99 Tcm-tetrofosmin与99Tcm-MIBI心肌显像的对比研究

目的　评价99Tcm 1,2 双 [双 2 乙氧乙基膦 ]乙烷 (tetrofosmin)诊断冠心病的临床价值。方法　经冠脉造影、病历资料完整的 5 3例患者 ,其中行99Tcm tetrofosmin心肌灌注显像 2 7例 ,行99Tcm MIBI心肌灌注显像 2 6例。运动负荷试验按Bruce方案进行。Tetrofosmin显像于给药后 30min行心肌断层显像 ,间隔 2 4h后作静息心肌断层显像 ,运动 静息一日法则在 4h后作静息心肌断层显像 ;MIBI显像于给药后 1～ 2h行心肌断层显像 ,48h后作静息心肌断层显像。冠脉造影采用Judkins法。结果　99Tcm tetrofosmin心肌灌注显像 ,运动、静息显像以及运动 静息一日法心肌显像均获得了清晰的心肌断层图像 ,均未发现邻近器官有明显的放射性干扰。Tetrofosmin诊断冠心病的灵敏度为 90 % ,MIBI的诊断灵敏度为 94% ,两者间差异无显著性 (P >0 .0 5 )。Tetrofosmin的检测效率为 85 .2 % ,MIBI的检测效率为88.5 % ,两者间差异无显著性 (P >0 .0 5 )。Tetrofosmin和MIBI的阳性预测值分别为 90 .0 %和 89.5 % ,诊断特异性分别为 71%和 75 %。结论　99Tcm tetrofosmin心肌显像对冠心病心肌缺血具有较高的诊断价值 ,且适用于运动 静息一日法心肌显像     

硝酸甘油介入~(99)Tc~m-MIBISPECT心肌显像对PTCA决策的影响

目的　评价硝酸甘油 (NTG)介入99Tcm 甲氧基异丁基异腈 (MIBI)SPECT心肌显像对心肌梗死患者行经皮冠状动脉腔内成形术 (PTCA)决策的影响。方法　 5 1例心肌梗死患者PTCA前 1周内行99Tcm MIBI静息和NTG介入心肌显像 ,术后 2～ 3个月内复查静息心肌显像 ,并进行对比分析。结果　 5 1例患者共 14 1个心肌灌注异常节段 ,其中术后 74个节段心肌血流灌注改善 ,治疗有效率为5 2 4 8%。术前NTG介入显像表现为可逆性缺损 79个节段 ,术后 84 81% (6 7个 )节段心肌灌注改善 ,其中有明显填充的 5 8个节段 ,术后全部灌注改善。NTG介入显像表现为不可逆性缺损的 6 2个节段 ,有 11 2 9% (7个 )节段术后心肌灌注改善。NTG介入显像检测心肌存活的准确性为 86 5 2 %。结论NTG介入99Tcm MIBISPECT心肌显像对患者行PTCA起重要的决策作用。     

99TCm-MIBI联合67Ga心肌显像诊断小儿病毒性心肌炎

目的　探讨99Tcm 甲氧基异丁基异腈 (MIBI)心肌灌注显像联合6 7Ga心肌显像诊断小儿病毒性心肌炎 (VMC)的价值。方法　 78例VMC患儿 ,其中急性期 (<6个月 ) 4 5例 ,慢性期 (>6个月) 33例 ,分别行99Tcm MIBI心肌灌注显像和6 7Ga心肌显像。结果　 4 5例急性期患儿中 31例(6 8 9% ) 99Tcm MIBI心肌灌注显像出现不同程度的放射性分布异常 ,38例 (84 4 % ) 6 7Ga心肌显像示心脏部位异常放射性浓聚 ;33例慢性期患儿中 2 3例 (6 9 7% ) 99Tcm MIBI心肌灌注显像阳性 ,6 7Ga心肌显像仅10例 (30 3% )阳性。急性期两者结果差异无显著性 (P >0 0 5 ) ;慢性期两者差异有显著性 (P <0 0 5 )。结论　99Tcm MIBI心肌灌注显像联合6 7Ga心肌显像对诊断小儿VMC及观察病情演变有较高价值。     

