Evaluation of Myocardial Viability after Myocardial Infarction with Intravenous Real-time Myocardial Contrast Echocardiography

The myocardial viability after myocardial infarction was evaluated by intravenous myocardial contrast echocardiography. Intravenous real-time myocardial contrast echocardiography was performed on 18 patients with myocardial infarction before coronary revascularization. Follow-up echocardiography was performed 3 months after coronary revascularization. Segmental wall motion was assessed using 18-segment LV model and classified as normal, hypokinesis, akinesis and dyskinesis. Viable myocardium was defined by evident improvement of segmental wall motion 3 months after coronary revascularization. Myocardial perfusion was assessed by visual interpretation and divided into 3 conditions： homogeneous opacification; partial or reduced opaciflcation or subendocardial contrast defect; contrast defect. The former two conditions were used as the standard to define the viable myocardium. The results showed that 109 abnormal wall motion segments were detected among 18 patients with myocardial infarction, including 47 segments of hypokinesis, 56 segments of akinesis and 6 segments of dyskinesis. The wall motion of 2 segments with hypokinesis before coronary revascularization which showed homogeneous opacification, 14 of 24 segments with hypokinese and 20 of 24 segments with akinese before coronary revascularization which showed partial or reduced opaciflcation or subendocardial contrast defect was improved 3 months after coronary revascularization. In our study, the sensitivity and specificity of evaluation of myocardial viability after myocardial infarction by intravenous real-time myocardial contrast echocardiography were 94.7% and 78.9%, respectively. It was concluded that intravenous real-time myocardial contrast echocardiography could accurately evaluate myocardial viability after myocardial infarction.     

磁共振心肌灌注检测猪急性心肌梗死的实验研究

目的:探讨磁共振心肌灌注成像技术在检测猪急性心肌梗死后心肌活性中的作用。方法:猪心肌梗死模型13只,均进行快速梯度回波序列(FGREET)首过灌注扫描及反转恢复梯度回波序列(MDE)延迟时相扫描。扫描后处死,分析心肌首过灌注和延迟时相特点,并与病理检查结果进行对照。结果:9只首过灌注时梗死心肌表现为灌注减低,其信号强度显著低于周围心肌,12只延迟期梗死心肌表现为延迟强化,而正常心肌信号强度下降,低于梗死心肌。结论:MR心肌灌注成像可有效检测急性心肌梗死后的梗死心肌。     

磁共振心肌灌注成像评价心肌梗死PTCA治疗前后心肌存活

目的 评价磁共振心肌灌注成像(MRMPI) 检测心肌梗死存活心肌的作用. 方法 选择心肌梗死患者51 例.采用1.5 T MR扫描仪,反转恢复快速小角度激励( IR-turbo FLASH) 序列,全部患者均在静脉注射钆喷替酸葡甲胺(Gd-DTPA) 0.1 mmol/kg、MRMPI 首过期及5~30 min 延迟期成像.21 例行静息、负荷99锝单光子发射计算机体层摄影术( single photon emission computed tomography, SPECT) 进行对照研究.首过期行短轴面成像,延迟期行短轴面及长轴面成像.结果 51例心肌梗死患者,42 例(82.3%) 首过期显示灌注减低;50 例(98%) 延迟增强.在21例168个心肌段SPECT诊断无活性心肌段48个,MRMPI 示梗死区均有延迟增强,SPECT诊断存活心肌段120 个,MRMPI 示97段无延迟增强.以静息、负荷99m锝SPECT 作为参考标准,MRMPI 的敏感度、特异度分别为100%、80.8%. 结论 MRMPI 可有效地检测心肌梗死的存活和非存活心肌,以及其程度和范围.     

不典型急性心肌梗死漏误诊分析

目的：探讨急性心肌梗死（AMI）的临床特点。方法：回顾分析8年间217例AMI住院患者的临床资料。结果：36例被漏误诊的AMI患者起病时多无典型心绞痛，首发表现为呼吸困难、胸闷、面色苍白、出汗、乏力、胃肠道反应、意识障碍等症状，多数患者心电图不典型。结论：询问病史、临床症状及动态观察心电图可减少误诊漏诊。     

