人工心脏瓣膜疲劳寿命仪无菌环境维持

人工心脏瓣膜疲劳寿命测试仪是测试生物瓣膜疲劳寿命的一种标准方法.它是一个开放体系,病原微生物容易繁殖而导致瓣膜受损,从而影响试验结果的真实性.     

不同试剂脱除猪胸主动脉壁细胞的对比研究

目的:用不同方法去除猪胸主动脉壁细胞,并比较去细胞效果,为组织工程瓣膜或带瓣管道提供良好的实验材料。方法:采用十二烷基硫酸钠、胆脂酸钠、曲拉通（TritonX100）制备猪胸主动脉脱细胞基质。将实验分为十二烷基硫酸钠组、胆脂酸钠、曲拉通组和空白对照组。标本进行大体、光镜、电镜观察,力学性能的检测并做比较。结果:胆脂酸钠无法完全脱除主动脉壁内细胞,十二烷基硫酸钠和曲拉通都能完全脱除猪胸主动脉细胞,曲拉通较好地保持了胶原纤维和弹性纤维的原有排列和分布,并有较好的力学性能。后两者脱细胞时间无显著差别。结论:曲拉通可以成功用于制备大血管脱细胞基质,为组织工程瓣膜或带瓣管道的研究提供材料。     

心力衰竭大鼠ACE/ACE2相互负向调节及卡维地洛的作用

目的 探讨心肌梗死后心力衰竭大鼠心肌组织血管紧张素转化酶（angiotensin converting enzyme,ACE）与ACE2相互负向调节及卡维地洛的作用。方法 结扎大鼠左冠状动脉前降支复制心肌梗死后心力衰竭模型,随机分为心力衰竭组,卡维地洛组和假手术组;喂养2个月后检测血流动力学指标,计算左心室质量指数;放射免疫法测定心肌组织和血浆血管紧张素Ⅱ,逆转录聚合酶链反应检测心肌组织ACE和ACE2mRNA表达;蛋白质免疫印迹法检测心肌组织ACE和ACE2蛋白表达。结果 心力衰竭组大鼠循环和心肌组织血管紧张素Ⅱ水平明显升高（P〈0.01）,心肌组织ACE和ACE2的mRNA和蛋白表达均增强（P〈0.05,P〈0.01）,ACE/ACE2升高。卡维地洛组大鼠血流动力学指标改善（P〈0.01）,心肌组织血管紧张素Ⅱ水平下调（P〈0.05）,心肌组织ACE mRNA和蛋白表达下降（P〈0.01）,ACE2 mRNA和蛋白表达显著增强（P〈0.01）,ACE/ACE2降低。结论 心力衰竭大鼠心肌组织ACE和ACE2表达上调,ACE/ACE2升高;卡维地洛抑制ACE表达,增强ACE2表达,ACE/ACE2比值下降。     

糖尿病血瘀证病人血清IL-6和sIL2R水平的研究

目的研究糖尿病血瘀证病人IL 6、sIL2R水平的变化,探讨糖尿病血瘀证同IL 6、sIL2R的关系.方法将40例2型糖尿病血瘀证病人与35例非血瘀证病人的IL 6、sIL2R以及糖代谢相关指标进行比较,并以25例成人健康者作对照.应用化学发光法检测血清IL 6、sIL2R.结果同健康对照组相比,糖尿病血瘀证和非血瘀证病人血清IL 6水平明显升高(P＜0.01),sIL2R水平未见明显变化.其中,血瘀证病人血清IL-6水平明显高于非血瘀证组(P＜0.01).结论糖尿病时,炎症反应可能参与了血瘀证的形成,血清IL-6水平升高可能是糖尿病血瘀证的病理生理之一.     

婴幼儿心脏术后气管插管意外的急救与护理

本文介绍了近7年来35例婴幼儿心脏术后气管插管意外的急救处理及预防,急救成功与康复出院率为70%,通过对婴幼儿气管插管意外类型、临床特点、急救措施等进行总结分析,体会到气管插管意外重在预防,应严密观察并予以迅速处理,提高护士敏锐的观察力,培养其娴熟的抢救技能.适时的镇静及加强婴幼儿术后心理疏导,以避免气管插管意外的发生.     

