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食管癌放射治疗中常常发生放射性食管炎，其症状主要为咽下部疼痛，严重时影响治疗的正常进行。吸入低氧能保护放射治疗区域的正常组织，同时相应提高肿瘤组织的放射治疗剂量，由此推断可提高局控率。作者就此做了如下临床研究。１ 材料与方法 自１９９０年１２月至１９９
Radioactive esophagitis often occurs in esophageal cancer radiation therapy, and its symptoms are mainly pain in the hypopharynx, and severely affect the normal treatment. Inhalation of hypoxia can protect normal tissues in the radiation treatment area, and at the same time, increase the radiation therapy dose of tumor tissue, which infers that the local control rate can be increased. The author has done the following clinical studies in this regard. 1 Materials and Methods Since December 1990 to 199