Effect Of Different Strategies On High-frequency Gain Of Hearing Aids In Ears With Moderate Sensorineural Hearing Loss And High-frequency Cochlear Dead Regions

Objective In order to identify effect of different high-frequency gain strategies on hearing aids to patients with moderate sensorineural hearing loss and high-frequency cochlear dead regions,three different high-frequency strategies including full-frequency gain,3k Hz lowpass gain,and 2k Hz low-pass gain were used to test speech discrimination score(SDS),quiet sentence recognition rate test,quick speech-in-noise(Quick SIN).Methods Threshold equalizing noise test(TEN test)was performed in 87 patients(152 ears)with moderate sensorineural hearing loss.22 ears with high frequency cochlear dead regions were the experimental group,and 30 ears without cochlea dead regions were the control group.Using the DSL adult prescription formula,after the real ear analysis test,three different high-frequency strategies of full-frequency gain,low-pass gain of 3k Hz,and low-pass gain of 2k Hz were used for the following tests: single-syllable identification,sentence recognition in quiet environment and quick Speech-in-Noise.The monosyllable recognition rate,the quiet sentence recognition rate,and the signal-to-noise ration loss(SNR loss)of each group of subjects in each high-frequency gain mode were obtained.The test results were analyzed with statistical software SPSS19.0 to study the differences in speech recognition rates between the experimental and control groups in three different high-frequency gain modes.Results(1)The incidence of cochlea dead region in ears with moderate sensorineural hearing loss was 21.05%(32/152).(2)There was a statistically significant difference in the monosyllable recognition rate among the three different high-frequency hearing aid gain patterns in the experimental group(P<0.05).There was no significant difference in the sentence recognition rate in quiet environment and SNR loss(P>0.05).There was a statistically significant difference in monosyllable recognition rate and SNR loss between the three groups of high-frequency hearing aid gain patterns in the control group(P<0.05).There was no significant difference in the sentence recognition rate of in quiet environment(P>0.05).(3)In the full-frequency gain mode,the monosyllable recognition rate,the sentence recognition rate in quiet environment and SNR loss of the experimental group and the control group were statistically significant(P<0.05).Conclusion(1)The speech recognition ability of moderate sensorineural hearing loss ears with high-frequency cochlear dead regions is significantly lower in the full-frequency gain mode than in those without cochlear dead regions.(2)For moderate sensorineural hearing loss with high frequency cochlear dead regions and those without cochlear dead regions,2k-3k Hz in hearing aid fitting is crucial for speech recognition ability,and sufficient gain should be given in clinical fitting,high-frequency information after 3k Hz in hearing aid has little effect on speech recognition ability.(3)Moderate sensorineural hearing loss with highfrequency cochlear dead regions can be used to magnify the high-frequency gain according to the prescription formula of the hearing aid in the clinical fitting.