~(99m)Tc-MIBI心肌断层显像在冠心病诊断中的应用

目的探讨99m锝-甲氧异腈(99mTc-MIBI)心肌血流灌注断层显像对冠心病的诊断价值及临床应用。方法56例患者行99mTc-MIBI心肌血流灌注断层显像,并在3周内行冠脉造影检查,分析对比心肌断层显像与冠脉造影的诊断结果。结果以冠脉造影为标准,99mTc-MIBI心肌血流灌注断层显像对冠心病诊断的敏感性为89.36%,特异性为77.78%,阳性预测值为95.46%,阴性预测值为58.33%,与冠状动脉造影对比,差异无显著性(P>0.05)。结论99mTc-MIBI心肌血流灌注断层显像对冠心病有较高的诊断价值,是一种方便、快捷、无创的检查方法。     

硝酸甘油介入心肌显像分析程序综合应用的诊断价值

目的 探讨心肌SPECT的分析程序结合硝酸甘油（NTG）介入对检测存活心肌的应用价值。方法 对33例冠心病患者（CAD）及20例对照者进行^99mTc-MIBI心肌显像及NTG介入显像。11例CAD患者行冠状动脉搭桥术（CABG）后复查静息心肌显像。分别应用常规分析、三维心肌立体显像、圆周剖面曲线、多感兴趣区放射性计数、极坐标靶心图等进行综合诊断。结果 NTG介入后CAD患者灌注减低区的填充面积均值为14．19％。NTG介入前后的灌注面积有显著性差异（P＜0．05）。综合分析法检出的存活心肌节段明显高于常规分析（P＜0．05）。以CABG术后显像为对照标准,NTG介入综合判断活力心肌的阳性预测值为87．7％。结论 运用多种指标综合分析NTG介入显像能提高存活心肌的检出率。     

99mTc-MIBI心肌灌注断层显像与冠状动脉造影的对比研究

目的　探讨99mTc-甲氧基异丁基异腈 (MIBI)心肌灌注断层显像对冠心病的诊断价值。方法　 34例99mTc -MIBI心肌灌注断层显像与冠状动脉造影 (CAG)结果进行对比。结果　99mTc-MIBI心肌灌注断层显像对冠心病诊断的敏感性为 91.7%,特异性为 80 .0 %。对右冠状动脉、左冠状动脉前降支和左冠状动脉回旋支的诊断阳性率分别为 85 .7%、92 .3%和 71.4%,总的阳性预测值为 91.7%,阴性预测值为 80 .0 %。结论　99mTc -MIBI心肌灌注断层显像对冠心病的诊断有较大价值。     

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。     

99mTc-MIBI心肌灌注显像诊断2型糖尿病心肌缺血的临床价值

目的 探讨^99mTc-MIBI心肌灌注断层显像诊断2型糖尿病无症状心肌缺血的价值。方法 对60例2型糖尿病患者行^99mTc-MIBI心肌灌注断层显像，与冠状动脉造影结果进行对比分析，并对2型糖尿病无症状心肌缺血患者的血清指征进行分析。结果 ^99mTc-MIBI心肌灌注断层显像对2型糖尿病无症状心肌缺血诊断的敏感性89．3％，特异性84．4％，准确性86．7％，心肌异常显像的阳性率43．3％，CAG阳性率45％。结论 ^99mTc-MIBI心肌灌注断层显像对2型糖尿病无症状心肌缺血的敏感性高，与CAG结合可提高其诊断准确率。     

