53 mmHg), p < 0.05; the PaO2/FiO2 value in the LRM group (480.35 ± 34.64 mmHg) was higher than that in the control group (417.30 ± 16.86 mmHg), p < 0.05; SpO2 in the LRM group (98.22 ± 1.31%) was higher than that in the control group (97.10 ± 1.88%), p < 0.05.