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采用随机分组法探讨预防性使用滴耳剂对鼓膜切开置管术后耳溢液发生率的影响。所研究的对象为9月～11岁的小儿,均先接受10天抗生素,随后再进行4周预防性抗生素加缩血管剂治疗。术前检查包括耳镜检查、鼻咽部检查、鼓室测压、纯音测听。感音神经性聋、腭裂、免疫抑制及对氨基甙类药物敏感的病人均不列入本研究。术前7天均未用过抗生素。术中将病人随机分成三组:第一组不用庆大霉素滴耳剂,第二组仅于置管后立即用一次庆大霉
Randomized grouping method was used to investigate the effect of prophylactic ear drops on the incidence of postoperative ear discharge after tympanotomy. Subjects studied were September to 11-year-old children, all received 10 days of antibiotics, followed by another 4 weeks of preventive antibiotic plus vasopressor therapy. Preoperative examination including otoscopy, nasopharyngeal examination, tympanometry, pure tone audiometry. Sensory nerve deafness, cleft palate, immunosuppression and aminoglycoside-sensitive patients were not included in this study. Seven days before surgery have not used antibiotics. Intraoperative patients were randomly divided into three groups: the first group without gentamicin ear drops, the second group immediately after catheterization once with Gentamicin