99mTc-MIBI心肌灌注显像预测经皮冠状动脉介入治疗术后疗效

目的:观察经皮冠状动脉介入治疗(PCI)术前后99mTc-MIBI心肌灌注显像的变化,筛选PCI疗效可靠的预测指标.方法:48例心肌梗死患者PCI前分别行静息/运动/硝酸甘油介入99mTc-MIBI心肌灌注显像,PCI术后1～2周复查运动和静息99mTc-MIBI心肌灌注显像,以(术后静息心肌灌注显像缺损计分-术前运动心肌灌注显像缺损计分)/术前运动灌注缺损计分作为PCI术的疗效,以(术前静息心肌灌注缺损计分-术前运动心肌灌注缺损计分)/术前运动灌注缺损计分作为术前有功能存活心肌的指标、以(术前运动心肌灌注缺损计分-术前硝酸甘油心肌灌注缺损计分)/术前运动灌注缺损计分作为潜在有功能存活心肌的指标、以(术前静息心肌灌注缺损计分-术前硝酸甘油心肌灌注缺损计分)/术前静息灌注缺损计分作为药物可改善存活心肌指标,后三者分别与PCI术后疗效作直线相关分析,筛选PCI疗效可靠的预测指标.结果:PCI后运动和静息心肌灌注显像比术前均明显改善(P＜0.01).相关分析结果表明,后三者与前者相关系数分别为:r1=0.63,P＜0.01;r2=0.94,P＜0.000 1;r3=0.92,P＜0.000 1,提示潜在有功能存活心肌与PCI疗效相关性最佳.结论:心肌梗死患者PCI前进行静息/运动/硝酸甘油介入99mTc-MIBI心肌灌注显像很有必要,潜在有功能存活心肌可作为筛选PCI患者和预测PCI疗效的可靠指标.     

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。     

硝酸甘油介入心肌灌注断层显像估测心肌存活的研究

了解冠心病人心肌存活情况对冠心病的治疗及预后有重要的价值。本研究通过对 4 4例患者行静息和硝酸甘油介入心肌断层显像 ,并做半定量分析 ,探讨硝酸甘油介入心肌灌注断层显像对心肌存活的诊断价值。1　资料与方法1 1　病例选择 　 4 4例有典型病史、心肌酶学变化和心电图表现的心肌梗死患者 (发病 3天～ 6个月 ) ,其中男 3 9例 ,女 5例 ,平均年龄 ( 53± 8 6)岁。所有的患者均行静息和硝酸甘油介入心肌断层显像。1 2　检查方法 　静息显像静脉注射99ｍＴｃ ＭＩＢＩ(甲氧基异丁基异腈 ) 74 0ＭＢｑ ,3 0分钟后吃脂肪餐 ,90分钟用ＺＩＲ…     

腺苷负荷心肌灌注显像在冠心病中应用的临床研究

目的研究腺苷负荷心肌灌注显像(MPS)与冠状动脉血管造影(CAG)的准确性及两者联合应用在评价冠状动脉病变及心肌缺血情况中的价值。方法对32例临床疑诊冠心病的患者先予静脉泵注腺苷注射液[剂量为0.14mg/(kg·min)]6min,注射3 min时静脉注入核素显像剂99mTc-MIBI925MBq,1 h后行心肌灌注断层显像,若显像异常,次日行静息心肌灌注显像。所有患者2周内行冠状动脉血管造影术检查。将腺苷负荷心肌灌注显像与冠状动脉造影结果进行对比分析,评价冠状动脉病变及心肌缺血情况。结果 32例患者中,14例冠状动脉造影显示为冠状动脉狭窄性病变,其中单支病变7例,二支病变4例,三支病变3例,腺苷负荷心肌灌注显像12例为阳性,2例阴性;18例冠状动脉造影显示未见明显狭窄,其中4例为壁冠状动脉,2例为冠状动脉慢血流,腺苷负荷心肌灌注显像为14例阴性,4例为阳性。腺苷负荷心肌灌注显像诊断冠状动脉阻塞性病变的敏感性为85.71%,特异性为77.78%,阳性预测值为75%,阴性预测值为87.5%,准确性为81.25%。结论腺苷负荷心肌灌注显像与CAG结果具有较好的一致性,两者联用能充分了解冠状动脉病变及心肌缺血情况,有利于临床治疗的选择。     