心肌声学造影对急性心肌梗死急诊介入术后心肌灌注及预后评估

目的 通过实时心肌声学造影(MCE)评估急性心肌梗死（AMI）急诊介入术后微循环灌注情况及其对AMI预后的评估价值。方法纳入108例AMI且行急诊介入手术患者,术后3～5 d行心肌声学造影,记录患者左室射血分数（LVEF）、室壁运动评分指数（WMSI）、左室收缩末期容量（LVESV）、左室舒张末期容量（LVEDV）、左室舒张末期内径（LVIDd）、二尖瓣E峰速度（MVE）、二尖瓣A峰速度（MVA）、左室质量指数（Lvmassi）及造影剂评分指数（CSI）。出院后1年对108例患者进行电话随访,根据是否发生不良心血管事件（MACE）分为MACE组和非MACE组。结果（1）MACE组患者WMSI、CSI、LVESV更高,而LVEF则较低,两组差异有统计学意义(P<0.05)。（2）前壁心肌梗死MACE事件的发生和更多的心肌灌注缺损有关系。（3）CSI可以作为AMI急诊介入术后MACE事件发生的独立危险因素;（4）CSI≥1.58较 CSI<1.58的AMI患者1年后MACE事件发生率更高(45% vs. 9% P=0.001)。结论MCE能评估AMI急诊介入术后患者微循环灌注情况; CSI能独立预测AMI患者急诊介入术后MACE事件,从而对该类人群进行危险分层,尽早识别高危患者,规避恶性事件发生。     

心肌缺血预适应对初次急性心肌梗死患者临床及近期预后的影响

目的评价急性心肌梗死(AMI)发病前48h内的心绞痛发作对初次AMI临床及近期预后的影响。方法138例均为初次AMI患者,按发病前48h内有无心绞痛发作,分为缺血预适应(IP)组(n=54)和非缺血预适应(NIP)组(n=84),对比两组心肌酶峰值、恶性心律失常、心源性休克及院内死亡率。结果IP组临床及近期预后较好,表现为心肌梗死范围较小(P<0.05),心肌酶峰值较低(P<0.05),近期住院期间严重心律失常、心源性休克、明显心力衰竭、心源性病死率均低于NIP组(P<0.05)。结论初次AMI前48h内心绞痛的发作对心肌有一定的保护作用,其机理可能与心肌缺血预适应有关。     

MR电影判断急性心肌梗死后存活心肌的价值

目的:探讨MR电影心肌运动影像判断急性心肌梗死后存活心肌的价值。方法:分析22例急性心肌梗死患者(急性梗死组)和20例正常对照组的MR电影,判断MR电影对急性心肌梗死后存活心肌检测率。结果:正常对照组心肌各室壁厚度变化一致(P>0.05),梗死心肌节段室壁厚度变化明显小于正常心肌(P<0.05)。室壁厚度变化减小(<2mm)对梗死心肌节段的检测敏感性为77%,特异性为100%;结合首过及延迟灌注异常可将其敏感性提高到91%。结论:MR电影心肌运动影像是MRI诊断急性心肌梗死后存活心肌可靠的指标,可初步判断心肌存活性,行靶区首过心肌灌注可以明显提高检查的敏感性。     

早期应用替罗非班对急性ST段抬高型心肌梗死急诊行经皮冠状动脉介入术后心肌组织灌注的影响

目的评价国产早期应用血小板膜糖蛋白GPⅡb/Ⅲa受体拮抗剂替罗非班对急性ST段抬高型心肌梗死(STEMI)急诊行经皮冠状动脉介入术(PCI)后心肌组织灌注及安全性的影响。方法回顾分析2007-05～2010-11期间因初次急性STEMI入住运城市中心医院CCU行急诊经桡动脉PCI治疗的患者108例,其中联合替罗非班治疗者(替罗非班组)54例,未联合替罗非班治疗者(对照组)54例。比较两组间临床特征、PCI术前及术后TIMI分级、PCI术后TIMI心肌灌注分级(TMPG)、术后2 h心电图ST段回落百分比(sumSTR)及QT离散度(QTd),并观察出血并发症。结果治疗前两组患者临床基本情况无显著差异。替罗非班组PCI术前TIMI3级获得率较对照组明显增高(29.63%vs 11.11%,P=0.03),术后TIMI3级获得率差异无统计学意义。替罗非班组术后TMPG 3级获得率(94.44%vs 74.07%,P=0.01)、术后2 h ST段完全回落率(88.89%vs 68.52%,P=0.02)均明显高于对照组。术后2 h QT离散度替罗非班组明显低于对照组(24.80±4.26 vs 51.11±8.91,P<0.001)。替罗非班组轻微出血发生率有高于对照组趋势(9.26%vs 3.70%,P=0.43),但无严重出血或血小板减少症。结论国产替罗非班可提高急性STEMI急诊行经皮冠PCI术后心肌组织灌注,且安全可行。     

