A 15-year-old boy is brought to his pediatrician because he feels short of breath and has to stop and walk after brief runs. He underwent cardiac surgery when he was an infant for a congenital heart defect. An inspiratory chest x-ray shows an intact right hemidiaphragm that is much higher than the left one. This boy’s exertional dyspnea is probably caused by which of the following conditions?
一个15岁的男孩被带到他的儿科医生那里，因为他感觉呼吸急促，在短暂的跑步后不得不停下来走一走。他在婴儿时期因先天性心脏病接受了心脏手术。吸气型胸部x线片显示右膈肌完整，远高于左膈肌。这个男孩的活动性呼吸困难可能是由下列哪一种情况引起的?
(A) Damaged left phrenic nerve 左侧膈神经损伤
(B) Damaged right phrenic nerve 右侧膈神经损伤
(C) Eisenmenger syndrome 艾森曼格综合征
(D) Left diaphragmatic hernia 左侧膈疝
(E) Right diaphragmatic hernia 右侧膈疝
答案解析：
胸部x线片显示该男孩右侧膈肌麻痹。由于膈神经是沿心包走行的，因此在心脏手术中膈神经有可能受到损伤。病人在开始长跑之前没有症状是很常见的。
正确答案：B
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