腺苷负荷实验心肌灌注核素显像在冠心病中的临床价值

目的 评价腺苷负荷试验心肌灌注显像诊断冠心病的敏感性、准确性、特异性. 方法 对132例临床疑诊冠心病患者,静脉泵入腺苷,剂量为140 g/(kg·min),用药时间6 min.泵入过程中,行心电监测,观察患者的症状、血压和心率.于泵入腺苷3 min末,静脉注射核素显像剂99m锝-甲氧基异丁基异腈核素显像(99mTc-MIBI)925 MBq,1.5 h后行心肌灌注断层显像,若显像异常,次日行静息心肌显像.所有患者行冠状动脉造影. 结果 在132例患者中,冠状动脉造影阳性87例,阴性45例,心肌核素显像阳性85例,阴性47例,两种检查结果 一致的病例数为108例.心肌核素显像假阳性的病例为11例,假阴性为13例.腺苷负荷试验心肌灌注显像诊断冠心病的敏感性为85.1%(74/87)、特异性为75.6%(34/45)、准确性为81.8%(108/132). 结论 腺苷负荷试验心肌核素显像对于冠心病诊断具有重要的临床应用价值.     

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。     

Placebo or trimetazidine (99m)Tc tetrofosmin myocardial SPECT and low-dose dobutamine echocardiography in hibernating myocardium

BACKGROUND: Trimetazidine (TMZ) improves (99m)Tc sestamibi uptake in myocardial single photon emission tomography (SPECT). This study compared TMZ (99m)Tc tetrofosmin SPECT and low-dose dobutamine echocardiography (LDDE) as predictors of functional recovery of hibernating myocardium after coronary revascularization. METHODS: Thirty-one patients with prior myocardial infarction and left ventricular dysfunction underwent coronary angiography, LDDE, placebo SPECT and TMZ SPECT. Echocardiographic follow-up was obtained at 2/6 months; the clinical follow-up lasted 2 years. RESULTS: Twenty-three (74.2%) patients (195 dysfunctioning left ventricular segments) were revascularized. TMZ improved (99m)Tc tetrofosmin uptake (p = 0.0001) as well as LVEF at gated SPECT (p = 0.04). At 2-months, sensitivity, specificity, positive predictive value (PPV) and negative predictive value (NPV) were calculated (LDDE 71.9, 78.7, 71, 79.5; placebo SPECT 66.2, 75.6, 65.4, 76.3; TMZ SPECT 79.2, 67.7, 61.6, 83.3, respectively). The specificity improved in placebo and TMZ SPECT (82.1 and 78.7%) at 6-months follow-up. Two patients (2/23) with hibernating myocardium treated with revascularization and three (3/4) treated medically died a cardiac death (p = 0.0016, log rank 12.89). None (0/4) without viability died during the 2-year follow-up (p = 0.6, log rank 0.28). CONCLUSIONS: The addition of TMZ to (99m)Tc tetrofosmin SPECT improved diagnostic accuracy. The importance of hibernating myocardium revascularization was confirmed.     

ATP负荷试验~(99m)Tc-MIBI心肌显像对冠心病诊断的临床价值

目的探讨ATP负荷试验99mTc-MIBI心肌显像对冠心病诊断的临床价值。方法对83例确诊或可疑冠心病行ATP负荷试验99mTc-MIBI心肌显像和静息显像,1周后行冠脉造影(SCA)进行研究对照。结果ATP负荷试验99mTc-MIBI心肌显像诊断冠心病敏感性为93.8%(60/64),特异性为84.2%(16/19),符合率为91.5%(76/83);静息心肌显像敏感性为76.6%(49/64),特异性为68.4%(13/19),符合率为74.7%(62/83)。结论ATP负荷试验99mTc-MIBI心肌显像,提高了对冠心病的诊断率,对诊断冠心病具有重要意义。     

Clinical evaluation of 99mTc-MIBI myocardial tomography for detecting coronary artery disease.

To evaluate the clinical efficacy of 99mTc-MIBI myocardial tomography for detecting coronary artery disease, 34 consecutive patients who underwent both 99mTc-MIBI study and coronary arteriography were included in the present study. Ten without and 24 with significant coronary artery disease were documented by coronary arteriography. The overall sensitivity and specificity of 99mTc-MIBI study for detecting coronary artery disease were 91.8% (22/24) and 80.0% (8/10), respectively. In subset studies, 16 of 17 (94.1%) patients with previous myocardial infarction and 6 of 7 (85.7%) patients with significant CAD but without MI were identified as abnormal. Reversible perfusion abnormalities were shown in 4 of 5 patients undergoing both exercise and rest studies. Rest perfusion abnormalities were shown in 2 patients with unstable angina pectoris who underwent only rest study. In conclusion, 99mTc-MIBI myocardial tomography provides a reliable method for detecting coronary artery disease. Rest study has high sensitivity for identifying patients with MI, and exercise/rest study can identify patients with significant CAD but without MI.     

