Study On The Correlation Between Body Mass Index(BMI)and Postoperative Respiratory Function In Patients Undergoing Thoracoscopic Surgery

Objective: By means of retrospective cohort study of the changes of FEV₁,MVV and PaO₂ before and after operation,this study is to indirectly compare the effects of different body mass index?BMI?on the early respiratory function of patients after pulmonary lobectomy of Video-assisted?thoracoscopic?surgery?VATS?.Exploring the role of BMI in the perioperative period of patients will provide theoretical guidance for whether it is necessary for patients who will undergo elective thoracoscopic surgery to control their preoperative weight.Methods: According to the test method of retrospective cohort analysis and the criteria of exclusion and inclusion,the study take 87 patients as research subjects who were hospitalized and underwent the single lobectomy of VATS in thoracic & cardiovascular surgery department in the Affiliated Tumor Hospital of Qinghai University from January 2018 to August 2019.Calculating the BMI value of patients by combining with the Asian standard of the World Health Organization?who?,the author of this paper divides the participants into low BMI group?BMI < 18.5?,normal BMI group?18.5 ? BMI < 24.9?,high BMI group?25 ? BMI?.The age,gender,lobes to be excised and other general data of patients are compared,as well as the influencing factors of ventilatory function in patients after operation,such as operation time,intraoperative blood loss,FEV₁,MVV and PaO₂ before and after operation,etc.SPSS 19.0 statistical software was used to complete the statistical analysis of the three groups of data,P < 0.05 as the test standard.Result:1.General situation comparison: in terms of gender,P=0.412,the differences are not statistically significant?P > 0.05?;in terms of age,P=0.312,the differences are not statistically significant?P > 0.05?;in terms of lung lobe grouping,P=0.738,the differences are not statistically significant?P > 0.05?.2.Perioperative situation comparison: in terms of operation time of the three groups of patients,P=0.525,the differences are not statistically significant?P>0.05?;in terms of intraoperative blood loss,P=0.507,the differences are not statistically significant?P>0.05?;in terms of preoperative respiratory function,FEV??P=0.045?,MVV?P=0.001?and PaO₂?P=0.014?,the differences are statistically significant?P<0.05?;in terms of postoperative respiratory function,FEV??P<0.001?,MVV?P<0.001?,PaO₂?P<0.001?,the differences are statistically significant?P<0.05?;in terms of the changes of respiratory function before and after operation,in low BMI group,FEV₁?P<0.001?,MVV?P < 0.001?,PaO₂?P < 0.001?,the differences are statistically significant?P < 0.05?;in the normal BMI group,FEV₁?P = 0.042?,MVV?P < 0.001?,PaO₂?P = 0.032?,the differences are statistically significant?P < 0.05?;in high BMI group,FEV₁?P < 0.001?,MVV?P < 0.001?,PaO??P < 0.001?,differences are statistically significant?P < 0.05?;in terms of the degree of postoperative respiratory function changes in three groups,FEV₁?P = 0.043?,MVV?P = 0.049?,PaO₂?P = 0.008?,the differences are statistically significant?P < 0.05?.At the same time,LSD is used to conduct the pairwise comparison between the three indices FEV₁,MVV and PaO₂.The results suggest that the differences are significant between low BMI group and normal BMI group,and the differences are significant between normal BMI group and high BMI group,but the differences are not significant between low BMI group and high BMI group.Conclusion:?Both before and after surgery,the respiratory function of the normal BMI group is better than that of the other two groups;?Compared with that before surgery,the changes of respiratory function in normal BMI group are less than those in the other two groups;?Compared with that before surgery,there is no significant difference in the range of change of respiratory function between the low BMI group and the high BMI group.Therefore,BMI intervention before surgery will be more beneficial to the recovery of early postoperative respiratory function,thus,improving the early postoperative quality of life and prognosis.