冠状动脉造影正常的心肌梗死患者~(99)Tc~m-MIBI心肌灌注显像

目的　探讨99Tcm 甲氧基异丁基异腈 (MIBI)心肌灌注断层显像 (MPI)对冠状动脉造影(CAG)正常的心肌梗死 (MI)患者的临床应用价值。方法　 5例患者中 4例为急性MI,1例为异常Q波原因待查 ,均经CAG证实冠状动脉正常。于CAG后 7～ 10d行运动 静息99Tcm MIBIMPI。结果　 5例患者中 4例MPI异常 (均为固定放射性缺损 ) ,1例正常。 1例异常Q波待诊患者经MPI确诊为MI。4例MPI显示的MI部位较ECG大 ;1例ECG示透壁性MI者MPI正常。随访期间 ,1例因心功能不全行室壁瘤切除术。结论　99Tcm MIBIMPI对CAG正常的MI诊断及梗死部位、程度和预后的判断有较高价值     

门控心肌显像局部室壁运动异常对判断冠状动脉狭窄程度的价值

目的　探讨99Tcm 甲氧基异丁基异腈 (MIBI)门控心肌显像可逆性局部室壁运动异常(RWMA)对判断冠状动脉 (简称冠脉 )狭窄程度的价值。方法　 116例疑诊冠心病患者 ,在行运动 静息99Tcm MIBI门控心肌显像前后 2周内进行冠脉造影 (CAG)。运动显像于运动后 15～ 2 0min内进行图像采集 ;应用 2 0节段 5分制进行室壁运动及增厚率评分。结果　用心肌显像可逆性RWMA判断狭窄程度≥ 75 %冠脉狭窄的灵敏度为 6 5 % ,特异性为 97% ;用可逆性RWMA区别严重冠脉狭窄 (≥75 % )和不严重冠脉狭窄 (<75 % )有较高的阳性预测值 (98% )。多因素分析示负荷室壁运动总积分(SSSWM)、室壁运动差分值 (SDSWM)和运动显像灌注总积分 (SSS)是濒危冠脉积分的独立危险因子。结论　根据99Tcm MIBI门控心肌显像可逆性RWMA判断严重冠脉狭窄特异性和阳性预测值较高。运动后及可逆性RWMA可提高心肌灌注显像对冠脉狭窄程度的评估价值。     

硝酸甘油介入心肌显像检测存活心肌

目的：观察硝酸甘油介入对常规静息心肌显像异常减低区存活心肌判断的作用。材料和方法:28例冠心病患者在一周内进行了Tc-99m—MIBI常规静息心肌显像及含服硝酸甘油后心肌显像．结果：在144个常规静息心肌显像中的放射性异常减低区段．有61个(42%)区段在含服硝酸甘油后显像见局部Tc-99m—MIBI摄取明显增加，其中23个区段局部放射性分布计分上升2级：同时硝酸甘油心肌显像明显提高心／肝及心／肺比值，改善了图像质量.结论：硝酸甘油介入后Tc-99m—MIBI心肌显像明确提高了常规静息心肌显像对存活心肌判断的灵敏性。     

^99Tc^m—MIBI静息心肌断层显像对年轻心肌梗死患者心肌损 …

目的：用＾９９Ｔｃ＾ｍ－甲氧基异丁基异腈（ＭＩＢＩ）静息ＳＰＥＣＴ显像评价年轻心肌死患者的心肌损伤。方法总结分析了４例年龄〈４０岁的心肌梗死患者＾９９Ｔｃ＾ｍ－ＭＩＢＩ静息心肌灌注断层显像,并与冠状动脉造影和ＥＣＧ进行比较,结果４２例年轻心肌梗死患者,９０％（３８例）心肌灌注显像异常,１０％（４例）未见明显异常,诊断灵敏度为９０％。与ＥＣＧ相比,心肌灌注显像对梗死灶定位更准确,特别是心尖和后壁梗死     

硝酸甘油介入99Tcm-MIBI SPECT心肌显像对PTCA决策的影响

目的评价硝酸甘油(NTG)介入99Tcm-甲氧基异丁基异腈(MIBI) SPECT心肌显像对心肌梗死患者行经皮冠状动脉腔内成形术(PTCA)决策的影响.方法 51例心肌梗死患者PTCA前1周内行99Tcm-MIBI静息和NTG介入心肌显像,术后2～3个月内复查静息心肌显像,并进行对比分析.结果 51例患者共141个心肌灌注异常节段,其中术后74个节段心肌血流灌注改善,治疗有效率为52.48%.术前NTG介入显像表现为可逆性缺损79个节段,术后84.81%(67个)节段心肌灌注改善,其中有明显填充的58个节段,术后全部灌注改善.NTG介入显像表现为不可逆性缺损的62个节段,有11.29 %(7个)节段术后心肌灌注改善.NTG介入显像检测心肌存活的准确性为86.52%.结论 NTG介入99Tcm-MIBI SPECT心肌显像对患者行PTCA起重要的决策作用.     

