Establishment of a new pig model for auxiliary partial orthotopic liver transplantation

AIM: To establish a new pig model for auxiliary partial orthotopic liver transplantation (APOLT).METHODS: The liver of the donor was removed from its body. The left lobe of the liver was resected in vivo and the right lobe was used as a graft. After the left lateral lobe of the recipient was resected, end-to-side anastomoses of suprahepatic inferior vena cava and portal vein were performed between the donor and recipient livers,respectively. End-to-end anastomoses were made between hepatic artery of graft and splenic artery of the host.Outside drainage was placed in donor common bile duct.RESULTS: Models of APOLT were established in 5 pigs with a success rate of 80%. Color ultrasound examination showed an increase of blood flow of graft on 5th d compared to the first day after operation. When animals were killed on the 5th d after operation, thrombosis of hepatic vein (HV) and portal vein (PV) were not found. Histopathological examination of liver samples revealed evidence of damage with mild steatosis and sporadic necrotic hepatocytes and focal hepatic lobules structure disorganized in graft. Infiltration of inflammatory cells was mild in portal or central vein area. Hematologic laboratory values and blood chemical findings revealed that compared with group A (before transplantation), mean arterial pressure (MAP), central venous pressure (CVP), buffer base (BB), standard bicarbonate (SB) and K+ in group B (after portal vein was clamped) decreased (P＜0.01). After reperfusion of the graft, MAP, CVP and K+ restored gradually.CONCLUSION: Significant decrease of congestion in portal vein and shortened blocking time were obtained because of the application of in vitro veno-venous bypass during complete vascular clamping. This new procedure,with such advantages as simple vessel processing, quality anastomosis, less postoperative hemorrhage and higher success rate, effectively prevents ischemia reperfusion injury of the host liver and deserves to be spread.

猪辅助性部分肝移植模型制作及比较

目的建立猪的辅助性部分肝移植模型,观察其肝功能和术中血流动力学变化。方法 24头健康良种家猪,体质量23-30 kg,被随机分为供体(n=12)和受体(n=12)。气管插管+全麻,硫喷妥钠静脉维持。移植前切除受体肝左叶,供肝右叶作为植入肝。预实验2例行经体位转流的原位辅助性部分肝移植,对照组(5例)行简易转流下的原位辅助性部分肝移植。模型组(5例)行异位辅助性部分肝移植, 供肝被植入受体肝下间隙,供肝肝上下腔静脉与受体肝下下腔静脉端侧吻合,供肝门静脉与受体门静脉行端侧吻合,供肝肝动脉与受体脾动脉行端端吻合。供肝胆总管置管外引流。结果预实验中行体位静脉转流的原位辅助性部分肝移植的2例受体在肝上下腔静脉阻断后很快陷入血流动力学紊乱死亡。5例行简易静脉转流的原位辅助性部分肝移植的受体,2例在24 h内死亡,1例28 h,2侧超过48 h。而模型组受体 5例中有4例存活超过24 h。AST,ALT指标手术开始至术后24 h呈持续升高。模型组术中血流动力学较其他组稳定。结论该辅助性肝移植模型简明易建且具有不需静脉转流等优点,为研究辅助性部分肝移植原肝和供肝功能及血流变化提供了理想的平台。

猪原位辅助性部分肝移植术中血流动力学变化的实验研究

目的:建立一种新的猪辅助性部分原位肝移植模型,并对其血流动力学变化进行观察。方法:选用健康良种幼猪16只,随机配成8对,基础麻醉加气管插管静脉复合麻醉。手术方法:切去供肝左叶,将留存之右叶供肝作移植肝。切除受体之肝左外叶,将右叶供肝肝上、下腔静脉与受肝肝上、下腔静脉行端侧吻合,供肝门静脉与受肝门静脉行端侧吻合,受体脾动脉在结肠后与供体肝动脉行端端吻合,胆总管置管外引流。术中热缺血时间为0min,冷缺血时间为(58±4.0)min。切肝前10min、全肝阻断后10min、供肝植入开放门静脉后10min分别取血检测电解质和全血缓冲碱(BB)及标准碳酸氢根浓度(SB),并观察各个时期的心率(HR)、平均动脉压(MAP)和中心静脉压(CVP)。术后常规处理,未用抗排斥药。部分存活猪在术后5d彩超观察门静脉血流,同时行病理切片检查。结果用均数±标准差表示,采用方差分析和q检验。结果:手术成功率87.5%。术中、术后血流动力学和生化指标均告平稳。术后5d,部分猪彩超结果显示门静脉无血栓形成,仅见移植肝断面有少量包裹性积液,移植肝门静脉最大流速为42.2cm/s,受体肝及移植肝门静脉血流均告通畅。活杀大体及病理切片观察,移植肝形态色泽正常,各吻合口无扭曲、漏血和血栓形成,门静脉无血栓形成。术后5d。

猪改良辅助性部分原位肝移植动物模型建立及麻醉处理

目的探讨猪辅助性部分原位肝移植模型建立及其术中麻醉处理特点。方法选10头健康3月龄猪,在气管插管全麻下进行静脉-静脉转流,建立辅助性部分原位肝移植模型;经颈内动、静脉置管监测ABP、CVP;于无肝期、再灌注期抽取血气、血生化,观察血流动力学、内环境变化。结果实验5例,成活4例;无肝期、再灌注期血流动力学波动明显,并伴有代酸;再灌注期血钾升高明显,体温下降明显。结论(1)本模型成功率高,可为临床应用提供理论依据,值得推广;(2)即使在良好的静脉转流下,无肝期、再灌注期血流动力学、内环境变化仍明显。

新辅助性原位部分肝移植动物模型的建立

目的 建立一种新的猪辅助性部分原位肝移植模型。方法 将供肝左叶在体外修肝时切除 ,右叶供肝作为移植肝。切除受肝左外叶 ,右叶供肝肝上下腔静脉与受肝肝上下腔静脉行端侧吻合 ,供肝门静脉与受肝门静脉行端侧吻合 ,受体脾动脉在结肠后与供体肝动脉端端吻合 ,胆总管置管外引流。结果 共进行移植模型 5例 ,成功 4例 ,成功率达 80 % ,模型血流动力学稳定。结论 本移植术式在体外转流下行全肝血流阻断 ,门静脉淤血明显减轻 ,阻断时间缩短 ,可以有效防止受体肝的缺血再灌注损伤。血管处理简单 ,吻合质量高。术后出血少。成功率高 。