利用核素99mTc-sestamibi运动心肌显像评价冠状动脉PTCA及PTCA联合stent术后再狭窄

目的　通过分析99mTc sestamibi核素运动心肌灌注断层显像 (SPECT)评价冠心病患者冠状动脉PTCA疗效。方法　 4 5例冠心病患者 ,PTCA术后 1～ 2 4个月 ,静脉注射放射性示踪剂99mTc sestamibi,定性观察运动和静态心肌血流灌注情况 ,并行冠状动脉造影 ,利用 χ2 检验等评价冠心病患者单纯PTCA术与PTCA结合stent支架介入治疗疗效和运动心肌显像判断冠状动脉再狭窄情况。结果　①PTCA术后 (包括Stent支架介入治疗 ) ,约 2 6 7%的患者出现术后再狭窄 ,并且再狭窄高峰时间发生在术后 2～ 3个月之内 ;②单纯PTCA术后冠脉血管再狭窄占狭窄总数 83 3% ,PTCA结合Stent支架介入治疗后血管再狭窄约占狭窄总数 16 7% ,两种方法有显著性差异 (P <0 .0 5 ) ;③以冠状动脉造影为参照 ,99mTc sestamibi运动心肌断层显像判断术后冠脉再狭窄灵敏性和特异性分别为 76 9%和 95 0 %。结论　99mTc sestamibi运动心肌灌注断层显像可用于评价PTCA或 /和stent介入治疗。     

~(99)Tc~m-MIBI心肌显像在检测“罪犯”血管中的作用

目的　评价 99Tcm -甲氧基异丁基异腈 (MIBI)心肌灌注断层 (SPECT)显像在检测“罪犯”血管中的作用。方法　选择冠状动脉造影证实有多支血管病变并成功进行经皮腔内冠状动脉成形术 (PTCA)血流重建治疗的冠心病患者 5 2例。PTCA术前进行运动、静息、静脉滴注硝酸甘油介入 99Tcm - MIBI心肌显像 ,明确缺血与存活心肌数量最多的部位 ,以对应支配该部位的病变血管确定为“罪犯”血管。以术后疗效为标准 ,验证其准确性。结果　 5 2例中 ,冠状动脉造影发现病变血管 12 5支 ,心肌显像确定“罪犯”血管 5 2支。临床对确定的“罪犯”血管进行相应的血流重建治疗 ,随访均有良好疗效。结论　运动、静息、静脉滴注硝酸甘油介入 99Tcm- MIBI心肌显像检测“罪犯”血管准确可靠 ,实用可行     

急性心肌梗死后硝酸甘油介入心肌显像预测血管重建术后心肌灌注改善的研究

目的 :探讨硝酸甘油介入心肌显像预测急性心肌梗死血管重建术后心肌灌注改善的准确率。方法 :对 2 4例急性心肌梗死患者进行 7天或 11天随访行硝酸甘油介入99m锝—甲氧基异丁基异腈 (99mTc MIBI)心肌显像与经皮冠状动脉腔内成形术 (PTCA)。采用肉眼观察法与放射性计数法进行预测血管重建术后心肌灌注改善分析。术后 3个月随访复查静息99mTc MIBI心肌显像 ,作为判断硝酸甘油介入血管重建术后心肌灌注改善的金标准。结果 :硝酸甘油介入99mTc MIBI心肌显像肉眼观察法与放射性计数法对预测血管重建术后心肌灌注改善的敏感性分别为 5 7%与 65 % ,特异性各为 89%与 90 % ,准确率各为 66%与 73 % ,阳性预测值各为 91%与 93 % ,阴性预测值各为49%与 5 4%。结论 :硝酸甘油介入99mTc MIBI心肌显像是预测心肌梗死血管重建术后早期心肌灌注改善较为准确的方法。     

