MICROCOMPUTER DATA PROCESSING OF HEMODYNAMIC EFFECTS OF A CARDIOTOXIC FRACTION(Fr.19-2) FROM THE SOUTHERN CHINESE COBRA(NAJA NAJA ATRA CANTOR)IN ANESTHETIZED CATS

A new program of microcomputer data processing was developed on AppleIIe computer on-line with 8-ch polygraph in the study of hemodynamic effects of a cardiotoxic fraction (Fr. 19-2) from the southern Chinese cobra (Naja naja atra Cantor). In anesthetized open-chest cats, Fr. 19-2 caused a dose-related decrease in various indices of myocardial contractility and pumping function such as dp/dt_(max), V_(CE-DP40), V_(CE-CPIP),V_(pm), CO, CI, SV, SI, LVW, LVWI, LVSW and LVSWI. It reduced the heart rate without other cardiac arrhythmias. A marked decrease in -dp/dt_(max) (219.7±23.5 vs 110.5±29.1kPa/s, P<0.01) and an increase in time constant of the fall of left ventricular pressure during isovolumetric relaxation (T) was induced. LVEDP rised till the dose of Fr. 19-2 reached 0.4mg/kg. It is concluded that this cardiotoxic fraction predominantly inhibits the hemodynamic indices and myocardial performance. With the new microcomputer data real-time processing system, 33 elaborated hemodynamic indices were ca     

Protective effects of amiloride on the ischemic reperfused rat heart. Relation to mitochondrial function.

We examined the effect of amiloride on mechanical, electrical and mitochondrial function as well as ultrastructural integrity, in isolated rat hearts subjected to 30 min low-flow ischemia and 30 min reperfusion. In control hearts, ischemia produced a rapid loss of contractility and a concomitant elevation in resting tension which were associated with a 100% incidence in arrhythmic activity. Reperfusion produced a 22 and 54% recovery in force and rate of force (dF/dt) development, respectively. In control hearts the incidence of arrhythmias was 100% within 5 min of reperfusion which then declined to 50% by 30 min. Ultrastructural defects in these hearts were restricted primarily to mitochondrial damage. Amiloride significantly attenuated the elevation in resting tension at the end of ischemia. Postischemic recovery was significantly increased to 38 and 86% for force and dF/dt, respectively and the incidence of arrhythmias was reduced to 30%. No ultrastructural defects were ever observed in amiloride-treated reperfused hearts. Both interfibrillar and subsarcolemmal mitochondria exhibited depressed respiratory function and adenine nucleotide translocase activity. Although virtually all parameters tended to be elevated in mitochondria isolated from amiloride-treated hearts, a significant increase was seen in only one case. Our results therefore demonstrate an ability of amiloride to enhance postischemic contractile recovery and reduce the incidence of arrhythmias, particularly during reperfusion, an effect associated with virtual total prevention of ultrastructural defects. Although the salutary effect was not significantly correlated to improved mitochondrial function, this dissociation may have been due to removal of damaged mitochondria during the isolation process, in view of diminished mitochondrial damage as viewed by transmission electron microscopy.(ABSTRACT TRUNCATED AT 250 WORDS)     

头部X线照射后大鼠血清中皮质酮含量和脾细胞中糖皮质激素受体变化及其相互关系的研究

给Wistar大鼠以10Gy X射线头部照射后不同时间测定血清皮质酮含量和脾细胞中糖皮质激素受体,结果表明:头照后24h受体数已降到对照组的25％,以后逐渐回升,至第9天恢复到接近正常水平。头照后受体的最大结合容量有降低趋势,但差异不显著,而Kd值显著增大,亲和力降低。皮质酮含量的变化呈双峰曲线,第1天即显著增高,至第9天仍显著增高,皮质酮含量和受体的变化规律不一致。体外实验还证实了1～10倍血清浓度的皮质酮在短时间内不会引起所测定的GCR改变。证明皮质酮的变化虽然可能是引起受体变化的一个原因,但不是主要原因。     

SD大鼠肺中降钙素基因相关肽的分布及缺氧对其含量的影响

本研究用免疫细胞化学方法(ABC法)观察了降钙素基因相关肽(CGRP)在SD大鼠肺中的分布,缺氧对肺中神经内分泌细胞内CGRP含餐的影响。结果表明:含CGRP的神经纤维分布在肺血管平滑肌层中及其周围、气管-支气管树的粘膜下层;含CGRP的神经内分泌细胞位于气管一支气管树的上皮层、粘液腺中和肺实质内。缺氧不引起火鼠肺的神经内分泌细胞数目改变,但可使这些细胞内的CGRP含量增加。     