心脏彩超检测在急性心肌梗死后心室重塑中的应用价值

目的应用心脏彩超检测技术评价急性心肌梗死(AMI)后不同时间段心室重塑的程度并探讨该技术的临床价值。方法回顾性分析2019年1月至2019年8月在泰安市中心医院心内科住院首次发生AMI的87例患者。所有研究对象于AMI后第1天、第7天、第1个月和第6个月分别用应用心脏彩超测量左心室舒张末期容积指数(LVEDVI)。第7天、第1个月和第6个月LVEDVI与第1天LVEDVI差值为⊿LVEDVI,发生心室重塑标准:⊿LVEDVI≥5 mL/m^2,⊿LVEDVI<5 mL/m2定义为未发生心室重塑。结果所有研究对象在6个月的随访中,无论是否急症再灌注治疗,均于AMI后出现心室重塑。急症再灌注患者第7天、第1个月及第6个月⊿LVEDVI较第1天逐渐增大,差异有统计学意义(P<0.05)。未行急症再灌注患者第7天、第1个月及第6个月⊿LVEDVI较第1天亦逐渐增大,差异有统计学意义(P<0.05)。随着时间的延长,心室重塑的程度逐渐加重,AMI后1个月心室重塑的速度降低,但仍在发展。未行急性再灌注治疗患者心室重塑程度较行急性再灌注治疗患者明显。结论AMI后心室重塑会持续存在,心脏彩超在评价AMI心室重塑中准确、可靠、方便,是一种很好的无创检测方法,值得临床推广应用。     

Endothelial progenitor cell mediates transport of hepatitis B virus into myocardial tissue

Background Hepatitis B virus （HBV） replication has been reported to be involved in many extrahepatic viral disorders; however, the mechanism by which HBV is transinfected into extrahepatic tissues such as myocardium and causes HBV associated myocarditis remains largely unknown.
Methods In this study, endothelial progenitor cells （EPCs） were infected by HBV and then transfused into ischemic model of mice. HBV surface and core antigen as well as mutation of HBV particles were detected by immunohistochemistry, fluorescent activated cell sorter and transmission electron microscopy in vitro and in vivo.
Results Human cord blood EPCs, but not human umbilical vein endothelial cells （HUVECs） could be effectively infected by taking up HBV in vitro. HBV envelope surface and core antigen expressions were first detectable in EPCs at day 3 after virus challenge, sustained for up to 11 days, and decreased thereafter. Similarly, the virus particles were the most abundant in EPCs in the first week observed by a transmission electron microscope, and declined in 3 weeks after HBV infection. HBV DNA but not HBV cccDNA in EPCs were detectable even 3 weeks after virus challenge, as shown by PCR analysis. Furthermore, intravenous transplantation of HBV-treatod EPCs into myocardial infarction Sprague ＆ Dawley rats model resulted in incorporation of both EPCs and HBV into injured endothelial tissues of capillaries in the ischemic border zone.
Conclusions These results strongly support that EPCs serve as virus carrier mediating HBV trans-infection into the injured myocardial tissues. The findings might suggest a novel mechanism for HBV-associated myocarditis.     

Intracoronary adenosine improves myocardial perfusion in late reperfused myocardial infarction

Background Myocardial perfusion associates with clinical syndromes and prognosis.Adenosine could improve myocardial perfusion of acute myocardial infarction within 6 hours,but few data are available on late perfusion of myocardial infarction (MI).This study aimed at quantitatively evaluating the value of intracoronary adenosine improving myocardial perfusion in late reperfused MI with myocardial contrast echocardiography(MCE).Methods Twenty-six patients with anterior wall infarcts were divided randomly into 2 groups:adenosine group(n=12) and normal saline group(n=14).Their history of myocardial infarction was about 3-12 weeks.Adenosine or normalsaline was given when the guiding wire crossed the lesion through percutaneous coronary intervention(PCI),then the balloon was dilated and stent(Cypher/Cypher select)was implanted at the lesion.Contrast pulse sequencing MCE with Sonovue contrast via the coronary route was done before PCI and 30 minutes after PCI.Video densitometry and contrast filled-blank area were calculated with the CUSQ off-line software.Heart function and cardiac events were followed up within 30 days.Results Perfusion in the segments of the criminal occlusive coronary artery in the adenosine group was better than that in the saline group(5.71±0.29 vs 4.95±1.22,P＜0.05).Ischemic myocardial segment was deminished significantly afterPCI,but the meliorated area was bigger in the adenosine group than in the saline group((1.56±0.60)cm2 vs(1.02±0.56) cm2,P＜0.05).The video densitometry in critical segments was also improved significantly in the adenosine group (5.53±0.36 vs 5.26±0.35,P＜0.05).Left ventricular ejection fraction(LVEF)was improved in all patients after PCI,but EF was not significant between the two groups((67±6)% vs(62±7)%,P＞0.05).There was no in-hospital or 30-day major adverse cardiac event(MACE)in the adenosine group but 3 MACE in the saline group in 30 days after PCI.Conclusions Adenosine could improve myocardial microvascular perfusion in the late reopening of an occluded infarct reIaled artery(3 to 12 weeks after AMI)and clinical outcome in the follow-up period,and myocardial microvascular perfusion is a powerful predictor of clinical events.     