腺苷负荷试验心肌灌注显像诊断冠心病的临床价值

目的　评价腺苷负荷试验心肌灌注显像诊断冠心病的准确性。方法　对 89例临床疑诊冠心病患者 ,分别静脉注射腺苷 ,剂量为 14 0 μg·kg-1·min-1,用药时间 6min(总剂量为 0 8mg/kg) ,注射过程中 ,行心电监测 ,观察患者的症状、血压和心率 ,于注射腺苷 3min末 ,静脉注射核素显像剂99mTc MIBI 92 5MBq ,1h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 89例患者中 ,31例冠状动脉造影显示明显的冠状动脉狭窄病变 ,其中单支病变 10例 ,二支病变 11例 ,三支病变 10例。累及左前降支 2 8支 ,左回旋支 18支 ,右冠状动脉 16支 ,左主干 2支。腺苷负荷试验心肌灌注显像诊断冠心病的敏感性为 71%、特异性为 91%、阳性预测值81%、阴性预测值 84 %、准确性为 84 %。诊断单支、二支和三支冠状动脉病变患者的敏感性分别为5 0 %、73%、90 %。腺苷负荷试验心肌灌注显像判断血管病变的敏感性 77%、特异性 96 %、准确性 92 %。结论　腺苷负荷心肌灌注显像诊断冠心病敏感性及特异性均较高 ,具有重要的临床应用价值。     

~(99m)Tc-MIBI门控心肌灌注断层显像检测冠心病的准确性

目的　评价 99m Tc- MIBI门控心肌灌注断层显像估价冠心病 (CAD)的准确性 ,以及门控心肌灌注断层显像显示心肌损害与冠脉造影的关系。方法　对 93例受检者进行了运动 /静息 99m Tc- MIBI门控心肌灌注断层显像 ,其中 47例有冠脉造影检查 ,冠状动脉狭窄 >50 %为 CAD诊断标准。结果　检测 CAD的灵敏度为 84.84% ,特异性为 85.71 % ,准确性为 92 .0 0 %。正常人组的正常符合率 94%。检测 LAD病变的灵敏度为84.62 % ,LCX为 77.77% ,RCA为 85.71 %。检测 L AD病变的准确性 79% ,LCX为 77% ,RCA为 82 %。 1 2例冠脉造影显示 50 %～ 70 %狭窄者与心肌灌注显像的相关性较差 (r=0 .33,P=NS)。 2 1例冠脉造影显示 >70 %狭窄者与心肌灌注显像有良好的相关性 (r=0 .0 5,P<0 .0 5)。结论　 99m Tc-MIBI门控心肌灌注断层显像可以准确地检测冠心病 ,在避免冠脉造影检查风险方面 ,对老年病人更有实际应用价值     

运动试验99mTc-MIBI心肌灌注断层显像诊断冠心病的临床评价

目的评价运动试验99mTc-MIBI心肌灌注断层显像对冠心病的诊断价值。方法对160例病人同时进行冠状动脉造影及运动试验99mTc-MIBI心肌断层显像。结果运动试验99mTc-MIBI心肌断层显像诊断冠心病的敏感性为91.1%,特异性为87.5%。对冠状动脉单支、双支、三支病变组病人诊断的敏感性分别为83.3%、93.8%和100.0%。结论运动试验99mTc-MIBI心肌断层显像对判断心肌缺血有较高的临床应用价值。     

149例核素心肌灌注SPECT与冠状动脉造影对照的研究

目的运动-静态核素心肌灌注影像对冠心病诊断灵敏度、特异性和准确性评价。方法149例核素心肌血流灌注显像，123例运动-静态心肌显像，（99mTc－MIBI103例，201TI20例），26例心肌梗塞者仅静态99mTc－MIBI心肌显像，采用运动-静态心肌断层影像定性分析和Bulls－eye定量分析，以双盲法回顾性病例分析，与冠状动脉造影结果对照。结果核素心肌灌注显像对冠心病诊断灵敏度90．l％，特异性82．3％，准确性86．5％，阳性预测率85．8％，阴性预测率87．5％，假阳性率17．6％，假阴性率9．8％；单支、双支、三支血管病变心肌显像灵敏度分别为94．5％、85．0％、87．5％；冠状动脉血管狭窄50％-75组与>75%，心肌灌注缺血组之间显著性差异（t=6．35，P＜0．05）。结论运动-静态核素心肌灌注显像是灵敏和准确的评价局部心肌血供和活体心肌功能影像检查方法。     