抗HBV药物对小鼠早期胚胎发育的影响

目的　观察拉米夫定 (3TC)和干扰素 (IFNα) 2种抗乙型肝炎病毒 (HBV)药物对早期胚胎发育的影响 ,探讨妊娠早期用药的可能性。方法　收集昆明种小鼠的单细胞受精卵 ,采用微滴培养法连续培养 72h ,观察不同浓度3TC和IFNα对胚胎发育的影响 ,以胚胎发育到各期的比例为判断发育效果的标准。结果　当IFNα浓度高达 1 0 0 0u/m ;3TC 50 0 μmol/L时 ,胚胎发育率呈下降趋势 ,尤其是培养液中 3TC浓度达 50 0 μmol/L时 ,发育至 4 -细胞、8-细胞及桑椹胚期的胚胎数明显减少 (P <0 .0 5) ,但在IFNα浓度 <50 0U/ml;3TC <30 0 μmol/L时 ,对小鼠早期胚胎发育基本无抑制作用。结论　在正常治疗剂量下 ,IFNα和 3TC对早期胚胎发育无影响     

肝移植术后肝动脉血栓形成的治疗方法探讨

目的探讨肝移植术后肝动脉血栓形成的治疗方法。方法回顾性分析我院自2001年11月至2005年1月收治肝移植术后肝动脉血栓形成患者14例,分别采用动脉溶栓、血管支架植入、高压氧治疗及再次肝移植治疗。结果动脉溶栓11例,成功率45.5%(5/11),2例随访12个月肝功能正常,另3例均于随访期死亡,其中2例因吻合口狭窄曾行血管支架植入术。高压氧治疗3例,随访7个月,临床效果较好。急诊再次肝移植2例,术后均死于多器官功能衰竭。结论肝移植术后肝动脉血栓形成,动脉溶栓及血管支架植入治疗存在局限性,高压氧治疗效果良好,可与其他保守治疗联合使用,应避免急诊再次肝移植。     

阿昔洛韦片剂和胶囊在人体的生物利用度

10名男性受试者按交叉实验设计口服阿昔洛韦片剂和胶囊各400 mg 后,用改良的 HPLC 测定血药浓度,计算表明阿昔洛韦胶囊口服后吸收快于片剂,峰浓度也较高,但吸收程度(AUC_(0-12h))相似。     

应用多普勒组织成像评价肥厚型心肌病左室收缩功能

目的 :应用多普勒组织成像脉冲速度模式测量二尖瓣环收缩速度 ,以评价肥厚型心肌病患者左室收缩功能的改变。材料和方法 :对肥厚型心肌病及正常人分别测量二尖瓣环各点收缩期峰值速度。结果 :肥厚型心肌病患者与正常组二尖瓣环收缩期峰值速度有显著性差异 ,均较正常组减低。结论 :肥厚型心肌病患者左室长轴收缩功能减低。     

利多卡因对缺氧/复氧后肝细胞Bcl-2、Caspase-3蛋白表达及细胞凋亡的影响

目的探讨利多卡因预处理对肝细胞缺氧/复氧后Bcl-2、Caspase-3蛋白表达及细胞凋亡的影响。方法将体外培养的肝细胞分为三组:缺氧/复氧组(Ⅰ组)、利多卡因预处理组(Ⅱ组)和正常对照组(Ⅲ组),每组10份。检测肝细胞缺氧/复氧培养后细胞培养液中谷丙转氨酶(ALT)、谷草转氨酶(AST)浓度,肝细胞Bcl-2、Caspase-3蛋白表达、肝细胞凋亡率及超微结构变化。结果Ⅰ、Ⅱ组细胞培养液中ALT、AST浓度、肝细胞Caspase-3蛋白表达和肝细胞凋亡率较Ⅲ组均升高(P<0.05),透射电镜示肝细胞损伤,可见凋亡细胞;Ⅱ组细胞复氧后培养液中ALT、AST浓度、肝细胞Caspase-3蛋白表达和细胞凋亡率均低于Ⅰ组(P<0.05),而肝细胞Bcl-2蛋白表达较Ⅰ组升高(P<0.05),透射电镜观察也显示Ⅱ组肝细胞比Ⅰ组损伤轻微。结论利多卡因预处理可以在一定程度上减轻缺氧/复氧后肝细胞损伤,降低细胞凋亡率,保护机制可能与Bcl-2、Caspase-3蛋白表达有关。