心肌灌注缺损和冠状动脉狭窄的最严重部位与随后发生的急性心肌梗死部位之间的关系

目的 :评价心肌灌注缺损、冠状动脉狭窄最严重的部位与随后发生的急性心肌梗死部位之间的关系。方法 :选择 44例因急性心肌梗死 (AMI)而住院的病人 ,男 2 6例 ,女 18例 ,45～ 78岁 ,平均 (6 5± 8.0 )岁。这些患者心肌梗死前曾作过运动负荷或潘生丁负荷心肌灌注断层显像 ,显像剂为 99Tcm - MIBI或 99Tcm- tetrofosmin。这 44例中 ,31例心肌梗死前也作了冠状动脉造影。 AMI的诊断标准为超过30 m in的胸痛 ,伴有心电图的异常 Q波或心肌酶谱异常增高 ;梗死部位由心电图确定。心肌灌注缺损、冠状动脉狭窄最严重的部位与随后发生的 AMI部…     

冠心病患者~(201)Tl和~(99)Tc~m-MIBI双核素心肌灌注显像

目的　探讨静息2 0 1 Tl 负荷99Tcm 甲氧基异丁基异腈 (MIBI)双核素心肌SPECT显像在冠心病诊断中的价值。方法　对 36例冠心病患者行2 0 1 Tl负荷 延迟再分布心肌SPECT显像 ;常规潘生丁药物负荷高峰时 ,静脉注射2 0 1 Tl111～ 14 8MBq ,15min后进行心肌显像。对 2 3例冠心病患者和 9例正常人行静息2 0 1 Tl负荷、99Tcm MIBI双核素心肌SPECT显像 ,静息状态注射2 0 1 Tl111～ 14 8MBq ,注射后5min给予潘生丁药物负荷 ,高峰时注射99Tcm MIBI 92 5MBq。 1h后行双核素显像。结果　 36例冠心病患者2 0 1 Tl负荷 延迟再分布心肌显像的阳性率为 83 33% ,2 3例冠心病患者双核素心肌显像的阳性率为 10 0 % ,两组阳性率比较差异有显著性 (χ2 =4 2 6 7,P =0 0 4 3)。 9例正常受检者均为阴性。结论双核素心肌显像对冠心病的检出率较高 ,省时、安全并可获得高质量图像 ,对冠心病诊断有较高临床价值。     

Simultaneous assessment of left ventricular wall motion and myocardial perfusion with technetium-99m-methoxy isobutyl isonitrile at stress and rest in patients with angina: comparison with thallium-201 SPECT

The newly developed technetium-99m (99mTc) isonitriles can be used for the simultaneous evaluation of ventricular function and myocardial perfusion. We compared technetium-99m hexakis-2-methoxy isobutyl isonitrile [( 99mTc] MIBI) derived first-pass left ventricular wall motion at stress and rest with simultaneous myocardial perfusion defined by [99mTc]MIBI SPECT. These results were then compared with 201TI SPECT. We examined 28 patients with coronary artery disease; 25 had a previous myocardial infarction. We found concordance between segmental wall motion and myocardial perfusion imaging in defining normal, ischemic, and infarcted myocardium in 68% and 69% of segments using [99mTc]MIBI and 201TI respectively. The best agreement between wall motion and myocardial perfusion was seen in the inferior wall, while most of the discrepancies were found at the apex. Agreement between [99mTc]MIBI and 201TI SPECT myocardial perfusion was seen in 93% of segments. Technetium-99m-MIBI appears to be an ideal radiopharmaceutical for the simultaneous evaluation of ventricular function and myocardial perfusion during stress and at rest.     

Simultaneous technetium-99m MIBI angiography and myocardial perfusion imaging

Resting first-pass radionuclide angiography (FPRNA) was performed with the myocardial perfusion agent technetium-99m MIBI. In 27 patients, it was compared with technetium-99m diethylenetriamine pentaacetic acid FPRNA. A significant correlation was present in left (r = 0.93, p less than 0.001) as well as right (r = 0.92, p less than 0.001) ventricular ejection fraction measured with both radiopharmaceuticals. In 13 patients, MIBI derived segmental wall motion was compared with contrast ventriculography. A high correlation was present (p less than 0.001), and qualitative agreement was found in 38/52 segments. In 19 patients with myocardial infarction a significant correlation was present between MIBI segmental wall motion and perfusion scores (p less than 0.001). In ten patients with a history of myocardial infarction, 18 myocardial segments demonstrated diseased coronary vessels and impaired wall motion at contrast angiography. These segments were all identified by the MIBI wall motion and perfusion study. We conclude that MIBI is a promising agent for simultaneous evaluation of cardiac function and myocardial perfusion at rest.     