经皮腔内冠状动脉成形术后的临床及冠状动脉造影随访

我国目前对经皮腔内冠状动脉成形术(PTCA)术后再狭窄的资料报道较少.本研究对592例PTCA成功的病人(男503例、女89例,平均年龄58.4±9.1岁)进行术后临床及冠状动脉造影随访.记录临床症状的复发,Holter动态心电图监测,次极量心电图运动试验和~(99m)Tc-MIBI动态心肌灌注显像手术后3个月、6个月和半年的结果.其中62例病人平均手术后10.4±7.6个月进行冠状动脉造影随访.并以冠状动脉造影的结果将此62例病人分为再狭窄组(35例)和无再狭窄组(27例),观察心绞痛症状和三种无创性检查对再狭窄预测的特异性和敏感性.结果表明:心绞痛症状、Holter动态心电图、次极量心电图运动试验和~99mTc-MIBI心肌灌注显像对再狭窄诊断的特异性和敏感性分别为75.7%和72.0%;71.4%和86.7%;66.7%和73.1%;76.5%和83.3%.如果结合临床症状和三种无创性检查组成综合缺血指标,对PTCA术后再狭窄诊断的特异性和敏感性可进一步提高,分别为85.2%和92.9%.本文对PTCA术后临床症状,无创性检查和冠状动脉造影的随访可能对今后国内大规模临床随访提供有益的参考.     

99mTc-MIBI运动-静息心肌灌注显像对经皮冠状动脉腔内成形术术后患者的预后估价

目的　本研究旨在评估运动 静息心肌灌注显像对冠状动脉腔内成形术 (PTCA)后患者预后的预测价值。方法　对 16 0例PTCA术后行99mTc 甲氧异丁基异腈 (MIBI)运动 静息心肌灌注显像的患者 ,随访 (36± 2 8)个月。结果　随访期间 ,34例 (2 1.3% )患者发生心脏事件 ,其中心肌显像提示的心肌缺血组 (n =4 3)心脏事件发生率为 6 2 .8% ,明显高于心肌梗死组 (n =32 ,12 .5 % ,χ2 =19.3,P <0 .0 0 0 1) ,而且也明显高于心肌显像正常组(n =85 ,3.5 % ,χ2 =5 7.4 4 ,P <0 .0 0 0 1)。心肌缺血组的无心脏事件生存率在 1年 ,3年 ,5年和 10年分别为 5 6 % ,32 % ,2 6 %和 2 6 % ,而正常组在相同时间内的无心脏事件生存率为 99% ,97% ,94 %和 94 %。多元线性分析显示 ,可逆性心肌灌注缺损节段是预测PTCA术后发生心脏事件的最重要的独立危险因子 (RR =5 .13,P <0 .0 0 0 1)。结论　99mTc MIBI运动 静息心肌灌注显像对PTCA术后患者的预后有重要的预测价值     

