4个还是5个？

When neither high Pplat nor high PEEP are present, ACP does not appear to increase mortality risk in ARDS.Nonetheless, severe ACP carries significantly higher mortality in ARDS than its absence (57% vs. 42%, P = 0.03).Severe ACP was one of four factors independently associated with mortality in ARDS, the others being: PaO2/FIO2 < 150 mmHg, PDR > 18 cmH2O, arterial carbon dioxide tension (PaCO2) > 48 mmHg, and pneumonia as primary etiology.

当Pplat和PEEP都不高时，ACP（急性肺心病）似乎不会增加ARDS的死亡风险。尽管如此，ARDS时，重度ACP的死亡率显著高于无ARDS时的死亡率(57%比42%，P=0.03)。重症ACP是与ARDS死亡率独立相关的四因素之一，其他因素是：PaO₂/FIO₂<150mmHg，P_DR>18cmH₂O，动脉二氧化碳分压(PaCO2)>48mmHg，肺炎为主要病因。

怎么数下来是5个，把ACP以为是肺炎了？