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按压 30 次后,施救者将患者头部稍微向后倾斜并抬起下巴,这可使舌头远离以免阻塞气道。然后施救者捏住患者的鼻子,正常吸气一次,然后用嘴包住患者的嘴,向患者的嘴里吹气足够长的时间,以使患者的胸部刚好抬起(约 1 秒)。再次重复此操作,然后立即再进行另一组 30 次按压。