硝酸甘油介入99 mTc-MIBI心肌断层显像对存活心肌的评价

为评价硝酸甘油（NTG）介入99m锝-甲氧基异丁基异脯（99mTc－MIBI）心肌显像估测存活心肌的价值，对24例心肌梗死病人不同日行两种方案的99mTc－MIBI心肌显像：一种在静息状态进行，另一种在舌下含服NTG0．6mg后进行。8例经皮腔内冠状动脉成形术（PTCA）的病人术后2～4周随访了99mTc－MIBI静息显像。结果显示，99mTc－MIBI静息显像有118个心肌节段摄取正常，98个摄取异常（16个节段摄取减低，82个摄取严重减低），在98个摄取异常的节段中，NTG介入99mTc－MIBI显像有39个（39．80％）节段摄取增加。8例行PTCA的病人，NTG介入99mTC－MIBI显像证实为可逆性缺损的心肌节没有84．21％在PTCA后心肌灌注改善（存活心肌），而为NTG介入99mTc－MIBI显像证实为不可逆性缺损的心肌节段有88．24％在PTCA后心肌灌注无改善。NTG介入99mTc－MIBI显像预测存活心肌的准确性为86．11％。表明，NTG介入99mTc－MIBI心肌显像可提高缺血但存活心肌的检出率。     

小剂量多巴酚丁胺超声心动图与硝酸甘油介入~(99m)Tc-MIBI的心肌灌注显像估测存活心肌

目的　探讨小剂量多巴酚丁胺超声心动图 (LDDE)与含服硝酸甘油 (NTG)介入99mTc 甲氧基异丁基异睛 (MIBI)的心肌灌注显像在心肌存活估测中的价值。方法　对 17例心肌梗死患者分别行静息 NTG介入99mTc MIBI和小剂量多巴酚丁胺超声心动图的检查 ,经皮冠状动脉腔内成形术或冠状动脉旁路移植术后一个月重复基础超声心动检查 ,并进行对比分析。结果　 17例患者于基础超声心动检查 ,共有 94个心肌节段运动异常 ,在其中 5 0个低动力心肌节段中 ,两种方法一致性节段 2 9个 (5 8% ,P >0 .0 5 ) ;在 44个无动力心肌节段中两种方法一致性节段 16个 (36 % ,P<0 .0 5 )。两种方法对低动力心肌节段功能恢复的预测差异无显著性意义 (P>0 .0 5 ) ;而对无动力心肌节段 ,LDDE较NTG介入 99m　Tc MIBI心肌灌注显像有较高的特异性 (90 .9%vs 6 4.7% ,P <0 .0 5 )和较低的敏感性 (6 3.6 %vs88.9% ,P <0 .0 5 )。对整个运动障碍节段功能恢复的预测 ,LDDE较NTG介入99mTc MIBI心肌灌注显像有较高的特异性 (87.2 %vs 6 8.2 % ,P <0 .0 5 )。结论　两种方法对低动力心肌节段的预测有良好的一致性 ,LDDE对整个运动障碍节段功能恢复的预测有较高的特异性。     

~(99m)锝-甲氧基异丁基异腈心肌灌注显像对冠心病诊断的临床评价-同冠状动脉造影对比

目的探讨~（99m）锝-甲氧基异丁基异腈心肌灌注显像对冠心病诊断价值。方法对126例怀疑冠心病的患者进行了结合运动试验和多巴酚丁胺负荷的~（99m）锝-甲氧基异丁基异腈心肌灌注显像（~（99m）Tc－SPECT），并同冠状动脉造影检查对比研究。结果显示~（99m）Tc－MIBI-SPECT对冠心病的诊断敏感性和特异性分别为91．2％和88．6％；对单支、双支和三支冠脉病变的敏感性分别为88．5％、92．3％和100％；对前降支、回旋支和右冠状动脉病变的检出率分别为92．6％、85．7％和81．8％。结论结合运动试验和多巴酚丁胺负荷的~（99m）Tc－MIBI－SPECT是一种对冠心病诊断和定位有较大价值的检查方法，且具有无创伤性、高敏感性和特异性。     