心肌梗塞患者自然杀伤细胞活性检测

用１２５ＩＵｄＲ释放法测定１７例急性心肌梗塞（ＡＭＩ）后一周内的外周血自然杀伤（ＮＫ）细胞活性，并与１３例陈旧性心肌梗塞（ＯＭＩ）及５８例正常人对照。结果表明：ＡＭＩ组ＮＫ细胞活性明显低于正常组及ＯＭＩ组（Ｐ＜０．０１）。ＡＭＩ组中，梗塞面积广泛者ＮＫ细胞活性明显低于梗塞面积局限者（Ｐ＜０．０１）。提示ＮＫ细胞活性可作为ＡＭＩ诊断和预后判断的一个辅助参考指标。     

99mTc-MIBI 心肌断层显像评价急性心肌梗塞后左心室重构

目的应用９９ｍＴｃ－ＭＩＢＩ静息心肌显像评价心肌梗塞后左心室重构。方法对７６例急性心肌梗塞患者的局部及整体左心室重构进行了９９ｍＴｃ－ＭＩＢＩ静息心肌显像评价,其中４２例为非门控静息心肌显像,３４例为门控静息心肌显像,９９ｍＴｃ－ＭＩＢＩ静息心肌断层显像于发病后平均１２ｈ、１～２周、１～３月分别进行。结果左心室重构的显像表现为梗塞膨展：室壁变薄（７２／７６）,室壁拉长（５８／７６）,局部扩张（５５／７６）及局部变形（５１／７６）;非梗塞心肌的重构：室壁变厚（３６／７６）及室壁拉长（４９／７６）;左心室整体变形（３５／７６）及左心室整体扩张（４２／７６）。将左心室重构分为３度：Ⅰ度（２５／７６）,无左心室整体变形及整体扩张;Ⅲ度（３１／７６）,有左心室整体变形及整体扩张;Ⅱ度（２０／７６）,介于Ⅰ度与Ⅲ度之间者,左心室重构的程度随病情的发展而改变,通过分析急性心肌梗塞后系列静息心肌显像,可对左心室重构程度的变化作出评价。结论左心室重构是评价急性心肌梗塞治疗效果和预后的重要依据;９９ｍＴｃ－ＭＩＢＩ心肌断层显像是评价急性心肌梗塞后左心室重构的有用技术。     

Real-time three-dimensional myocardial contrast echocardiography in assessment of myocardial perfusion defects

