOAEs in terms of their gender. DPOAEs could be measured quickly and noninvasively and are excellent tools for the screening of newborn hearing loss. The results are valid only within the Context of this research
ABSTRACT
To determine SOAE,TEOAE, and DPOAE, characteristics in normal -hearing school boys. This cross-sectional study was conducted on 7-11 year-old normal -hearing boys [n 100] living in 12th zone of Tehran. OAEs also performed and investigated if otoscopy, pure tone and immittance audiometry were normal. Both handedness and ear effects was also considered. 31% had SOAEs. No significant differrence between the right and lefe ear SOAEs frequency and amplitude means. 1,3 kHz and total response TEOAEs amplitude was significantly different between two ears. There was no significant difference between both ear DPOAEs amplitudes, whereas the letf-handed boys' DPOAE amplitude is greater than the right - handed ones' amplitudes. As some results including equal SOAEs of both ears , no difference between both ears SPOAEs amplitude , and handedness effect on the amplitude do not agree with other studies , these finding should be considered in testing OAEs of school boys
ABSTRACT
Determining the prevalence of hearing loss and correlated factors in clients referring to audiology clinic of Buali hospital. This cross-sectional analytic-descriptive survery was carried out on six thousand and twenty ears of 3010 clients [1651 ,a;e and 1359 female] in Audiology clinic of Buali hospital , during Sept 2000 to Sept 2001. Hearing loss is the most common reason for referring the clients [20.5%]. 1319 ears [21.9%] Showed sensorineural hearing impairment and conductive and mixed hearing loss are observed in 1059 [17.6%] and 234 [3.9%] ears, respectedly. Hearing loss degree most cases is mild [14%] in both ears. There is no significant difference between male and female hearing threshold means [p>0.05] but a significant difference between hearing thresholds is observed in terms of age [p<0.05]. Audiogram configuration in most cases is flat [55.1%]. Otoscopic examination reveals abnormal condition in 2333 ears [38.8%] . 37.2% of the studied cases have abnormal tympanogram mostly type B [15.9%]. 2.2% of the clients wear hearing aid that mostly have B.T.E ones [1.5%]. 6.2% of the clients , depends on their hearing impairment type and degree need rehabilitation services. The results are Valid only in the context of this study and it's generaliztion needs further researches