单选题不需要抽气治疗，可自行吸收的单纯性气胸是指肺萎陷程度小于（）A＜20%B＜25%C＜30%D＜35%E＜50%
单选题
不需要抽气治疗，可自行吸收的单纯性气胸是指肺萎陷程度小于（）
A
＜20%
B
＜25%
C
＜30%
D
＜35%
E
＜50%
参考解析
解析：
该题是考查气胸的处理原则：①闭合性气胸，肺压缩＜20%者，即可自行吸收，肺压缩＞20%症状明显者应胸腔穿刺抽气1次／1～2天，每次600～800ml为宜；②开放性气胸或呼吸困难明显、不稳定性气胸、肺压缩程度严重的患者，应用胸腔闲式引流排气，肺仍不能复张者，可加用负压持续吸引；③张力性气胸，病情较危急须尽快排气减压，同时准备立即行胸腔闭式引流或负压持续吸引。
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