Gated Tc-99m sestamibi SPECT versus stress-rest SPECT in detecting coronary artery disease: correlation with coronary angiography in patients without myocardial infarction

PURPOSE: It is possible to simultaneously evaluate wall thickening and perfusion abnormalities with radionuclide techniques that use tracers such as Tc-99m MIBI. We presumed that detection of wall thickening by gated MIBI SPECT imaging in the presence of a stress-induced perfusion defect correlates with reversibility of that defect on resting images. Therefore, the aim of our study was to analyze, in patients without myocardial infarction, resting wall thickening and stress perfusion imaging as an alternative to conventional stress-rest imaging. METHODS AND RESULTS: The patients (n = 44) underwent an exercise (n = 37) or pharmacologic (n = 7) stress protocol. All patients had previous coronary angiography within 3 months. Stress-rest MIBI SPECT and gated MIBI SPECT studies were analyzed by visual scoring. The sensitivity and specificity of segmental analysis of both stress-rest MIBI SPECT perfusion and gated MIBI SPECT studies for the overall detection of coronary artery disease were, respectively, 71% and 96%. For patient evaluation for detection of coronary artery disease, stress-rest MIBI SPECT perfusion and gated MIBI SPECT studies showed a sensitivity rate of 96% for both and specificity rates of 84% and 79%, respectively. CONCLUSIONS: Our data revealed close agreement between reversible perfusion defects on stress-rest MIBI SPECT scans and significant wall thickening on gated MIBI SPECT stress images in patients without previous myocardial infarction (95%). Gated MIBI SPECT stress, without resting studies, which provide an assessment of wall motion and wall thickening, potentially allows stress defect reversibility to be evaluated in patients without previous myocardial infarction.     

高血压病心肌灌注及硝酸甘油介入显像与室性心律失常关系的研究

目的　探讨高血压病心肌显像异常的临床意义及与心律失常的关系。方法　对 88例高血压患者行99Tcm 甲氧基异丁基异腈心肌灌注断层显像 ,对其中 5 7例显像异常者再行硝酸甘油介入心肌显像。所有患者均行Holter检查 ,冠状动脉造影 31例。结果　运动和静息显像后仍有 6 4 8%患者灌注减低 ,6 0 2 %的灌注减低节段硝酸甘油介入显示有填充或不完全填充 ,提示合并冠心病。多因素逐步回归分析表明 ,室性心律失常与心肌灌注减低的程度及左室肥厚 (LVH)呈线性回归关系。结论　心肌灌注断层显像及硝酸甘油介入心肌显像能反映高血压患者是否合并冠心病 ,并与其他高血压性病理改变所致的灌注减低相区别。高血压合并冠心病及LVH是心律失常的重要病理基础。     

99Tcm-MIBI心肌灌注显像对代谢综合征患者并发冠心病的评价

目的 探讨核素心肌灌注显像对代谢综合征患者并发冠心病的诊断价值.方法 回顾性分析251例[男179例,女72例,年龄(59±10)岁]代谢综合征患者99Tcm-甲氧基异丁基异腈(MIBI)心肌灌注显像的结果,与冠状动脉造影进行比较,计算99Tc-MIBI心肌灌注显像诊断冠心病的灵敏度、特异性和准确性.结果 在251例代谢综合征患者中,163例(65%)患者冠状动脉造影示有狭窄病变,99Tcm-MIBI心肌灌注显像检出心肌缺血或心肌梗死116例;88例冠状动脉造影阴性患者中,82例心肌灌注显像结果正常;99Tcm-MIBI心肌灌注显像诊断冠心病的灵敏度为71%(116/163),特异性为93%(82/88),阳性预测值为95%(116/122),阴性预测值为64%(82/129),准确性为79%(198/251).诊断单支、双支和三支冠状动脉病变患者的灵敏度分别为58%(36/61),61%(22/36)和87%(57/66).结论 99Tcm-MIBI心肌灌注显像对检测代谢综合征患者有无并发冠心病有重要的应用价值.     

