静滴硝酸甘油介入99Tcm-MIBI心肌显像对存活心肌的评价

目的评价静脉滴注硝酸甘油(NTG)介入99Tcm-甲氧异丁基异腈(MIBI)心肌断层显像对心肌存活的估测价值.方法对45例心肌梗死患者先行常规静息态99Tcm-MIBI心肌断层显像,24～48h后静脉滴注NTG再行静息态心肌断层显像.结果静息态心肌断层显像检出心肌梗死灶节段111个,NTG介入后有75个梗死灶节段再填充(67.6%),NTG介入后梗死灶节段放射性计数为74.74±81.30明显较静息时(44.45±62.60)增大.结论静脉滴注NTG对提高静态99Tcm-MIBI心肌断层显像估测心肌存活有一定的临床价值.     

二硝酸异山梨醇酯介入~(99m)Tc-MIBI再注射心肌断层显像评估存活心肌

目的 :观察 Isoket介入99m Tc- MIBI再注射显像能否提高心肌存活力。方法 :2 8例病人首先静脉注入 99m Tc- MIBI进行静息心肌断层显像 ,2 4 h后全部病人给予 Isoket2 0 mg+生理盐水2 0 0 ml滴注 ,静点结束后静脉注入 99m Tc- MIBI再次进行心肌显像。结果 :静息 99m Tc- MIBI显像的平均得分为 1 5.1± 3.8,Isoket介入 99m Tc- MIBI再注射显像的平均得分为 1 0 .8± 1 .6,两者比较差异显著 (P<0 .0 1 )。结论 :Isoket介入 99m Tc- MIBI再注射显像与静息 99m Tc- MIBI显像比较可明显提高对存活心肌检测的灵敏度。     

药物介入核素心肌显像在识别存活心肌中的作用

目的:研究核素心肌显像在识别存活心肌中的准确性及实用性。方法 :对 2 0 0 0年 10月～ 2 0 0 1年 9月行 PTCA+支架术的 30例住院心肌梗死患者 (梗塞后 2周至 3个月 ) ,采用 PTCA支架术前静点小剂量多巴酚丁胺 (3μg· kg- 1· min- 1 ) ,并合用舌下含服硝酸甘油 (0 .5 m g) 99m TC- MIBI心肌显像 ,与术后 3周时复查静息 99m TC-MIBI心肌显像进行对比 ,观察多巴酚丁胺与硝酸酯合用预测存活心肌的准确度及安全性。结果:PTCA支架术前静息 99m Tc- MIBI心肌灌注显像共有 117个节段心肌摄取异常。药物介入 99m Tc- MIBI心肌灌注显像及 PTCA支架术后 3周静息 99m Tc- MIBI心肌灌注显像放射性分布异常节段心肌血流灌注改善。术前静息心肌灌注显像的 117个节段 ,药物介入 99m Tc- MIBI心肌灌注显像有 4 1个节段灌注改善 ,2 3个节段正常 ,5 3个节段无变化。PTCA支架术后 3周随访中有 4 8个节段改善 ,2 8个节段正常 ,无效的 5 3个节段在 PTCA支架术后有 4 1个节段心肌灌注无改善。结论 :以 PTCA支架术后 3周为标准 ,静脉应用小剂量多巴酚丁胺时舌下含服硝酸甘油 (0 .5 m g)核素心肌显像 ,预测存活心肌灵敏度为 84 .2 % ,特异度为 77.4 % ,具有安全性高、副作用小、患者易于接受的优点     

~(99)Tc~m-MIBI心肌断层显像前硝酸甘油评估存活心肌

目的　探讨含服硝酸甘油在介入99Tcm MIBI心肌断层显像在判断心肌存活中的价值。方法　 12例心肌梗塞患者先行静息99Tcm MIBI心肌断层显像 ,4 8h后在静脉注射99Tcm MIBI前 5min舌下含服硝酸甘油 0 .5mg ,然后再行静息心肌断层显像 ,观察灌注情况。 结果　 12例心肌梗塞患者静息心肌断层显像有 6 8个节段放射性分布异常 ,含服硝酸甘油介入后 2 6个节段灌注改善 ;4 2个节段无变化或有异常加重。结论　含服硝酸甘油在介入99Tcm MIBII心肌断层显像对判断心肌存活有一定的临床价值 ,且方法简便易行 ,安全可靠。     

硝酸甘油介入99mTc-MIBI心肌灌注显像检测存活心肌

目的应用硝酸甘油(NTG)介入^99mTc-甲氧基异丁基异腈(MIBI)SPECT心肌显像评价心肌梗死患心肌细胞存活的情况。方法20例心肌梗死患分别行^99mTc-MIBI静息和NTG介入心肌显像，并进行对比分析。结果20例患共有75个心肌灌注异常节段，其中32个节段在NTG后心肌血流灌注改善，呈现可逆性缺损，占42.67％。结论NTG介入^99mTc—MIBISPECT心肌显像可明显提高心肌梗死患存活心肌细胞的检出率。     

