Whether hypoxic radiotherapy can reduce the rate of the sequela such as the difficulty in opening mouth and radiation induced-encephalopathy is difficult to deduce.

低氧放疗能否降低鼻咽癌患者放射性脑病及严重张口困难等后遗症的发生率，尚难以推断。

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Objective to observe the preventive effectiveness of early rehabilitation training to difficulty in opening mouth following radical radiotherapy in the patients with nasopharyngeal carcinoma.

目的探讨早期康复训练对鼻咽癌病人接受根治性放射治疗后张口困难的防治效果。

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