The Effects Of Different Inspired Oxygen Concentration On The Pulmonary Collapse And Postoperative Recovery Of Thoracoscopic Surgery

Objective:To investigate the effect of different inhalated oxygen concentrations on the lung collapse and postoperative recovery of thoracoscopic surgery.Methods:The research objects were randomly divided into two groups,group A（n=29）and group B（n=30）.The Group A received a gas mixture of oxygen and air（FiO₂=0.5）,and group B received 100%oxygen（Fi O2=1.0）until the start of one-lung ventilation（OLV）,then the dependent lung was ventilated with 50%oxygen during OLV in both groups.The surgeons evaluated the lung collapse using LCS score and Campos lung collapse scales at 1min after the opening of the pleura（T₀）,10min after the start of OLV（T₁）,20min after the start of OLV（T₂）and 30min after the start of OLV（T₃）.Arterial blood gases were performed before anesthesia induction,during two lung ventilation,and every 10min within 30 min,after initiation of OLV.Recording the incidence of postoperative atelectasis by chest CT at the third day after operation,hospital length of stay（LOS）and the incidence of patchy consolidation.Results:At T₁ and T₂,the LCS scores and Campos scales of group B were higher than group A（P<0.05）,but the differences between the two groups were not obvious at T₀and T₃（P>0.05）.The oxygen partial pressure of group B was higher than that of group A before 20min of OLV（P<0.05）,and the two groups were not significantly different after20 minutes.The incidence of postoperative atelectasis,LOS and the incidence of patchy consolidation were no different（P>0.05）.Conclusion:the inhalation of 100%oxygen before the OLV can make the pulmonary collapse effect better,but it has no effect on postoperative recovery.