Comparison of 99mTc-methoxyisobutylisonitrile myocardial single-photon emission computed tomography and electron beam computed tomography for detecting coronary artery disease in patients with no myocardial infarction

Background Previous studies have compared single-photon emission computed tomography (SPECT) and electron beam computed tomography (EBCT) in detection of coronary artery disease (CAD) in patients with myocardial infarction (MI). The purpose of this study was to compare SPECT with EBCT in detection of CAD in patients with no MI.Methods One hundred and forty-seven patients with suspected CAD underwent stress-rest 99mTc-methoxyisobutylisonitrile (99mTc-MIBI) myocardial SPECT, cardiac EBCT and coronary angiography (CAG) within one month. Of them, 73 patients (aged 52.6±10.6 years old) with no history of MI were included in this study. Coronary artery calcium (CAC) was defined as a CT value ≥130 HU within the boundary of coronary artery on EBCT. Results There were 35 and 38 patients with or without CAD according to CAG. Ninety-six percent of the patients with abnormal SPECT and CAC had a coronary arteries stenosis ≥50%, and 90.9% patients with normal SPECT and EBCT showed no CAD. The sensitivity of SPECT and EBCT in detection of CAD was comparable, and the specificity of SPECT (92.1%) was significantly higher than that of EBCT (55.3%) (P&lt;0.005). For the detection of individual coronary artery stenosis, both sensitivity and specificity of SPECT (75.0% and 93.7%) were significantly higher than those of EBCT (53.3% and 76.7%) (P&lt;0.025 and P&lt;0.005, respectively). In patients without chest pain, the sensitivity and specificity of SPECT (76.9% and 91.4%) were significantly higher than those of EBCT (23.1% and 69.0%) in detection of a coronary artery stenosis of ≥50% (P&lt;0.01 and P&lt;0.005, respectively). However, in patients with chest pain, both sensitivity and specificity of SPECT were comparable to those of EBCT. In patients ≤45 years old, the sensitivity of SPECT (77.8%) was significantly higher than that of EBCT (27.8%) in assessing a coronary artery stenosis of ≥50% (P&lt;0.005), and the specificity of SPECT was comparable to that of EBCT. In patients &gt;45 years old, the specificity of SPECT (94.3%) was significantly higher than that of EBCT (70.5%) (P&lt;0.005), and the sensitivity of SPECT was comparable to that of EBCT. Conclusion 99mTc-MIBI myocardial perfusion SPECT has higher accuracy than that of EBCT in detection of CAD in patients without MI.     

99mTc-甲氧基异丁基异腈心肌断层显象诊断无症状性心肌缺血

采用99mTc-MIBI 对心肌进行单光子发射性计算机断层显象,观察72例。其中:冠心组18例;可疑冠心组22例;单纯高血压组16例;对照组16例。受检者进行运动显象和静态显象,然后进行图象重建比较。结果:（1）对照组全部正常;（2）冠心组全部异常,其中心肌梗塞者图象显示缺血区为完全缺     

^99mTc—甲氧基异丁基异腈心肌断层显象诊断无症状性心肌缺血

采用^99mTc-MIBI对心肌进行单光子发射性计算机断层显象，观察72例。其中，冠心组18例，可疑冠心组22例；单纯高血压组16例；对照组16例。受检者进行运动显象和静态显象，然后进行图象重建比较。结果：（1）对照组全部正常；（2）冠心组全部异常，其中心肌梗塞者图象显示缺血区为完全缺损，心绞痛为明显稀疏和完全缺损。完全缺损者临床及体表心电图均无心肌梗塞表现；（3）可疑冠心组16／22异常；（4）单纯高血压组8／16有可逆性稀疏或轻度稀疏。缺血区域以前壁常见。本法较静息心电图，运动心电图及二维超声心动图敏感。