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，     

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)<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.     

经皮冠状动脉腔内成形术治疗冠心病200例

200例冠心病患者,63例为心肌梗塞后择期冠脉血管成形术（PTCA）;132例患劳力型心绞痛、5例急性心肌梗塞（AMI）为急诊PTCA。PTCA方法按常规进行,195例成功,成功率97．5％。扩张232处病变,其中左前降支病变147处,右冠病变63处,回族支病变22处。冠脉病变分型：A型病变118支,B1型病变68支,B2型病变21支,C型病变25支。C型中21支为完全闭塞病变,17例手术成功。手术并发症包括急性血管闭塞2例,血管内膜撕裂C型以上15例,死亡1例。4年随访中,5例患者症状复发,其中3例为原扩张部位再狭窄。     

冠心病临床诊断及冠状动脉病变特点再探讨(附450例冠脉造影分析)

为探讨冠心病（CHD）临床诊断的注意点,统计分析5年完成的选择性冠状动脉造影（CAG450例。结果提示依据典型心前区疼痛可得到一较为可靠的初步结论,心前区不适时常规12导联心电图的动态变化对CHD的诊断有较大价值。运动心电图诊断CHD的特异性在男性病人较高,在女性则较低。非创伤性检查中以心电图的动态改变对CHD的诊断价值最大;CHD血管病变中以前降支病变多见,且常合并有其它血管病变而形成两支病变。     

紫杉醇药物涂层支架治疗左前降支病变临床研究

目的：探讨紫杉醇药物涂层支架（PES）治疗冠状动脉左前降支（LAD）病变的即刻疗效及预后。方法：2003年2月～2005年3月在本院造影证实连续LAD单支病变患者94例，共107处病变，按常规行经皮冠状动脉成形术加支架置入术，分析患者临床、X线影像学特征及手术成功率，并行随访。结果：94例患者中，29例置入PES，65例置入金属裸支架（BMS），手术成功率100％。病变弥漫性30例（31．9％），位于近段52例（55．3％），中段12例（12．8％）。全部患者均完成术后6个月的随访并行造影复查。PES组术后6个月时造影复查2例（6，9％）发生再狭窄；BMS组1例1个月内因急性前壁心梗死亡，6个月时造影复查21例（32．3％）发生再狭窄。结论：PES置入治疗冠状动脉LAD病变安全有效，术后心源性猝死及非Q波性心肌梗死发生率与置入BMS者相似，支架内再狭窄发生率明显降低，因再狭窄需冠脉搭桥率也显著降低，术后6个月再狭窄率与文献报道冠脉搭桥术相近。     

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。     

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.     

缓激肽预适应人内皮祖细胞移植治疗裸鼠急性心肌梗死

目的:研究内皮祖细胞(endothelial progenitor cells,EPCs)经缓激肽(bradykinin,BK)预适应后移植对急性心肌梗死(acute myocardial infarction,AMI)的治疗作用?方法:细胞分为未经BK预适应人EPCs组(EPCs组)?BK预适应EPCs组(BK PC组)?BK预适应EPCs + 艾替班特(HOE140)组(BK PC/HOE组),双染色法四甲基偶氮唑蓝(MTT)比色法检测各组增殖情况,予缺氧诱导后Annexin V-FITC/PI双染色法及Hoechst33342染色法检测各组凋亡情况,同时收集上清液予ELISA法检测血管内皮生长因子(VEGF)的表达?体内实验建立裸鼠急性心肌梗死模型,将羰花青荧光染料DiD标记的人EPCs通过心肌局部注射进行细胞移植到实验组,安慰剂组注入等量生理盐水?分为假手术组?MI + 生理盐水组(安慰剂组)?MI + 单纯干细胞治疗组(EPCs组)?MI + BK预适应EPCs治疗组(BK PC组)及MI + BK预适应EPCs + HOE140治疗组(BK PC/HOE组)?细胞移植后10 d行超声心动图检测心功能?移植后10 d处死动物,取心脏标本行相关检查?结果:①与EPCs组相比,BK预适应可促进人EPCs增殖;缺氧诱导凋亡后,BK PC组凋亡率低于EPCs组(P < 0.01),且均可被HOE140阻断(P < 0.01)?同时BK PC组上清液中VEGF的分泌高于EPCs组(P < 0.01),同样可被HOE140所阻断;② 细胞移植10 d后BK PC组左心射血分数(LVEF)明显高于安慰剂组(P < 0.01)及EPCs组(P < 0.01),且可被HOE140阻断(P < 0.01)?与安慰剂组及EPCs组相比,BK PC组梗死周边区移植细胞存活明显增多,而细胞凋亡显著减少;同样可被HOE140所阻断?结论:BK预适应人EPCs后可显著改善裸小鼠AMI后的心功能,其疗效明显优于单纯人EPCs移植治疗?其治疗效应是通过促进移植细胞存活及抗移植细胞及宿主心肌细胞凋亡等而实现的?