患者男．30岁。因甲状腺功能亢进行甲状腺大部切除术。术后护士观察到患者音调低

问题：

A . 喉上神经内侧支
B . 喉上神经外侧支
C . 单侧喉返神经
D . 经喉头水肿
E . 声带损伤

参考答案：B

参考解析：

喉上神经外侧支损伤会使环甲肌瘫痪，引起声带松弛，音调降低，内侧支损伤则是喉部黏膜感觉丧失，容易出现误咽，呛咳。

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