硝酸甘油介入~(99m)Tc-甲氧基异丁基异腈心肌灌注断层显像评估存活心肌

目的　评估静息及硝酸甘油介入99mTc 甲氧基异丁基异腈 (99mTc MIBI)心肌灌注断层显像在存活心肌检测中的应用价值。方法　对心肌梗死 2 0例于血管重建术前分别行静态及硝酸甘油介入显像 ,血管重建术后 1个月重复静息心肌显像并进行对比分析。结果　 2 0例共有 1 4 4个异常灌注的心肌节段 ,硝酸甘油介入后有 72个心肌节段灌注改善 ,血管重建术后有 77个心肌节段灌注改善。硝酸甘油介入改善的 72个节段术后有 62个节段改善 ;而术前无改善的 72个节段术后只有 1 5个节段改善 ,硝酸甘油介入99mTc MIBI心肌灌注显像对存活心肌预测的阳性预测值为 86 .1 % ,阴性预测值为 79.2 % ,预测准确率为 82 .6%。结论　硝酸甘油介入99mTc MIBI心肌灌注断层显像是可供临床检测心肌存活的安全、有价值的方法     

Dipyridamole stress echocardiography and ultrasonic myocardial tissue characterization in predicting myocardial ischemia, in comparison with dipyridamole stress Tc-99m MIBI SPECT myocardial imaging

The purpose of this study was to validate whether dipyridamole stress ultrasonic tissue characterization with cyclic variation of integrated backscatter (CVIBS) compared with dipyridamole stress echocardiography and dipyridamole stress Tc99m-MIBI SPECT myocardial perfusion scintigraphy could predict myocardial ischemia in patients with chronic coronary artery disease. Twenty patients (16 M, 4 F) who had coronary angiography for stable angina pectoris were included in the study. Mean age was 62 +/- 8 years. The left ventricle was divided into 16 segments. Regional wall motion analysis and CVIBS measurements were obtained from 16 myocardial segments at rest and after dipyridamole (0.84 mg/kg) infusion. After 10 minutes, Tc-99m MIBI (10 mCi) was injected and SPECT myocardial imaging was performed. After 3 hours, 25 mCi Tc-99m MIBI was reinjected and rest images were obtained. A total of 320 ventricular wall segments were evaluated. Two hundred and six ventricular wall segments were supplied by stenotic coronary arteries and 114 segments were supplied by normal coronary arteries. Dipyridamole stress Tc-99m MIBI SPECT studies showed abnormal myocardial perfusion in 176 segments and normal perfusion in 144 segments. Transient regional wall motion abnormality was detected in 116 segments. A significant decrease in CVIBS after dipyridamole stress was detected in 184 segments. The sensitivity and specificity of dipyridamole stress echocardiography, Tc-99m MIBI SPECT, and CVIBS were 56% and 100%, 85% and 92%, and 89% and 100%, respectively, compared with the results from coronary angiography. Dipyridamole stress ultrasonic tissue characterization with CVIBS may provide more sensitive detection of myocardial ischemia than dipyridamole stress echocardiography and may be as valuable as dipyridamole stress myocardial perfusion scintigraphy.     

Prediction of restenosis after percutaneous transluminal coronary angioplasty using coronary flow reserve. Kansai Doppler Guide Wire Study Group

This multi-center prospective study attempted to predict restenosis after percutaneous transluminal coronary angioplasty(PTCA) using coronary flow reserve. Intracoronary blood flow velocity was measured in 47 patients(37 males, 10 females, mean age 66 +/- 9 years) with a Doppler guide wire, following successful PTCA. Twenty-four patients had prior myocardial infarction. After successful PTCA, a Doppler guide wire was placed at the distal portion of the target lesion, and coronary blood flow velocity was measured before and during intravenous administration of adenosine triphosphate. Follow-up coronary angiography was performed 154 +/- 69 days after PTCA, and the diameter stenosis of the target lesion was measured using quantitative coronary angiography. Follow-up angiography showed restenosis in 13 patients(28%). Sensitivity and specificity for predicting restenosis were low(50%, 45%, respectively) with a post-PTCA% diameter stenosis cut-off point of 27%. Sensitivity and specificity were 67% and 61% with a minimal lumen diameter cut-off of 1.8 mm. The reference coronary artery diameter(cut-off point 2.5 mm) was better for predicting restenosis(sensitivity 78% and specificity 76%). Sensitivity and specificity were 62% and 67%, respectively, using coronary flow reserve(cut-off point 2.0). The restenosis rate of patients with a reference diameter of more than 2.5 mm was 10%, but 54% for those with less than 2.5 mm(p < 0.05). In patients with a reference diameter of less than 2.5 mm, coronary flow reserve was useful for predicting restenosis(cut-off point 1.9, sensitivity 71% and specificity 83%). Coronary flow reserve is useful for predicting restenosis after PTCA, when combined with reference coronary artery diameter.     

