The mechanism of circulation in open-chest cardiac massage in apparently superior to that in closed—chest compression.

开胸心脏按压的血流机制明显优于胸外心脏按压。

New data show that when bystanders without emergency medical training try CPR using only chest compression, the results can be better than if they also attempt mouth-to-mouth.

最新资料显示，当未经训练的路人仅实施心肺复苏（CPR）的胸腔按压部分，好过人工呼吸。

The most common symptoms are chest pain, cough, and dyspnea caused by compression or invasion of contiguous structures.

常见的症状是因为邻近构造被压迫到或被侵犯到，如胸痛、咳嗽、 呼吸急促。