硝酸甘油介入99mTc-MIBI SPECT心肌灌注显像评价存活心肌

目的探讨含服硝酸甘油(NTG)介入99mTc甲氧基异丁基异晴(99mTc-MIBI)单光子发射计算机断层(SPECT)心肌灌注显像在检测存活心肌中的价值。方法18例心肌梗死患者分别行99mTc-MIBI静息显像和24h后再次静脉注射99mTc-MI-BI,在注射前5min,患者给与硝酸甘油1.0mg舌下舍服,再次行静息心肌断层显像,并进行对比分析。结果18例患者共有97个心肌灌注异常节段,其中44个心肌节段在NTG后心肌血流灌注改善,呈现可逆性缺损,占45.36%;53个节段无变化。结论NTG介入99mTc-MIBISPECT心肌灌注显像可明显提高心肌梗死患者存活心肌细胞的检出率,可以真实地评价心肌梗死的面积和部位,并且操作安全、无创、方便。     

LDDE和含服硝酸甘油 99m / Tc～MIBI心肌灌注显像对血管重建术后存活心肌的评估

目的 :采用低剂量多巴酚丁胺超声心动图 (LDDE)和含服硝酸甘油 (NTG)介入99mTc MIBI心肌灌注显像评价血管重建术前后的心肌存活性 ,并进行对比分析。方法 :将 37例心肌梗塞患者分为 3组 ,于血管重建术前分别行LDDE和 /或NTG介入99mTc MIBI心肌灌注显像 ,术后 1个月行基础超声心动图或静息99mTc MIBI心肌显像。结果 :Ⅰ组 ,NTG介入99mTc MIBI心肌灌注显像对术后心肌灌注改善的阳性预测值为 86 1 % ,阴性预测值为 79 2 % ,准确率为 82 6% ;Ⅱ组 ,LDDE对术后室壁运动改善的阳性预测值为 82 5% ,阴性预测值为 81 1 % ,准确率为 81 6% ;Ⅲ组 ,2种方法对低动力心肌节段功能恢复的预测无显著差异 (P >0 0 5) ;而对无动力心肌节段差异显著 (P <0 0 5) ;LDDE和NTG介入99mTc MIBI心肌灌注显像对整个运动障碍节段功能恢复预测的敏感性分别为 70 2 %和84 9% ,特异性分别为 87 2 %和 68 2 %。结论 :LDDE和NTG介入99mTc MIBI心肌灌注显像均是临床检测心肌存活安全、有价值的方法 ,如以术后室壁运动改善作为存活心肌的标准 ,则LDDE有较高的特异度。     

硝酸甘油介入~(99m)Tc-MIBI心肌灌注显像检测存活心肌

目的　应用硝酸甘油 (NTG)介入99mTc -甲氧基异丁基异腈 (MIBl)SPECT心肌显像评价心肌梗死患者心肌细胞存活的情况。　方法　 2 0例心肌梗死患者分别行99mTc -MIBI静息和NTG介入心肌显像 ,并进行对比分析。　结果　 2 0例患者共有 75个心肌灌注异常节段 ,其中 3 2个节段在NTG后心肌血流灌注改善 ,呈现可逆性缺损 ,占 42 .67%。结论　NTG介入99mTc -MIBISPECT心肌显像可明显提高心肌梗死患者存活心肌细胞的检出率。     

硝酸甘油介入心肌核素显像检测存活心肌的意义

目的探讨急性心肌梗死(AMI)与陈旧性心肌梗死(OMI)心肌存活状态的差异。方法应用SPECT对63例Q波MI患者行常规99mTc-MIBI心肌显像(静息显像),隔日舌下含服NTG(1.0mg)后5分钟静注99mTc-MIBI,再行心肌显像(介入显像),其中4例患者行冠脉搭桥术(CABG),3例于CABG术后3月再行心肌显像。结果静息显像中239个节段灌注异常,NTG介入后有97个节段得到不同程度的改善,改善率为40.59%,静息显像平均得分为9.65±4.31,介入显像平均得分为7.75±4.66,两者比较差别有统计学意义(P<0.001)。3例CABG术前检测有改善的6个节段,术后均得到不同程度的改善。AMI组与OMI组1月-6月组,6月-3年组相比较,存活心肌的检出率分别为43.10%,42.80%,35.15%,虽呈逐渐下降,但无统计学意义(P>0.05)。结论NTG介入99mTc-MIBI心肌显像可明显提高存活心肌的检出率,且该方法简便易行,安全可靠。OMI患者亦有存活心肌,也可从血运重建中获益。     

硝酸甘油介入^99mTC—MIBI心肌显像判定心肌存活的意义

对35例心肌梗塞患进行^99mTC-MIBI静息心肌断层显像，间隔24h后行硝酸甘油介入心肌断层显像。静息心肌显像有103个节段心肌灌注异常，硝酸甘油入心肌显像有56个节段心肌灌注明显改善，表明硝酸甘油介入^99mTC-MIBI心肌显像对判定心肌存活具有明显临床价值。     

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.     

