Effect of Cochlear Dead Regions on Speech Recognition in Patients with Mild to Moderate Sensorineural Hearing Loss under Different Signal-to-noise Ratio
Objective To study the speech recognition rates of patients with mild to moderate sensorineural hearing loss with or without cochlear dead regions under quiet and different signal-to-noise ratio,and the difference of speech recognition rates between the two groups under the same test conditions.Methods A total of 44 ears with mild to moderate sensorineural hearing loss were selected via pure tone audiometry.The patients were divided into non-cochlear dead regions group and cochlear dead regions group according to the results of the threshold equalizing noise test.The monosyllabic speech test materials(MSTMs)were used to assess the speech recognition score of the two groups of patients in quiet and speech spectrum noise environments(SNR=6,3,0,-3 dB).Results There were 1～2 cochlear dead regions in the dead regions group mostly in 3～4 kHz regions.Speech recognition of the two groups of patients in different test environments decreased with the reduction of signal-to-noise ratio(P＜0.05)and there were significant differences in speech recognition scores between the two groups under different SNR con-ditions(P＜0.05).Conclusion The speech recognition scores of patients with mild to moderate sensorineural deaf-ness decreased significantly with the decrease of signal-to-noise ratio.Under each signal-to-noise ratio,the speech recognition scores of the cochlear dead regions group was lower than that of the non-cochlear dead regions group.It is necessary to carry out cochlear dead regions test for patients with mild to moderate sensorineural hearing loss.
Cochlear dead regionsSpeech recognitionTEN testSignal-to-noise ratio
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