Murthy V S, Malhotra S K, Bala I, Raghunathan M
Department of Anaesthesia, Postgraduate Institute of Medical Education & Research, Chandigarh.
Indian J Med Res. 1995 May;101:213-6.
Twenty anaesthesia residents were exposed to a pre-recorded audio cassette of operating room noise. The noise level during exposure was maintained at 77.32 +/- 1 dB (A), which was the calculated average operating room noise in our institute. Two auditory functions i.e., speech reception threshold and speech discrimination were studied before and during exposure to noise in a pre-fixed order. The right and left ears were tested separately. Speech reception threshold showed a mean increase of 23.75 +/- 6.86 dB (A) for the right ear and 26.25 +/- 6.90 dB(A) for the left ear during exposure to noise, suggesting that speech communication may be possible only by raising the voice. Speech discrimination showed a mean percentage decrease of 23.3 +/- 4.82 per cent for the right ear and 23.5 +/- 3.89 per cent for the left ear implying that there can be a steep decrease in the ability to discriminate spoken words.
20名麻醉住院医师收听了一盘预先录制的手术室噪音录音带。暴露期间的噪音水平维持在77.32 +/- 1 dB（A），这是我们研究所计算得出的手术室平均噪音水平。在暴露于噪音之前和期间，按照预先确定的顺序研究了两项听觉功能，即言语接受阈和言语辨别力。左右耳分别进行测试。在暴露于噪音期间，右耳的言语接受阈平均增加了23.75 +/- 6.86 dB（A），左耳增加了26.25 +/- 6.90 dB（A），这表明可能只有提高音量才能进行言语交流。言语辨别力方面，右耳平均下降了23.3 +/- 4.82%，左耳平均下降了23.5 +/- 3.89%，这意味着辨别口语单词的能力可能会急剧下降。
