Abstract: Objective To investigate the application of intraoperative blood salvage combined with reinfusion of postoperative drainage in lumbar spine surgery. Methods 115 cases of lumbar spine surgery were divided into two groups：control group （73 cases） and observation group （42 cases）.The control group received intraoperative blood salvage,and the observation group received intraoperative blood salvage combined with reinfusion of postoperative drainage.Hemoglobin concentration was monitored respectively 1 day before surgery,3 days and 7 days after surgery.All patients were recorded for intraoperative blood loss,intraoperative return volume,and allogeneic blood transfusion.The observation group was also recorded in postoperative drainage volume and postoperative return volume.The number of allogeneic blood transfusion during operation and postoperative was statistically analyzed. Results The amount of blood transfusion in observation group was lower than that in control group （P<0.05）.There was no significant difference in blood loss,intraoperative return volume,the number of allogeneic blood transfusion,hemoglobin concentration before and after operation （P>0.05）. Conclusion Intraoperative blood salvage combined with reinfusion of postoperative drainage can significantly reduce the amount of allogeneic blood transfusion,but can not reduce the number of allogeneic blood transfusion.

Key words: Intraoperative autotransfusion, Reinfusion of postoperative drainage, Lumbar spine surgery, Application