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当前学科:儿科住院医师
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5岁男孩,出生后6个月开始出现唇周及肢端发绀,胸骨左缘第3肋间闻及Ⅲ级收缩期杂音。X线示肺野缺血,心外形呈靴形。心电图示右心室肥大。股动脉血氧饱和度为0.85。该病例曾发生2次昏厥,其发生昏厥的主要原因是()
A
右心室肥厚
B
肺动脉漏斗部痉挛
C
主动脉骑跨
D
血液黏稠致脑栓塞
E
室间隔缺损太大
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