正常人短增量敏感指数与测试音听力级关系探讨

Correlation Between SISI Score and hearing level of carrier tone in normal subjects

目的探讨正常人短增量敏感指数（SISI）与测试音听力级关系。方法试验频率用1kHz、2kHz和4kHz，从听阈上15dBSL和20dBSL开始，逐档递增强度10dB进行SISI，直至95dBHL时止。结果3个频率的SISI均随听力级的递增而增高，在65dBHL～95dBHL甚或更高的听力级容易达到SISI高得分。已显示出SISI与测试音听力级呈正相关。结论SISI高得分易于在高强度声刺激下出现，表明高强度测试音SISI试验是鉴别耳蜗性聋和蜗后聋的重要听力学检查法。

Goal:To study relationship between short increment sensitivity index(SISI)score and presentation level of steady-state pure tones in normal persons. Method:SISI tests were performed by presenting carrier tones of 1kHz, 2kHz and 4kHz at increasing intensities from 15dBSL and 20dBSL in two groups of normal persons. The presentation level of the carrier tones was raised in 10dB steps until 95dBHL. Results: Scores on SISI elevated with increasing intensity of presenting tones at the frequencies of 1kHz, 2kHz and 4kHz. High scores of 70% or higher on SISI were obtained at intensity of 65-95dBHL with close correlation. Conclusion:High scores on SISI test tend to be found at increased intensity of carrier tones. High level SISI test is one of significant auditory tests for site of lesion in differentiating cochlear hearing loss from the retrocochlear hearing loss,particularly resulted from the eighth nerve tumor.