The results of simulation indicate that there is a critical value for ventilation direction to transfer sheet cavity into supercavity.
计算结果表明：在通气空泡的形成过程中，通气方向角存在着一个临界值，使得空泡形态由片状空泡过渡到超空泡；
Objective to evaluate the therapeutic effect of high frequency oscillatory ventilation (HFOV) combined with thoracic cavity occlusive drainage on neonatal pneumothorax.
目的评价高频振荡通气(HFOV)并胸腔闭式引流治疗新生儿气胸的疗效。
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