Objective To investigate the effect of preoperative single target administrating of fibrinogen(FIB)on the intraop-erative bleeding and coagulation function in posterior lumbar interbody fusion (PLIF)operation.Methods 60 cases of lumbar inter-vertebral disc herniation(LDH)undergoing elective PLIF operation were divided into two groups according to the preoperative FIB levels:normal control group(NC,FIB≥3.0 g/L,n=20)and low FIB group(FIB<3.0 g/L,n=40).The low FIB group was ran-domly re-divided into 2 groups:the low HIB control group(LC,n=20)and the preoperative single FIB administrating group(PF, n=20).After anesthesia induction,the PF group was given FIB;the LC and NC groups were given the same volume of saline solu-tion as solvent volume required by administrating FIB dose.The change of blood coagulation 4 indexes were detected and the activa-ted clotting time(ACT),coagulation time(CR)and platelet function(PF)were detected by the sonoclot analyzer before and after drug administrating.The bleeding amount was weighed after ending operation.Results The FIB concentration after administrating in the PF group was (3.75±0.23)g/L,which was significantly higher than (2.62±0.33)g/L in the NC group and (2.23±0.22) g/L in the LC group,the differences among 3 groups were statistically significant(P <0.05);the CR value after administrating in the PF group was (21.42±7.15)U/min,which was higher than (18.21±5.62)U/min in the NC group and (15.21±5.63)U/min in the LC group.The bleeding amount in the PF group was (516.74±135.53)g,which was lower than (660.71±119.34)g in the NC group and (726.72±160.47)g in the LC group,the difference among 3 groups had statistical significance(P <0.05).Conclusion Preoperative single target administrating of fibrinogen can effectively increase the FIB level,improve the blood coagulation func-tion and reduce the periaoperative bleeding amount.

Objective:To evaluate the role of ferroptosis in lung injury in a rat model of autologous orthotopic liver transplantation.Methods:Twenty-four healthy adult SPF-grade male rats, aged 8-10 weeks, weighing 230-270 g, were divided into 3 groups ( n=8 each) using the random number table method: sham operation group (S group), autologous in situ liver transplantation group (LT group) and ferroptosis inhibitor Ferrostain-1 group (LT+ Fer-1 group). In LT group and LT+ Fer-1 group, an autologous in situ liver transplantation model was developed in anesthetized animals, and Ferrostain-1 5 mg/kg was intraperitoneally injected at 30 min before surgery in LT+ Fer-1 group. The inferior vena cava blood samples were obtained at 6 h of reperfusion, then animals were sacrificed, and lung tissues were obtained. The morphology of lung tissues was examined, and the lung injury was scored. The serum malondialdehyde (MDA) concentration and contents of MDA, reduced glutathione (GSH), glutathione peroxidase4 (GPX4), and Fe 2+ in lung tissues were measured by enzyme-linked immunosorbent assay. The expression of ferritin heavy chain 1 (FTH1) and solute carrier family 7 member 11 recombinant protein (SLC7A11) was determined by Western blot. Results:Compared with S group, the lung injury, serum MDA concentration, and contents of MDA and Fe 2+ were significantly increased, the contents of GSH and GPX4 were decreased, and the expression of FTH1 and SLC7A11 was down-regulated in LT group ( P<0.05). Compared with LT group, the lung injury, serum MDA concentration, and contents of MDA and Fe 2+ were significantly decreased, the contents of GSH and GPX4 were increased, and the expression of FTH1 and SLC7A11 was up-regulated in LT+ Fer-1 group ( P< 0.05). Conclusions:Ferroptosis is involved in the pathophysiology of lung injury in a rat model of autologous orthotopic liver transplantation.