An experimental study of intravascular stent in abdominal aorta of atherosclerotic miniature pigs.

To study the effects of nitinol alloy stent in the treatment of atherosclerotic arterial stenosis, eight miniature pigs were subject to abdominal aortic balloon denudation and high-fatty food. Then 8 nitinol alloy stents were implanted into each abdominal aortas of pigs. The pigs were equally divided into two groups. One group was given captopril (3 mg / kg / d). All animals were sacrified) for pathological examination 6 to 10 months after stent implantation. The degree of arterial intima proliferation in the areas of stent implantation not significantly different from that of areas of balloon denudation alone; the atherosclerotic lesions were found at the arterial surface of stent implantation sites. The intima layer was rich in smooth muscle cells, with atherosclerotic plaque formed around the stent wire. On the other hand, significant decrease in arterial intima proliferation was found in group Ⅱ with no atherosclerotic plaque. The arterial stenosis resulting from atherosclerotic lesion could not be     

Experimental study on the occlusion of arterial blood flow by the implantation of nitinol alloy stents.

To evaluate the occlusion of arteries, 6 conic intravaseular endoprosthetic stents of titanium-nickel alloy were implanted transluminally to the right external iliac arteries in 2 normal dogs and 4 normal pigs. The stent was characterized by ductility below 313 K (40℃) and restoration memory-shape between 313-319 K. The diameter of the large end of conic stent was 4.0 mm (dog) and 4.5 mm(pig). The topographic anatomy showed that the external iliac artery was near complete occlusion, with a very small residual lumen (about 1 mm in diameter) in dogs at 6 months, with complete occlusion in pigs at 8 months. The histopathological examination indicated that the arterial intima of the upper branch from the stented site was smooth, and that neither inflammatory cell infiltration nor foreign giant cell reaction was found. The newly formed granulation tissue inside the stent came from emboli organization. These results suggest that the shape-memory alloy stent has good biocompatibility and the conic intravascnla     

镍钛形状记忆合金血管内支架组织相容性实验研究

将锥形记忆合金支架分别植入６只猪右侧髂动脉。用以研究镍钛形状记忆合金血管内支架生物相容性，支架植入前入植入后８个月，观测动物血常规，肝肾功能以及毛发中镍钛元素含量，均无明显变化（Ｐ〉０．０５），支架植入后８个月处死动物，全身重要脏器（肝、脾、肾、肺、心、脑等）病理学检查结构正常，无淋巴细胞和单核细胞浸润，支架植入部位上游血管壁内膜光滑，内皮细胞结构正常，内弹力板完整，支架植入段为完整肉芽组织阻塞，     

超声微泡增效骨髓干细胞移植效率的实验研究

目的在动物水平研究超声联合微泡增效骨髓干细胞(BMSCs)心肌移植的作用,为临床上提高心肌梗死后BMSCs移植效率提供一种新的思路。方法12只中国家猪分别体外分离纯化BMSCs,超顺磁性氧化铁颗粒标记;介入法建立急性心肌梗死模型,成功后14d经冠状动脉注入自体BMSCs;实验组先注入微泡后再注入BMSCs,同时行超声辐射。术后行磁共振检查;心肌做病理切光镜、透射电镜观察。结果①两组在心肌梗死区和梗死周边区磁共振上均见SPIO标记的BMSCs形成的低密度区;②实验组较对照组普鲁士蓝染色阳性细胞明显增多(P<0.01);③两组心肌超微结构无差异,但B1组见血管内皮间隙增宽。结论超声辐射微泡可增加自体BMSCs心脏的移植效率。     

冠心病介入治疗术后并发迟发型假性动脉瘤11例分析

目的探讨冠心病介入治疗术后迟发型假性动脉瘤的特点与治疗。方法回顾性分析11例冠心病介入治疗术后迟发型假性动脉瘤临床资料。结果 11例假性动脉瘤发生在术后24-72h,75岁以上和女性患者占多数。术后应用低分子肝素也有促进迟发型假性动脉瘤发生的趋势。注射凝血酶200-500U后,超声监测示瘤腔回声明显增强,瘤腔内血流信号消失。结论冠心病介入手术后迟发型假性动脉瘤不容忽视,尤其是老年女性与低分子肝素应用的患者;超声引导下的凝血酶注射是有效的治疗手段。     