The value of stress single-photon emission computed tomography imaging performed routinely at 6 months in asymptomatic patients for predicting angiographic restenosis after successful direct percutaneous intervention for acute ST elevation myocardial infarction

AIMS: The authors tested the value of stress single-photon emission computed tomography (SPECT) imaging performed systematically for detecting angiographic restenosis in asymptomatic patients who underwent direct percutaneous coronary intervention (PCI) for acute ST segment elevation myocardial infarction (STEMI). Angiographic restenosis of the infarct-related artery after direct PCI for STEMI is often silent and the strategy for follow-up evaluation of asymptomatic patients remains debated. METHODS: A total of 149 patients successfully treated by direct PCI (96% stenting) for STEMI with no symptoms during the follow-up systematically underwent both rest thallium 201/stress Tc 99m setamibi myocardial perfusion imaging and coronary angiogram at 6 months. Patients were followed up for 2.5+/-0.5 years after 6 months control for cardiac events. RESULTS: In the 149 patients, the sensitivity, specificity, positive and negative predictive values and accuracy of SPECT imaging were 48, 61, 35, 72 and 57%, respectively, for detecting binary angiographic restenosis defined as > or =50% diameter stenosis. Whether stress testing was maximal or performed after withheld anti-ischemic drugs did not improve the results. Reversible ischemia at SPECT in the infarct territory did not predict long-term cardiac events. CONCLUSION: These data suggest a poor correlation between stress SPECT imaging and angiographic restenosis at 6 months in patients treated by direct PCI for STEMI who remain asymptomatic at follow-up. The long-term clinical prognostic value of SPECT reversible ischemia in the infarct territory appears also limited in this peculiar subset of patients. These findings should be taken into account in the strategy of the clinical follow-up of this population.     

The Value of Upsloping ST Depression in Diagnosing Myocardial Ischemia

We evaluated the value of upsloping ST‐segment depression in predicting the severity of myocardial ischemia. Comparison of the exercise electrocardiographic changes was made to myocardial perfusion images and coronary angiograms as the criteria for ischemia. We retrospectively reviewed 621 patients who underwent exercise technetium‐99m tetrofosmin single photon emission computed tomography (SPECT) for the assessment of suspected or known coronary artery disease followed by coronary angiography within a 3‐month period. The test sensitivity and specificity of 1 mm horizontal or downsloping ST depression in predicting reversible ischemia as assessed by gated SPECT imaging (GSI) were 65% and 87%, respectively. The corresponding values were 67% and 94% compared to coronary angiography. The sensitivity and specificity of gated SPECT imaging compared to coronary angiography were 78% and 89%. On the other hand when 1 mm upsloping ST depression at 70 ms past the J‐point was regarded as abnormal, along with horizontal and downsloping, the sensitivity and specificity were 82% and 90% compared to myocardial perfusion imaging, and 77% and 92% as assessed by coronary angiography. We conclude that upsloping ST‐segment depression is associated with an increased risk of coronary artery disease and is a valuable predictor of myocardial ischemia.     