The value of Tc-99m MIBI SPECT during isosorbide dinitrate infusion in assessment of viable myocardium in patients with myocardial infarction

Tc-99m MIBI myocardial SPECT has shown promise for evaluation of coronary artery disease. But its role in predicting myocardial viability is still under investigation. The purpose of this study was to evaluate the value of Tc-99m MIBI myocardial SPECT during isosorbide dinitrate (ISDN) infusion in the assessment of myocardial viability. Thirty-seven patients with previous myocardial infarction (the infarct age ranged from ≤ 30 days to 900 days) were studied, of them 13 patients had Tc-99m MIBI studies before and after coronary artery bypass grafting (CABG). The results showed that out of 134 segments with hypoperfusion at resting SPECT, 56 segments (41.8%) had an increase in Tc-99m MIBI uptake during ISDN infusion. Among them, 17 segments (30.4%) were normalized, 6 segments (10.7%) were significantly improved and 33 segments (58.9%) were improved. The degree of improvement in perfusion was related to the age of the myocardial infarction. In 13 patients with CABG, of 31 segments with improvement in perfusion post CABG, 25 segments (80.6%) showed perfusion improvement during ISDN infusion, and of 28 segments with improved wall motion post CABG, 23 segments (82.1 %) showed improvement in perfusion during ISDN infusion. Tc-99m MIBI SPECT during ISDN infusion may therefore be a useful approach for assessing myocardial viability.     

Measurement of left ventricular ejection fraction from gated technetium-99m sestamibi myocardial images

Left ventricular ejection fraction (LVEF) and single-photon emission tomographic (SPET) imaging of the myocardium can be performed after a single technetium-99m sestamibi (MIBI) injection. Sixty patients underwent SPET imaging with MIBI. Immediately after SPET acquisition ECG-gated^99mTc-MIBI perfusion images were acquired using 24 planar images per R-R interval. A new method for measurement of LVEF from the ECG-gated 99mTc-MIBI perfusion images was developed. To validate the method, LVEF derived from MIBI perfusion images was compared with that from conventional radionuclide ventriculography in all 60 patients. Forty patients had evidence of myocardial infarction and 20 had normal perfusion on MIBI imaging. There was no statistically significant difference between LVEF computed from^99mTc-MIBI perfusion images and that from radionuclide ventriculography (r=0.7062,P<0.001). There was little difference associated with the technique (intraobserver variabilityr=0.9772,P<0.001). Interobserver variability was also good (r-0.8233,P<0.001). LVEF from^99mTc-MIBI perfusion images can be obtained at the same time as assessment of myocardial perfusion and in the same orientation and metabolism of the myocardium, thereby permitting more accurate and realistic prognosis and diagnosis in patients with coronary artery disease.     

Comparison of stress-only vs. stress/rest with technetium-99m methoxyisobutylisonitrile myocardial perfusion imaging.

Unlike conventional thallium-201 myocardial imaging, technetium-99m methoxyisobutylisonitrile (MIBI) requires separate stress and rest injections. We prospectively studied 148 consecutive patients referred for myocardial perfusion studies to determine the diagnostic value of rest images once normal exercise or dipyridamole tomographic images had been obtained. In patients referred with no history of previous myocardial infarction in whom the diagnosis of coronary artery disease was suspected, 45 of 109 (41%) patients had normal stress tomographic images. Obtaining rest images did not alter the final interpretation in any of these cases. From this we infer that in patients with normal images after exercise or dipyridamole administration and no past history of myocardial infarction, 99mTc-MIBI rest images are not required. This provides several advantages including increased speed of diagnosis, decreased patient radiation exposure, improved cost efficiency and decreased demand on tomographic camera time.     

腺苷与运动负荷心肌灌注显像诊断不典型胸痛心肌缺血的临床价值

目的评价腺苷和运动负荷心肌灌注显像诊断不典型胸痛患者心肌缺血的价值。方法不典型胸痛患者67例行腺苷负荷心肌灌注显像，81例行运动负荷心肌灌注显像，结果分别与冠状动脉（简称冠脉）造影比较，得到显像诊断冠心病心肌缺血的灵敏度、特异性和准确性。结果腺苷负荷心肌灌注显像组67例中，23例冠脉造影有狭窄病变，腺苷负荷心肌灌注显像检出可逆性灌注异常即诊断心肌缺血16例，44例冠脉造影阴性者中，腺苷心肌灌注显像正常41例。腺苷负荷心肌灌注显像诊断冠心病心肌缺血的灵敏度为70％，特异性93％，准确性85％。运动负荷心肌灌注显像组81例中，31例冠脉造影阳性，运动负荷心肌灌注显像检出心肌缺血22例，50例冠脉造影阴性者中，运动负荷心肌灌注显像正常48例。运动负荷心肌灌注显像诊断冠心病心肌缺血的灵敏度为71％，特异性96％，准确性86％。结论腺苷或运动负荷心肌灌注显像出现可逆性灌注异常对诊断不典型胸痛患者冠心病心肌缺血有重要意义。