Background Both real-time three-dimensional echocardiography (RT3DE) and myocardial contrast echocardiography (MCE) are novel imaging techniques. The purpose of this study was to confirm the feasibility and accuracy of RT3DE combined with MCE for quantitative evaluation of myocardial perfusion defects. Methods Thirteen dogs underwent ligation of the left anterior descending artery (LAD, n=6) or distal branch of the left circumflex artery (LCX, n=7) under general anaesthesia. Three to four ml of a perfluoropropane (C3F8) microbubble contrast agent was injected intravenously to assess the resulting myocardial perfusion defects with a commercially available Philips SONOS-7500 ultrasound system. After removal of the dog hearts, Evans blue dye was injected via the left and right coronary arteries to stain the myocardium at risk. In vitro anatomic measurements of myocardial mass after removal of the animals’ hearts were used as controls. Results Left ventricular (LV) mass determined by RT3DE ranged 36.7-68.9 g ［mean, （54.6±9.6） g］ before coronary artery ligation, and correlated highly (r=0.99) with in vitro measurement of LV mass ［range, 38.9-71.1 g; mean, (55.6±9.3) g］. There was no significant difference between RT3DE and in vitro measurements of LV mass ［range, 36.7-68.9 g; mean, （51.3±12.5） g. Or range, 38.9-71.1 g; mean, （53.7±12.3） g, respectively］ and under-perfused mass ［range, 0-21.4 g; mean, （12.0±6.9） g. Or range, 0-19.8 g; mean, （10.8±6.3） g, respectively］ after the LAD ligation (P&gt;0.05). Likewise, no significant difference was present between RT3DE and in vitro measurements of LV mass ［range, 50.1-65.4 g; mean, （57.5±5.9） g. Or range, 51.5-65.8 g; mean, （57.3±6.4） g, respectively］ and under-perfused mass ［range, 0-25.6 g; mean, （13.3±9.6） g. Or range, 0-22.7 g; mean, （12.8±8.1） g, respectively］ after the LCX ligation (P&gt;0.05). For all the animals with coronary ligation, LV mass measured by RT3DE ranged 35.9-68.6 g ［mean, （54.8±10.0） g］ and there was no significant difference between RT3DE and in vitro measurements of LV mass and under-perfused mass (P&gt;0.05, r=0.99). Further, the under-perfused mass derived from RT3DE ［range, 0-25.6 g; mean, （12.7±8.2） g］ correlated strongly with the in vitro measurements ［range, 0-22.7 g; mean, （11.9±7.2） g］ (r=0.96). Conclusion RT3DE with MCE is a rapid and accurate method for estimating LV myocardial mass and quantifying perfusion defects.     

再灌注心肌损伤的表现及机制

心肌缺血后的再灌注对于挽救心肌细胞死亡是非常必要的。然而心肌短暂性缺血后的再灌注也可导致新的病理生理变化,包括心肌收缩和血管内皮细胞功能紊乱,微血管萎陷和血供障碍以及心肌细胞的坏死和凋亡。这些损伤不仅发生在再灌注的早期,而且还可扩展到晚期。实验证实,再灌注可促使氧自由基、细胞素以及其他一些促炎性介质的释放,导致血细胞(如白细胞和吞噬细胞)和血管内皮细胞之间发生交互作用。血细胞进一步通过其在内皮细胞上的粘附特性可游走到血管外,并可和心肌细胞发生直接的交互反应。因此,在选用减少再灌注损伤的有效措施时应考虑到再灌注晚期发生的病生理变化。在再灌注的不同时间内,选择性阻断细胞-细胞间的相互作用,可为解释炎性细胞和心肌损伤扩展间的关系提供直接的实验依据。鉴此,充分了解再灌注所致的变化机制对于减少血栓溶解疗法、血管成形术及心脏外科手术后的损伤有着极为重要的意义。     

诊断早期心肌缺血三种组织学染色方法的比较

目的 探讨检验早期心肌缺血的最佳组织学染色方法，方法 对45例经尸体解剖病理诊断为冠心病的心肌组织分别进行HE染色，Heidenhain染色，光镜下观察。结果 Heidenhain染色方法可以准确检验发病过程在0.5h内的缺血心肌纤维。结论 Heidenhain染色方法可使早期缺血的心肌纤维出现明显的反应，效果优于HE染色方法和HBFP染色方法，特异性强，操作简便易行，可以将其作为诊断早期心肌缺血的一个首选染色方法加以应用。     

急性心肌梗塞心肌再灌注心电图定量研究

本文对１７例接受尿激酶（溶栓组）、２５例接受极化液（非溶栓组）治疗的急性心肌梗塞患者运用心电定量心肌梗塞面积。用药前采用ＳＴ段运算法预计梗塞面积，住院７２ｈ后用ＱＲＳ积分法计算实际梗塞面积，二者之差为梗塞缩小面积，并以此计算梗塞心肌存活率，大于－２０％者为再灌注。结果显示溶栓组平均心肌梗塞面积缩小６．７％，梗塞区心肌存活率－２９．２％，早期溶栓（＜３ｈ）４例（４／５）符合心肌再灌注标准；晚期溶栓（３～８ｈ）６例（６／１２）符合再灌注标准。而非溶栓组无一例符合再灌注标准。故认为溶栓治疗是急性心肌梗塞的首选方法。     

Factors affecting thrombolysis in myocardial infarction myocardial perfusion frame count: insights of myocardial tissue-level reperfusion from a novel index for assessing myocardial perfusion

Background  Myocardial tissue-level perfusion failure is associated with adverse outcomes following ST-elevation myocardial infarction (STEMI) despite successful epicardial recanalization. We have developed a new quantitative index—thrombolysis in myocardial infarction (TIMI) myocardial perfusion frame count (TMPFC)—for assessing myocardial tissue level perfusion. However, factors affecting this novel index of myocardial perfusion are currently unknown.

