论文部分内容阅读
中耳功能障碍引起传导性聋,亦称“传导性聋”,纯音测听表现为气骨导差。当传导完全阻滞时,此类患者的听阈(HL)可达50～60dB。 正常中耳的功能是“阻抗调适”。若中耳功能受损,被淋巴液充满的内耳对声波的传入产生一个很大的阻力(阻抗),致使98％的声波被反射回来。而功能完好的中耳则能克服这种阻力,使60％的声波能传入内耳。若同时合并感觉神经性聋(内耳性聋或中枢性聋),即骨导曲线明显偏离正常,则称混合性聋。
Middle ear dysfunction caused by conductive deafness, also known as “conductive deafness”, pure tone audiometry showed air conduction. When conduction is completely blocked, the hearing threshold (HL) of such patients can reach 50-60 dB. Normal middle ear function is “impedance adjustment.” If the middle ear function is impaired, the inner ear filled with lymphatic fluid creates a large resistance (impedance) to the incoming sound waves, causing 98% of the sound waves to be reflected back. The well-functioning middle ear can overcome this resistance, so that 60% of the sound waves can be transmitted to the inner ear. If combined with sensory nerve deafness (inner ear deafness or central deafness), that is, bone conduction curve deviated significantly from normal, then said mixed deafness.