Objective To dynamically observe the changes of the plasma superoxide dismutase(SOD) activity and malondialde-hyde(MDA) content of rabbits with hemorrhagic shock in high latitude .Methods 28 rabbits were randomly divided into 4 groups :0 .9% NaCl group ,7 .5% NaCl group ,Voluven(6% HES 130/0 .4) group and control group .The plasma SOD activity and MDA content were measured before shock .At 30 minutes of shock and 30 minutes later of volumetric resuscitation .Then the changes of MAP were observed .Results There were no static difference among 4 groups in the levels of SOD and MDA before shock ;at 30 minutes of shock ,the SOD activity was reduced signicantly and the MDA content was increased in each group (P<0 .01) .Afer fluid infusion there were no obvious change in the plasma levels of SOD and MDA compared with those of shock in 0 .9% NaCl group and in 7 .5% NaCl group(P>0 .05) ,whereas in Voluven group ,compared with those in 0 .9% NaCl and 7 .5% NaCl group the SOD activity was elevated signicantly and the MDA content was decreased (P<0 .01) .Conclusion Voluven can be used in scan-venging oxygen free redicals by recovering the plasma SOD activity in rabbits with hemorrhagic shock in high latitude .

Objective To compare the clinical effect and safety of limited fluid resuscitation and aggressive/normotensive fluid resuscitation in treatment of earthquake-induced traumatic hemorrhagic shock patients so as to provide reference for clinical application.Methods A total of 62 patients with traumatic hemorrhagic shock in earthquake were employed and divided randomly into limited fluid resuscitation group(Group Ⅰ,30 patients)and aggressive/normotensive fluid resuscitation group(Group Ⅱ,32 patients).All the patients were resuscitated by using halanted solution and HAES-steril as resuscitanaid resuscitation.Then,surgical hemostasis was carried out and dynamic changes of mean blood pressure(MAP),heart rate and central venous pressure(CVP)observed.The base excess,lactic acid and creatinine were detected at four resuscitation points.Results Before full fluid resuscitation,MAP remained at 50-70 mm Hg and 70-90 mm Hg respectively in both groups.After early resuscitation.heart rate showed significant decrease,while CVP increased(P＜0.01)but still changed at normal range.Total transfusion volume in Group Ⅰ was less than that of GroupⅡ(P＜0.01).There was no statistical difference upon urine volume(P＞0.05).There was statistical difierence upon base excess value after resuscitation within group(P＜0.01)but no statistical difference between two groups(P＞0.05).After resuscitation,hetic acid level wag obviously reduced in both groups(P＜0.01),with more significant change in Group Ⅰ,with statistical difference compared with Group Ⅱ(P＜0.01).There showed a significant decrease of creatinine in both groups after resuscitation.with statistical difierence within group (P＜0.01)but without statistical difference between two groups(P＞0.05).Conclusions Compared with aggressive/normotensive fluid resuscitation,limited fluid resuscitation is a more safe and effective way for fluid resuscitation of traumatic hemorrhagic shock,for it can not only reduce transfusion volume and ameliorate hemodynamic indices,but also can increase oxygen supply,improve microcirculation and protect renal function.