铁调素与急性冠状动脉综合征相关性分析

目的分析铁调素与急性冠状动脉综合征(ACS)的相关性。方法回顾性分析ACS(ACS组,51例)、稳定性冠心病(sCAD组,117例)和冠状动脉造影证实无冠状动脉粥样硬化(对照组,24例)三组患者的临床资料。比较相关临床指标及血清铁调素水平,采用logistic回归分析ACS患者的危险因素。结果 ACS组的铁调素水平高于sCAD组和对照组[(183.80±30.28)μg/L vs.(172.55±29.29)μg/L和(166.74±27.57)μg/L](P<0.05)。铁调素、年龄、吸烟史和TG是ACS发病的影响因素(P<0.05)。结论铁调素水平升高会增加ACS患者的发病风险。     

心力衰竭合并瓣膜性心脏病介入治疗研究现状

随着人口老龄化,瓣膜性心脏病的发生率逐渐增加,常导致心力衰竭。心力衰竭也可引起心脏结构的改变,导
致继发性瓣膜病变。最常见的瓣膜病变是二尖瓣反流和主动脉瓣狭窄。以心导管为基础的介入治疗的迅速发展为
心力衰竭合并瓣膜性心脏病的治疗带来了重大突破。     

5-氮胞苷对培养大鼠骨髓基质细胞β肌球蛋白重链表达的影响 骨髓干细胞移植与心肌修复的相关效应

目的研究5-氮胞苷(5-AZ)对体外培养大鼠骨髓基质细胞(BMSC)中心肌特异性β肌球蛋白重链(β-MHC)表达的影响,探讨骨髓基质细胞向心肌样细胞分化的条件。方法体外分离培养大鼠BMSC,用不同浓度5-AZ诱导培养,以RT-PCR方法测定诱导前后β-MHC的表达。结果正常培养大鼠BMSC不表达β-MHC。经5-AZ诱导24h并继续培养后,BMSC表达β-MHC,第1～4周内由1.89±0.37增至16.41±3.63(t=0.495～5.446,P<0.01=;(1×10-7)～(1×10-5)mol/L5-AZ使β-MHC的表达由7.30±1.77增至16.28±3.72(t=0.442～2.669,P<0.01)。结论5-AZ诱导体外培养大鼠BMSC表达心肌特异性β-MHC,与诱导时间及浓度呈正相关,提示可诱导大鼠BMSC向心肌样细胞分化。     

外周血干细胞冠脉内移植治疗缺血性心脏病初步临床研究

随着冠心病发病率的日益升高，如何更有效地降低由此带来的病死率、病残率日益成为研究和关注的焦点。药物、介入、手术治疗能改善心肌缺血和心衰症状，却无法促使梗死的心肌细胞再生，心脏移植也有极大的局限性。近年来分子生物学和细胞生物工程技术的发展以及对造血干细胞研究认识的深入，     

Apolipoprotein E polymorphism in the early onset of coronary heart disease

Objective To assess the relationship between apolipoprotein E (apoE) polymorphism and the early onset of coronary heart disease (CHD) and the effect of apoE on lipids and lipoproteins in healthy Chinese subjects. Methods Sixty-eight patients with CHD younger than 55 years (CHD1), 136 patients with CHD older than 65 years (CHD2), and 136 healthy subjects were enrolled, and their plasma levels of triglyceride (TG), total cholesterol (TC) and high density lipoprotein cholesterol (HDL-C) were determined. The apoE genotypes were identified by polymerase chain reaction-restriction fragment length polymorphism.Results apoE 3/4 genotype and E4 allele frequency in the CHD1 group were higher than those in the CHD2 group and healthy subjects, while no differences were found between CHD2 and healthy subjects. Meanwhile, the plasma levels of TC and low density lipoprotein cholesterol (LDL-C) were higher in the CHD2 group than in both CHD1 group and healthy subjects.Each apoE isoprotein has variable TC and LDL-C levels that is E2 (E2/2+E2/3)＜E3(E3/3)&lt;E4(E4/4+E3/4). Conclusion apoE is one of the genetic factors that affect TC and LDL-C levels, and apoE 4 has a very close relation to CHD, suggesting that apoE 4 is an independent genetic factor of the early onset of CHD.