Ahmad S W, Ramani G V
J Laryngol Otol. 1979 Nov;93(11):1091-8. doi: 10.1017/s0022215100088162.
70 patients with dry central perforations have been studied to assess the hearing loss. The hearing loss is greater at the lower frequencies and increases with the size of the perforation. Malleolar perforations cause more hearing loss than the non-malleolar unless the perforation involves less than 10 per cent of the tympanic membrane surface area. Perforations of the postero-inferior quadrant cause more hearing loss than those in the antero-inferior quadrant.
对70例干性中央穿孔患者进行了研究，以评估听力损失情况。低频听力损失更严重，且随穿孔大小增加而加重。除非穿孔累及鼓膜表面积小于10%，否则锤骨穿孔比非锤骨穿孔导致的听力损失更多。后下象限穿孔比前下象限穿孔导致的听力损失更多。