中药防治脑缺血再灌注损伤的研究

现代医学研究认为缺血再灌注损伤是大多数缺血性脑血管病的主要的病理生理过程 ,其发生机制主要有自由基学说、钙超载学说、兴奋性氨基酸学说、花生四烯酸代谢失衡和白细胞损伤作用等。中医将本病归属中风范畴 ,病机为气虚不能帅血 ,或气滞血瘀阻滞脉络所致 ,是临床常见的预后较差的一种疾病 ,因而如何防止脑缺血损伤引起国内外广泛重视。近年来的研究表明 ,许多中药有抗脑缺血再灌注损伤的作用。本文就中药防治脑缺血再灌注的研究状况作一综述。1　清除自由基　人体正常代谢产生的自由基可被体内相应的自由基清除酶如超氧化物歧化酶(ＳＯＤ…     

四逆汤缓释片毒理试验研究

四逆汤是张仲景所创名方,由附子、干姜和甘草组成。方中附子为有毒之品,实验探讨了附子提取物和四逆汤缓释片的急性毒性以及四逆汤缓释片的亚急性毒性。在此基础上,测定了急性和亚急性染毒时心肌和脑组织Na K ATP酶的活性。1　实验材料1 1　动物　普通级昆明种健康小鼠,(2 0±2 )g ,雌雄各半;健康SD大鼠,(15 0±2 0 )g ,雌雄各半,由中山大学中山医学院实验动物中心提供。1 2　药物　四逆汤各单味药购于中山大学附属一院药剂科。附子总生物碱提取物和四逆汤缓释片的制备按本课题组确定的制备工艺进行。1 3　试剂　Na K ATP酶活…     

缺血预处理-后处理对大鼠肠缺血再灌注损伤的影响

Objective To evaluate the effects of ischemic preconditioning-postconditioning on the intestinal ischemia-reperfusion (IR) injury in rats. Methods Forty healthy male SD weighing 225-275 g were randomly assigned into 5 groups ( n = 8 each): group I sham operation (group S) ; group II intestinal IR (group IIR); group Ⅲ ischemic preconditioning (group Ipr); group IV ischemic postconditioning (group Ipo); group V Ipr+ Ipo. The rats were anesthetized with intraperitonel 20% urethane 5 ml/kg. Superior mesenteric artery (SMA) was occluded for 60 min followed by 60 min reperfusion. In group S, SMA was isolated but not occluded. In group Ipr, SMA was occluded for 10 min followed by 10 min reperfusion, and the rest procedures were performed using the method described in group IIR. In group Ipo, 60 min ischemia was followed by three 30 s episodes of ischemia at 30 s intervals for reperfusion. In group Ipr+ Ipo, Ipr was performed followed by Ipo and the procedures were performed using the methods described in group Ipr and Ipo. The animals were killed at 60 min of reperfusion. The intestinal tissues were immediately removed for determination of MDA content, SOD and MPO activities and the degree of damage to intestinal mucous membrane was scored according to Chiu score. Arterial blood samples were taken for determination of plasma concentrations of TNF-α and 1L-6. Results Compared with group S, Chiu score, MDA content, MPO activity, and plasma concentrations of TNF-α and IL-6 were significantly increased, whereas SOD activity decreased in the other 4 groups ( P < 0.05). Chiu score, MDA content, MPO activity, and plasma concentrations of TNF-α and IL-6 were significantly decreased, whereas SOD activity increased in group Ipr, Ipo and Ipr + Ipo as compared with group IIR ( P < 0.05). Chiu score and MDA content were significantly lower, whereas SOD activity higher in group Ipr + Ipo than in group Ipr and Ipo ( P < 0.05). No significant differences were detected in the indices between group Ipr and group Ipo ( P > 0.05). Conclusion Ischemic preconditioning-postconditioning can attenuate the intestinal IR injury in rats, and the efficacy is better than that of either Ipr or Ipo alone.     

对西药中药化的审视与反思评析

西药中药化“既有理论意义，又具实践意义；既具现实意义，更具深远意义。”认为，西药中药化是中药现代科学化的捷径，可深入对西药的再认识，并能寻求突破点，促进中西医药学的结合与统一，为医药科研提供新思路。