There are no TM perforation in both groups but most of the cochleas showed loss of outer hair cells or reduced activity of succinic dehydrogenase (SDH).

• 两组动物均未见鼓膜穿孔,但绝大多数耳蜗显示有外毛细胞丢失或琥珀酸脱氨酶(SDH)酶活性降低。