An Eeperiment Study Central Venous Oxygen Saturation for Monitoring Blood Transfusion in Hemorrhagic Shock
SHENG Xiaosheng1 LIN Li1 HE Zhongping2 SHI Da2 ZHANG Hui2
1.Department of Anesthesiology, the People’s Hospital of Jinhua City in Zhejiang Province, Jinhua 321000, China; 2.Animals Laboratory Centers of Jinhua City in Zhejiang Province, Jinhua 321000, China
[Abstract] Objective To study central venous oxygen saturation (ScvO2) in controlled hemorrhagic shock rabbits resuscitation process as a transfusion trigger and traditional transfusion trigger of comparison. Methods Selected New Zealand pure line of rabbit 24 only, simple randomly divided into 3 groups, groups A and B for the observation group, groups C as control group with eight in each. A, B, C three groups respectively by ScvO2≤70%, ScvO2≤75%, hemoglobin (Hb)≥8g/dL as transfusion trigger. From femoral artery bloodletting 10 minute inside, make the MAP to about(40±5)mmHg, and maintain the blood pressure 60 minutes, establish controlled hemorrhagic shock rabbits of animal model. And then started to resuscitate, with colloid and crystalloid infusion according to the proportion 1:2 , infusion rate of about (10-15)mL/(kg·h), according to the blood pressure and heart rate, and proper adjustment according to the different requirements of each group conducted a blood transfusion. Monitoring based value, shock, shock treatment 30 minutes, 60 minutes, 120 minutes, 180 minutes all time points, and various indexes of blood loss, blood transfusions, crystalloid and colloid fluid volume and so on. Results In shock treatment observation group A late blood pressure, pH ,BE, HCO3-, O2ER etc compare with the other three groups have obvious statistical differences(P<0.05), group B and C two groups at the same time points each monitoring index there was no significant differences(P>0.05). The volume of transfusion group C was most, compare with the other three groups there were significant difference(P<0.05), groups A and B infuse colloid fluid, crystal fluid volume than groups C(P<0.05), each group blood loss without significant difference. Conclusion ScvO2 for controlled hemorrhagic shock rabbit resuscitation monitoring can guide controlled hemorrhagic shock rabbit of blood transfusions, according to ScvO2≤75% transfusion with traditional according to Hb or blood loss transfusion trigger comparison, can achieve the same resuscitation effect, and can more accurately and individualized guide transfusion, reduce unnecessary blood transfusions, save resources.
[Key words] Central venous oxygen saturation;Hemoglobin;Hemorrhagic shock;Transfusion trigger
输血是失血性休克救治中的一个重要方面,输血的主要目的就是维持机体的氧供需平衡,大量的输血不但容易传播疾病,也造成了血源的紧张,目前我国无偿献血所能提供的血量只相当于临床需要量的60%。因此严格把握输血适应证,节约有限的血液资源,具有重要意义和预防性。过去在输血指征方面的研究局限在血红蛋白、失血量、血压等方面,近来有学者认为在临床实践中,决定是否要输血与组织的氧输送(TO2)有关,生理学输血指标越来越多地替代了血红蛋白输血指征,其中混合静脉血氧饱和度(SvO2)或者它的替代值中心静脉血氧饱和度(ScvO2),是临床有用的工具[1,6],两者与氧摄取率及氧输送关系密切,可以作为生理学输血指征。因为检测ScvO2较方便,所以本文探索ScvO2作为输血指征和传统输血指征血红蛋白(Hb)在失血性休克动物救治过程中的应用及关系。
1 资料与方法
1.1 实验动物与分组
选择新西兰纯系家兔24只,体重2.5~3.0kg, 随机分为四组,A、B两组为观察组,C组为对照组,每组8只, A、B、C三组分别以中心静脉血氧饱和度(ScvO2)≤70%、 ScvO2≤75%、血红蛋白(Hb)≤8g/dL为输血指征。
1.2 实验方法
所有实验动物用苯巴比妥钠按(120~150)mg/kg腹腔内注射麻醉,麻醉后上腔静脉、股动脉插管,肝素5mg/kg肝素化抗凝。控制性失血性休克模型的建立:从股动脉放血,10min内使MAP降至约(40±5)mmHg,并维持此血压60min,建立失血性休克兔的动物模型。控制性失血性休克复苏方案:模型建立后开始复苏,胶体液和晶体液本按1:2的比例输注,先给予失血量的一半,然后按输注速度为(10~15)mL/(kg·h)补液,根据血压、心率适当调节输注速度,并按照每组的不同要求进行输血。
1.3 监测指标
监测基础值、休克时、休克治疗30、60、120、180min共6个时间点的有创动脉压(MAP)、心率(HR)、动脉血酸碱度(pH)、碱剩余(BE)、碳酸氢根离子(HCO3-)、血红蛋白(Hb)、红细胞压积(Hct)、氧饱和度和ScvO2以及失血量、输血量、输晶体液量、输胶体液量、氧摄取率(O2ER)等。
1.4统计学处理
所有数据都以均数±标准差(χ±s)表示,采用SPSS17.0统计软件作统计处理,组内或组间比较采用方差分析,P<0.05为差异有统计学意义。
2 结果
2.1各组动物一般情况
各组动物体重、雌雄等一般情况无统计学差异。
2.2 各组动物麻醉前、休克及休克复苏后各项指标变化
见表1。其中A组在休克治疗观察后期血压、pH、BE、HCO3-、O2ER等与其他两组比较有统计学差异。B、C两组间则无统计学意义。
2.3 各组动物建立失血性休克兔模型失血量及按不同指标复苏输血输液量
见表2。其中输血量C组最多,与其他两组比较有统计学差异(P<0.05),A、B两组输胶体液、晶体液量明显多于C组(P<0.05),各组失血量无明显统计学差异。 (责任编辑:南粤论文中心)转贴于南粤论文中心: http://www.nylw.net(南粤论文中心__代写代发论文_毕业论文带写_广州职称论文代发_广州论文网)