- The rate PaO2/FiO2 of 'intervention' group after is higher than before mobilizing alveolus, in detail: after mobilizing alveolus 5 minutes (397.27 ± 26.9 mmHg comparing with 358.7 ± 17.88 mmHg; p < 0.01); before finishing breathing machine (369.47 ± 20.0 mmHg comparing with 358.7 ± 17.88 mmHg; p < 0.05); after taking out internal breathing pipes (373.8 ± 22.47 mmHg comparing with 358.7 ± 17.88 mmHg; p < 0.05).