Comparison of respiratory function between the two groups. A. Before nursing, there was no notable difference between the two groups in PaCO2, while after nursing, PaCO2 of both groups decreased significantly, and PaCO2 of the research group was significantly lower than that of the control group. B. Before nursing, there was no notable difference between the two groups in PaO2, while after nursing, PaO2 of both groups increased significantly, and PaO2 of the research group was significantly higher than that of the control group. C. Before nursing, there was no notable difference between the two groups in SaO2, while after nursing, SaO2 of both groups increased significantly, and SaO2 of the research group was significantly higher than that of the control group. Note: *** indicates P<0.001.