Identification of hemodynamically significant restenosis after percutaneous transluminal coronary angioplasty in acute myocardial infarction by transesophageal dobutamine stress echocardiography and comparison with myocardial single photon emission computed tomography

BACKGROUND: Beside thrombolysis, percutaneous transluminal coronary angioplasty (PTCA) has become a well-established treatment for acute myocardial infarction. However, restenosis occurs in approximately 15%-40% of patients. Despite a frequently occurring infarct-related regional systolic dysfunction at rest, the identification of hemodynamically relevant restenosis seems important in terms of risk stratification, adequate treatment, and possible improvement of prognosis in these patients. This study was designed to assess the role of transesophageal dobutamine stress echocardiography and myocardial scintigraphy for identification of hemodynamically significant restenosis after PTCA for acute myocardial infarction. METHODS: Multiplane transesophageal stress echocardiography (dobutamine 5, 10, 20, 30, and 40 micrograms/kg per min) studies and myocardial single photon emission computed tomography (SPECT) studies were performed in 40 patients, all of whom underwent PTCA in the setting of acute myocardial infarction > or = 4 months prior to the test. Repeated coronary angiography was performed in all study patients who showed stress-induced perfusion defects or wall-motion abnormalities, or both. RESULTS: Significant restenosis (> or = 50%) was angiographically found in 15 (37.5%) of 40 patients. Of these 15 patients, transesophageal dobutamine stress echocardiography identified restenosis in 12 (80%) and myocardial SPECT in 14 (93%), yielding diagnostic agreement in 70% of patients. Echocardiographic detection of restenosis was based mainly on a biphasic response to increasing doses of dobutamine. Sensitivity and specificity for identification of hemodynamically relevant restenosis in individual patients was 80% and 92%, respectively for dobutamine stress echocardiography versus 93% and 68% for myocardial SPECT. CONCLUSIONS: Both transesophageal dobutamine stress echocardiography and myocardial SPECT were highly sensitive in identifying significant restenosis after PTCA for acute myocardial infarction. Therefore, either test, as a single diagnostic tool or especially if performed together, are clinically valuable alternatives to coronary angiography for the detection of restenosis after PTCA for acute myocardial infarction.     

Functional assessment of coronary artery stenosis by Doppler derived absolute and relative coronary blood flow velocity reserve in comparison with 99mTc MIBI SPECT

OBJECTIVE—To determine the relation between the relative and absolute coronary blood flow velocity reserve (CFVR) compared with the results of ^99mTc MIBI single photon emission computed tomography (SPECT).
METHODS—In 37 patients with one vessel disease, ^99mTc MIBI SPECT was performed before angioplasty, two to three weeks after angioplasty, and at six months' follow up. CFVR was measured distal to the stenosis (dCFVR) as well as in a reference coronary artery before angioplasty, immediately after angioplasty, and at late follow up. Relative CFVR (rCFVR) was calculated as the ratio between dCFVR and CFVR measured in the reference coronary artery. The optimal thresholds for reversible perfusion defects were calculated using receiver operating characteristic curves.
RESULTS—The agreement for the full range of coronary artery stenosis (n = 107, mean (SD) diameter stenosis 48 (28)%, range 0-98%) between dCFVR (cut off value 1.9) and rCFVR (cut off value 0.65) with ^99mTc MIBI SPECT was 81% and 85%, respectively. In intermediate lesions (n = 49, diameter stenosis range 30-75%) the agreement between dCFVR (cut off value 2.0) and ^99mTc MIBI SPECT was 72%, which increased to 78% using the rCFVR (cut off value 0.65).There was a strong linear relation between dCFVR and rCFVR (r = 0.93, p < 0.0001).
CONCLUSIONS—A best cut off value for dCFVR of 1.9 corresponds with a best cut off value of 0.65 for rCFVR, within the full range of coronary narrowings. Intracoronary blood flow velocity analysis could obviate the need for additional myocardial perfusion scintigraphy in the majority of patients.


Keywords: intracoronary Doppler; relative coronary blood flow velocity reserve; ^99mTc MIBI single photon emission computed tomography