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【单选题】
男性，42岁。因急性重症胰腺炎并休克、ARDS行机械通气治疗。FiO 2 60%条件下，PaO 2 仍低于60mmHg，现给予正压通气（PEEP）。关于PEEP的设置，正确的是（）
A.
休克者机械通气禁用PEEP
B.
目标是使FiO 2 60%以下，PaO 2 高于60mmHg，压力不限制
C.
根据静态压力-容积曲线选择最佳PEEP
D.
最佳PEEP一般为低位拐点所对应的压力+（3～5）cmH 2 O
E.
逐步增加压力不超过10cmH 2 O，而PaO 2 达到60mmHg
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