Methods  A total of 255 consecutive STEMI patients undergoing primary angioplasty were enrolled. Myocardial tissue level perfusion was assessed by TMPFC, which measures the filling and clearance of contrast in the myocardium using cine-angiographic frame counting. We differentiate three groups with two cut off values for TMPFC: a TMPFC of 90 frames was the upper boundary of the 95% confidence interval (CI) for the TMPFC observed in normal arteries, and a TMPFC of 130 was the 75th percentile of TMPFC.

Results  STEMI patients with TMPFC >130 frames (68 patients, 26.7%) had higher clinical and angiographic risk factor profiles as well as a higher 30-day MACE rate compared with those with TMPFC ≤90 frames and those with TMPFC >90 and ≤130 frames. Multivariable analysis identified that the independent predictors of TMPFC >130 frames were age ≥75 years (OR 2.08, 95% CI 1.21 to 3.58, P=0.007), diabetes (OR 1.37, 95% CI 1.01 to 1.86, P=0.042), Killip class ≥2 (OR 1.52, 95% CI 1.05 to 2.21, P=0.027), and prolonged pain-to-balloon time (OR 1.73, 95% CI 1.07 to 2.79, P=0.013). TMPFC >130 frames was identified as the strongest independent predictor of 30-day major adverse cardiac event (MACE) (OR 2.77, 95% CI 1.21 to 6.31, P=0.008), along with age ≥75 years (OR 2.19, 95% CI 1.11 to 4.33, P=0.016), female gender (OR 1.67, 95% CI 1.03 to 2.70, P=0.038), and Killip class ≥2 (OR 1.83, 95% CI 1.07 to 3.14, P=0.021).

Conclusions  STEMI patients with poor myocardial perfusion assessed by TMPFC had higher risk factor profiles. Advanced age, diabetes, higher Killip class, and longer ischemia time were independent predictors of impaired TMPFC after primary percutaneous coronary intervention. These results emphasize that particular attention should be paid on myocardial microvascular reperfusion in STEMI patients with these risk factors.

     

急性心肌梗塞心电图超急期诊断5例报告

对５例急性心肌梗塞超急期心电图进行分析。首次心电图基本符合Ｓｃｈａｍｒｏｔｈ标准，及时认识此期心电图的变化，对早期心肌梗塞的诊断、治疗和预后均有重要的临床意义。     

Intracoronary adenosine improves myocardial perfusion

Background Myocardial perfusion associates with clinical syndromes and prognosis. Adenosine could improve myocardial perfusion of acute myocardial infarction within 6 hours, but few data are available on late perfusion of myocardial infarction （MI）. This study aimed at quantitatively evaluating the value of intracoronary adenosine improving myocardial perfusion in late reperfused MI with myocardial contrast echocardiography （MCE）.
Methods Twenty-six patients with anterior wall infarcts were divided randomly into 2 groups： adenosine group （n=12） and normal saline group （n=-14）. Their history of myocardial infarction was about 3-12 weeks. Adenosine or normal saline was given when the guiding wire crossed the lesion through percutaneous coronary intervention （PCI）, then the balloon was dilated and stent （Cypher/Cypher select） was implanted at the lesion. Contrast pulse sequencing MCE with Sonovue contrast via the coronary route was done before PCI and 30 minutes after PCI. Video densitometry and contrast filled-blank area were calculated with the CUSQ off-line software. Heart function and cardiac events were followed up within 30 days.
Results Perfusion in the segments of the criminal occlusive coronary artery in the adenosine group was better than that in the saline group （5.71：L-0.29 VS 4.95±1.22, P〈0.05）. Ischemic myocardial segment was deminished significantly after PCI, but the meliorated area was bigger in the adenosine group than in the saline group （（1.56±0.60） cm^2 vs （1.02±0.56） cm^2, P〈0.05）. The video densitometry in cntical segments was also improved significantly in the adenosine group （5.53±0.36 VS 5.26±0.35, P〈0.05）. Left ventricular ejection fraction （LVEF） was improved in all patients after PCI, but EF was not significant between the two groups （（67±6）% vs （62±7）%, P〉0.05）. There was no in-hospital or 30-day major adverse cardiac event （MACE） in the adenosine group but 3 MACE in the saline group in 30 days after