患儿,男,2.5岁.因听力下降3个多月于1993年7月10日来诊.患儿系第一胎,足月顺产,父母非近亲婚配,否认同样病家族史.2岁时可喊“爸爸”、“妈妈”等词.3个多月前因感冒后患“肺炎”,在本村卫生室肌注青、链霉素5天(剂量不详)后,发现患儿对周围强声反应迟钝,且发音愈来愈不清晰.查体见双侧外耳道及鼓膜正常.声导纳检查,双耳鼓室图均为A型,峰压点左0 daPa,右5 daPa.静态声顺左 Children, male, 2.5 years old, had hearing loss for more than 3 months and came to the clinic on July 10, 1993. The first child of the child was born in full term and the non-relatives of the parents were married, denied the same family history. Can cry “father”, “mom” and other words .3 months ago due to cold after suffering from “pneumonia”, in the village health room muscle injection, streptomycin 5 days (dose unknown), found that children around the strong sound Unresponsive, and the pronunciation is more and more unclear. Physical examination of the bilateral external auditory canal and tympanic membrane normal. Acoustic admittance examination, both ears tympanogram are A type, the peak pressure point 0 daPa, right 5 daPa.