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。     

大鼠骨髓基质细胞培养方法的改良

目的　对体外分离培养大鼠骨髓基质细胞 (BMSC)方法进行改良 ,观察其生物学特点。方法　分离大鼠胫骨、股骨 ,以 IMDM培养基冲洗骨髓 ,与培养液混合后直接接种至培养瓶中 ,接种后 7～ 14 d形成单层贴壁的成纤维状细胞。检测传代细胞接种贴壁率、生长曲线、细胞周期 ,电镜观察细胞超微结构。结果　分离培养的原代 BMSC生长良好 ,倍增时间约为 4 2 h。 BMSC传代后 12 h贴壁率达 80 %以上 ,82 %的细胞处于 G0 、G1 期 ,超微结构呈现较早期细胞特点。结论　改良法培养的 BMSC生长稳定 ,传代细胞适应性强。与传统培养方法比 ,该法操作简单、实用性强 ,可以用于 BMSC的体外实验研究     

国产Partner冠状动脉支架治疗冠心病的疗效及临床随访

目的 评价国产Partner冠状动脉支架治疗冠心病的安全性和疗效.方法 回顾性分析在21个心脏中心置入Partner冠状动脉支架的1352例冠心病患者,观察术后1年内心源性死亡、心肌梗死、靶血管重建率、主要不良心脏事件(MACE)和支架内血栓形成发生率.结果 1352位患者共1869处病变置入Partner支架.其中,糖尿病患者占23.3%,急性冠状动脉综合征的患者占90.49%,C 型病变占30.98%,分叉病变占11.13%,慢性完全闭塞病变占7.81%;靶病变血管平均长度21.99±10.57 mm,病变平均狭窄程度88.18%±10.93%,参考血管直径3.17±1.81 mm,病变最大扩张压力13.77±3.01 atm;使用球囊预扩张的病变占78.12%,球囊后扩张的病变占25.79%.随访结果显示:12个月累积心源性死亡0.52%,心肌梗死0.96%,靶血管重建2.14%,MACE 3.62%,数据均在可接受范围内.患者1年累积血栓发生率(0.66%)与其他研究结果类似.结论 1 年的随访结果表明,国产Partner冠状动脉支架的安全性和有效性良好.     

冠状动脉病变严重程度、冠心病介入治疗对QT离散度的影响

QT离散度(QTd)是近年来发展起来的1项预测心脏复极同步的新指标.本研究旨在探讨冠状动脉病变严重程度、介入治疗对QTd及校正QTd(QTcd)的影响.