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单侧多根多处肋骨骨折最严重的生理改变是()

单选题
2021-09-10 03:13
A、疼痛,呼吸运动减弱
B、胸壁软化,反常呼吸
C、咳嗽,血痰
D、严重皮下气肿
E、出血,休克
查看答案

正确答案
B

试题解析
多根多处肋骨骨折将使局部胸壁失去完整肋骨支撑而软化,出现反常呼吸运动,即吸气时软化区胸壁内陷,呼气时外突,又称为连枷胸。连枷胸的反常呼吸可使伤侧肺受到塌陷胸壁的压迫,呼吸时两侧胸腔压力的不均衡造成纵隔扑动,影响肺通气,导致体内缺氧和二氧化碳滞留,严重时可发生呼吸和循环衰竭,连枷胸常伴有广泛肺挫伤、挫伤区域的肺间质或肺泡水肿导致氧弥散障碍,出现低氧血症。

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