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自1928年 Flagg 及1935年 Blaikley 首先推荐插管和正压通气以来,一种基于推理和假定而主要不是基于临床检验的复苏模式已有了进展,但却很少得到应有的评估。出生时肺膨胀的生理学测定在无充分对照的临床试验时,一种符合逻辑的方法是评定一名健康婴儿如何膨胀其双肺及如何开始规律性自发呼吸。Karlberg 等报道11名婴儿开始呼吸时,其中5名婴儿产生40～80cmH_2O 的吸气压,并伴有一种模式提示空气进入肺之前初压至少超过20cmH_2O,即所谓开放压;但其余6名以相当低的压力膨胀其肺,且无任何开放压现象。在诺丁罕的一个相似研究中结果稍有不同,平均吸气压仅22.7cmH_2O,很少见到开放压大于10cmH_2O,
Since Flagg in 1928 and Blaikley in 1935 first recommended intubation and positive pressure ventilation, a mode of recovery based primarily on reasoning and presumptions that is largely based on clinical testing has progressed but has rarely been properly evaluated. Physiological Assay of Lung Expansion at Birth In a well-controlled clinical trial, a logical approach is to assess how a healthy infant inflates its lungs and how to begin regular spontaneous respiration. Karlberg et al. Reported that when infants started to breathe, 11 of the 5 infants developed an inhalation pressure of 40-80 cmH 2 O with a pattern suggesting an initial pressure of at least 20 cmH 2 O before air entering the lung, the so-called open pressure; however, the remaining 6 were equivalent Low pressure inflates its lungs without any open pressure. In a similar study to Nottingham, the results were slightly different with an average inspiratory pressure of only 22.7 cm H 2 O and seldom seen an open pressure greater than 10 cm H 2 O,