体外静脉—静脉转流下原位肝移植围术期酸碱,生化的变化

目的:观察体外静脉转流下原位肝移植围术期酸碱和生化的变化。方法:7例病人行原位肝移植术,在无肝期行体外静脉-静脉转流,监测围术期酸碱和生化指标。结果:(1)与术前相比,pH各期有所下降,但仍维持在正常范围,BE和SBC在转流60分钟及关腹时降低;与转流前期相比。pH以后各期变化不大。术期pH在7.35～7.45范围之内;(2)血糖在各期都升高,血钙降低,体温逐渐降低;(3)血钾在肝血管开放后一过性增高,由3.17mmol/L升至3.53mmol/L。结论;体外静脉转流下原位肝移植术,术中酸碱和生化变化轻微,避免了明显的代谢性酸中毒和高血钾,但体温和血糖变化明显。     

上腹器官簇移植术实验中血流动力学及血生化的变化

目的:观察上腹器官簇移植术实验中血流动力学及血生化变化。方法:杂种猪32只。随机分为供体组和受体组,无肝期行体外静脉转流。测定术中的血流动力学和血生化指标。结果:(1)术中血流动力学在无肝期初期及开放后早期时间内有明显的波动,心输出量、血压、肺动脉压和肺毛细血管楔压下降,心率加快;(2)转流在一定程度上稳定血流动力学;(3)生化变化:开放前行肝冲洗的8例,血钾仅轻度升高;未作冲洗的6例,则血钾明显升高;(4)开放后均有不同程度的代谢性酸中毒。结论:上腹器官簇移植术,机体血流动力学及血生化均有改变,特别是在肝移植阶段明显。其它器官移植期处理也应考虑肝移植后续作用的影响。     

猪门静脉回流阻断模型内毒素的移位

【目的】拟在猪的肠血管阻断模型中探讨门静脉回流阻断肠淤血可能造成的内毒素移位和肿瘤坏死因子释放。【方法】采用种群相近体质量22～25kg雌性小猪8只，无感染症状。分离门静脉和肝后下腔静脉分别阻断、然后开放各60min．观察血压、心率，阻断前和开放60min各取回肠末端小肠全层行光镜、电镜检查，测定门、颈静脉血内毒素及肿瘤坏死因子（TNF—α）含量。【结果】门静脉和肝后下腔静脉阻断后，肠淤血、水肿，并随时间延长而加重，光镜检查表明实验后肠粘膜和腺体明显损伤，电镜检查表明细胞超微结构轻微异常。阻断前后的血内毒素、TNF—α含量无显著性差异。【结论】①肠静脉回流阻断60min引起的肠道淤血可导致肠粘膜屏障损伤。②在60min内肠淤血性的损伤不会引起肠腔内内毒素的大量移位及TNF—α的释放。     

葛根素对异丙肾上腺素诱导大鼠心肌损伤的保护作用

采用异丙肾上腺素造成大鼠急性心肌缺血模型 ,观察葛根素对大鼠心电图、血清磷酸肌酸激酶 (CPK)、心肌组织超氧化物歧化酶 (SOD)和脂质过氧化物丙二醛 (MDA)的影响。发现葛根素可对抗异丙肾上腺素所致心肌缺血大鼠的心电图ST段的异常升高 ,使血清CPK降低 ,并可增加心肌组织SOD的活力 ,减少MDA生成。提示 :葛根素对大鼠心肌缺血有保护作用     

Secretion of vascular endothelial growth factor/vascular permeability factor from human luteinized granulosa cells is human chorionic gonadotrophin dependent

Vascularization is a prominent event during corpus luteum formation, providing low density lipoproteins for steroid biosynthesis and enabling transport of secreted steroids. The process of vascularization is controlled by specific regulators. Vascular endothelial growth factor (VEGF), otherwise named vascular permeability factor (VPF), induces endothelial cell proliferation as well as angiogenesis in vivo and increases capillary permeability. Here we report the expression of VEGF/VPF mRNA by cultured human luteinized granulosa cells (GC) for at least 10 days. Without HCG VEGF/VPF expression declined after day 4 and by day 10 was reduced to approximately 30% of the value at day 4. However, after culture in the presence of 1 U/ml human chorionic gonadotrophin (HCG), expression of VEGF/VPF mRNA by GC was four times greater than control experiments by day 10, and increased 100% from day 4 to day 10. Simultaneously, HCG supplementation increased VEGF/VPF secretion by GC. Medium VEGF/VPF on day 3 was 13 pM without and 11 pM with HCG. Medium VEGF/VPF on day 10 was 6 pM without HCG and 29 pM with HCG. These results suggest that vascularization of the corpus luteum is induced by HCG-mediated effects of VEGF/VPF.