Acute myocardial infarction due to myocardial bridge

Myocardial bridge (MB) is regarded as a common anatomic variant rather than a congenital condition anomaly,defined as the intramyocardial course of a portion of the coronary artery.It was first mentioned by Rayman in 1737 and first described by Grainicianu in the early 1920s.The current gold standard for diagnosing     

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.     

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.     

四氢生物蝶呤对未成熟心肌保护作用及线粒体ATP酶活性的影响

目的:观察四氢生物蝾呤(BH4)对未成熟缺血再灌注心肌的保护作用及心肌线粒体ATP酶活性的影响.方法:建立幼鼠离体全心缺血再灌注模型,80只幼鼠随机分为实验组(BH4停搏液)和对照组(St.ThomasⅡ液),每组40只.测定缺血前、缺血再灌注30,60和120min时的冠状动脉流出量.分别测定两组之间不同时间点的心肌丙二醛(MDA)含量、心肌一氧化氮(NO)浓度以及心肌细胞线粒体Na ,K -ATP酶和Ca2 -ATP酶的活性.结果:BH4能显著提高冠脉流出量的恢复率,增加NO的产量,降低脂质过氧化物的产生并抑制心肌缺血再灌注后Na ,K -ATP酶和Ca2 -ATP酶活性的下降(P＜0.05).结论:BH4心脏停搏液通过增加NO的产量,保护心肌细胞线粒体ATP酶的功能,对未成熟心肌具有更好的保护效果.     

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。     

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     

MRI心肌延迟增强扫描在心肌梗死诊断中的初步应用

目的 初步评价MRI心肌延迟强化在诊断心肌梗死中的价值.方法 2005～2006年对本院9例确诊为心肌梗死的患者,8例疑诊患者进行MRI多技术扫描.结果 9例确诊患者MRI延迟增强扫描心肌都有不同程度强化.8例疑诊患者中2例心内膜下心肌梗死,2例心肌缺血,1例肥厚型心肌病伴多灶性心肌坏死,1例广泛心肌损害,2例心肌显示正常.结论 MRI心肌延迟增强扫描对冠心病急慢性心肌梗死坏死心肌诊断是准确和可靠的.     

Relation of myocardial bridge to myocardial infarction: a meta-analysis

Background Small case series have suggested an association of coronary myocardial bridge （MB） with myocardial infarction （MI）.However,the relationship between MB and major adverse cardiac events （MACE） remains largely unknown.The aim of this study was to assess the relationship between MB and MACE involving MI.Methods We performed a systematic search of MEDLINE,PreMEDLINE,and all EMB Reviews as well as a reference list of relevant articles according to the SPICO （Study design,Patient,Intervention,Control-intervention,and Outcome） criteria using the following keywords：myocardial bridging,myocardial bridge,intramural coronary artery,mural coronary artery,tunneled coronary artery,coronary artery overbridging,etc.Bibliographies of the retrieved publications were additionally hand searched.Studies were included for the meta-analysis if they satisfied the following criteria：（1） they evaluate the association of MB with cardiovascular endpoint event; （2） they included individuals with MB and those without MB; 3） they excluded individuals with obstructive coronary artery disease （CAD）.Studies were reviewed by a predetermined protocol including quality assessment.Dates were pooled using a random effect model.Results Seven observational studies that followed 5 486 patients eligible for the enrolled criteria were included from 7 136 initially identified articles.The prevalence of MB was 24.8％ （1 363/5 486）.During 0.5-7.0 years of follow-up of this cohort of population,crude outcome rates were 8.0％ in the MB group and 7.7％ in the non-MB group.The odds ratio of overall MACE and MI were 1.34 （95％ confidence interval （CI）：0.57-3.17,P=0.51,n=7 studies） and 2.75 （95％ CI：1.08-7.02,P ＜0.03,n=5 studies） respectively for subjects of MB compared to non-MB.Conclusion Relationship between MB and MI appears to be a real one,although the study did not reveal a connection of MB to MACE,suggesting whether the necessity of antiplatelet therapy needs to be further studied in a larger cohort of patients with MB prospectively.     

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。