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Abstract Introduction Measurement of the electrically-evoked stapedial reflex threshold (ESRT) is an objective tool used to set the comfort levels in pediatric cochlear implant (PCI) users. The levels of ESRT have a strong correlation with comfort levels. However, the clinical utility of ESRT is limited because the ESRT response is not observed in all cochlear implant users. Objective To assess the effects of probe-tone frequency on ESRT and its relationship with the behavioral comfort levels in PCI users. Methods A total of 14 PCI users aged between 5 and 8 years participated in the study. The ESRT levels were measured using high-frequency probe tones (678 Hz and 1,000 Hz), and the default 226 Hz probe tone. The ESRT was measured with single-electrode stimulation across the three electrode locations (basal [E01]; middle [E11]; and apical [E22]). The ESRT levels measured with different probe tone frequencies were compared with the behavioral comfort levels. Results The mean ESRT levels using 1,000Hz and 678 Hz were lower than those measured using 226 Hz, but there was no main effect of probe-tone frequency (p > 0.05). A significantly high incidence of successful ESRT measurements occurred with higher-frequency probe tone (p < 0.039). Additionally, ESRT using higher probe tones significantly correlated with comfort levels. Conclusion The ESRT with higher probe tones was correlated with behavioral comfort levels and increased the success rate of the measurements. Higher-frequency probe tones may be useful whenever ESRT with 226 Hz is not measurable.
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Background: Hearing impairment is a major problem worldwide, significantly delaying acquisition of speech in children. Unfortunately delayed detection of hearing impairment especially in rural and remote areas, adds a significant burden to the society and the nation. Hence early detection of hearing impairment is imperative and the need of the hour lies in developing an easy, cost effective and reliable method for testing large number of neonates and infants. This study was to assess the effectiveness and utility of Tympanometry as a screening tool for assessment of middle ear pathology in neonates and infants. Middle ear disorders are significantly prevalent in young children. Aim: Investigating and comparing the results of visual inspection of the tympanic membrane to the results of Tympanometry with traditional probe tone (226 Hz) and high frequency probe tone (678 Hz) in” ears without effusion” and “ears with effusion” and to establish their sensitivity and specificity to detect middle ear disorders as a database in clinical practice. Materials and methods: Subjects were evaluated for the stable middle ear/ Eustachian tube function. Ears with no sign of effusion in the middle ear on otoscopy were labeled as “ears without effusion” and those who showed the presence of fluid in the middle ear were labeled as “ears with effusion”. Blinded to otoscopic ear exam results, Tympanometry was conducted with conventional probe tone of 226 Hz and high probe tone 678 Hz by audiologist using standard procedure. Results: Otoscopic examination results of ears for all age groups were evaluated and ears without effusion and with effusion were tabulated. Y. Kishore Kumar, Ajay Kumar Basod, G. Obulesu. Clinical study on low vs high probe tone frequency tympanometry in children: Rural population. IAIM, 2016; 3(10): 251-258. Page 252 Conclusion: The tympanometric parameters obtained with 226 Hz and 678 Hz probe tones have statistically significant differences in detecting the ears without effusion and with effusion. Compliance values also proved to be statistically different with the different probe tones.
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Objective To reduce the error caused by the non-linearity of headphone and device via the design of calibration algorithm for acoustic immittance.Methods Values of calibration chambers with different volumes (0.5,2.0 and 5.0 ml) were measured using the digital detection system.Then,the calibration data tables,for linearity calibration with inputting the values of acoustic immittance,were produced by means of processing the signal of acoustic immittance using the digital calibration algorithm based on the values from the calibration chambers,Results With the low frequency probe tone measurement,it was confirmed that the range of error among various calibration chambers with different volumes was 1％.Conclusion The calibration algorithm enables the improving of the detection accuracy and provides the reliable data for further clinical application.
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Objective To keep the intensity of sound constant and reduce the effect of ear canal difference on detection process.Methods Real-time detection of the probe tone in ear canal was carried out and by control ling the output circuit of the probe tone through the digital signal compensation algorithm,to realize real-time digital tympanometry of ear system and the function of constant pressure control.Results The results showed that the probe tone remained constant at 226 Hz for the measurement of middle ear and tympanometry was accurate.Conclusion The study simplified system configuration and provides basis for the clinical application.
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Objective To study a multiple frequency tympanometry on ear system. Methods Based on the original low frequency and single ingredient SY-IA tympanometry, the study mainly focused on such aspects as multiple frequency probe tone circuit, constant pressure sound control system, micropressor control system and multiple frequency acoustic immitance & phase angle detection circuit. Results Multiple frequency tympanometry on ear system could detect multiple frequency acoustic immitance and phase angle for normal ear, tympanum loosed ear and ossicular chain break ear under different probe tone. Conclusion Experiments show that multiple frequency tympanometry on ear system based on ARM is helpful to the diagnosis of pathological changes which are insensitive to single low frequency tympanometry.