肥厚型心肌病患者核素心肌灌注/代谢显像的研究

目的:观察肥厚型心肌病(HCM)患者的核素心肌灌注/代谢显像的变化,以进一步揭示HCM的病理生理改变,为今后患者的预后分析提供基础.方法:采用单光子发射计算机断层成像双核素心肌灌注/代谢显像的方法对93例(男65例,女28例,年龄16~68岁)HCM患者行99mTc-甲氧基异丁基异腈(99mTc-MIBI)心肌灌注显像和18F-脱氧葡萄糖(18F-FDG)心肌代谢显像.患者均为空腹状态下,静脉注射99mTc-MIBI 20 mCi、18F-FDG 4 mCi,1小时后行双核素心肌显像.采用半定量评分法分析左心室室壁各节段的灌注及葡萄糖显像情况.结果:93例HCM患者99mTc-MIBI心肌灌注显像结果:左心室心肌放射性摄取增高患者90例(97%),其中间隔部82例,前壁20例,心尖部15例,外侧壁4例,下后壁3例.93例HCM患者18F-FDG心肌代谢显像结果:31例(33%)患者心肌未见明显显影;13例(14%)患者左心室显影清晰,左心室室壁各心肌节段均可见放射性摄取或明显摄取(得分为-1或-2);49例(53%)患者心肌部分节段有放射性分布,其中间隔36例,前壁35例,心尖部20例,外侧壁33例,下后壁32例.结论:肥厚型心肌病患者心肌灌注/代谢显像异常表现具有多样性,灌注显像的异常主要表现为心肌放射性摄取增高,最多累及部位为间隔部;而代谢显像表现不均一性较为明显,左心室室壁各心肌节段约可见放射性摄取的患者有14%,心肌部分节段可见放射性摄取的患者有53%,而左心室心肌各节段均未见放射性摄取的占33%.     

双核素心肌灌注显像对存活心肌判断

目的 :观察二硝酸异山梨醇酯 (isoket)介入后铊 2 0 1(2 0 1TI)和99mTc 甲氧基异丁基异腈 (MIBI)双核素心肌断层显像检测梗死后存活心肌的敏感性及两种核素间显像结果的一致性。方法 :将 4 0例陈旧性心肌梗死(OMI)患者 ,分为A(12例 )、B(16例 )及C(12例 )三组 ,A、B组分别进行isoket介入后2 0 1TI和99mTc MIBI单核素显像 ,C组进行isoket介入后2 0 1TI及99mTc MIBI双核素心肌显像。结果 :A组摄取2 0 1TI后出现不同程度的灌注异常节段共 6 5个 ,平均得分为 9.7± 1.2。B组摄取99mTc MIBI后出现不同程度的灌注异常节段共 87个 ,平均得分 10 .8± 1.6。C组以不同核素能窗双核素显像后结果2 0 1TI心肌显像检出灌注异常节段共 4 2个 ,平均得分 5 .8± 0 .6 ;99mTc MIBI心肌显像检出灌注异常节段共 4 8个 ,平均得分 6 .1± 0 .8。A组与B及C组两种结果比较 ,均P >0 .0 5。结论 :两种核素对梗死后心肌存活力的评估一致性良好 ;双核素心肌断层显像对梗死后心肌存活力的评估与单核素心肌断层显像是一致的 ,两种显像的结合可提高诊断的准确性     

犬心肌梗死再灌注前后血清CPK变化及~(99m)Tc-MIBISPECT改变

目的　探讨评估心肌梗死 (MI)范围及再灌注效果的方法。方法　制成 1 8只犬冠状动脉左前降支人工狭窄模型 ,随机分为3组 ,每组 6只 ,Ⅰ组犬为冠状动脉结扎 1 5h再灌注组 ,Ⅱ、Ⅲ组分别为犬冠状动脉结扎 3 0h、6 0h再灌注组。在冠状动脉结扎前 ,结扎90min及再灌注 2 4 0min测定 1 8只犬血清CPK并进行犬I再灌注前后99mTc MIBISPECT显像。结果　犬冠状动脉结扎后血清CPK升高 ,再灌注后Ⅰ、Ⅱ组CPK升高明显 ,Ⅲ组犬CPK升高不明显。犬梗死心肌99mTc MIBISPECT显像的放射性缺损节段分别有 33 3 %、30 0 %、1 1 1 %的节段在再灌注99mTc MIBISPECT显像中出现放射性填充 ,MI再灌注后 ,Ⅰ、Ⅱ、Ⅲ组犬的心肌放射性分布得分亦降低。结论　MI灌注后CPK反映心肌损伤程度的准确性较差 ,99mTc MIBISPECT显像是了解MI范围及再灌注效果的较好手段     

长期体育锻炼增加心肌葡萄糖代谢利用率

目的 研究长期进行大运动量体育锻炼的飞行员18F-脱氧葡萄糖(18F-FDG)心肌灌注显像的特点.方法 27 例无心血管病、糖尿病病史的长期进行大运动量锻炼的男性飞行员作为受枪者,分为受检当日早餐禁食(17例)和早餐予以谷物餐(10例)两组.每名受检者都在静息和蹬车运动达到次极最心率要求下进行2次99Tcm-甲氧基已乙腈(99Tcm-MIBI)和18F-FDG双核素心肌显像(共54例次),2次检查分别安排在相邻的2 d.然后对每名受检者进行运动与静息状态下心肌灌注显像进行视觉对比,判断是否存在心肌缺血.再采用17节段模型视觉半定量法对其心肌代谢显像结果 进行分析.结果 全部受检者蹬车运动都达到次极量心率(195-年龄),全部受检者的运动与静息99Tcm-MIBI心肌灌注显像对比后皆未发现心肌缺血.视觉定性分析,早餐禁食组共有4例次18F-FDGPET显像失败,不禁食组有1例次18F-FDG PET显像失败,差异无统计学意义.经17节段视觉半定量分析,在所有节段早餐禁食与否对运动和静息状态18F-FDG心肌代谢显像评分的影响差异均无统计学意义;在早餐禁食组,运动与静态的18F-FDG心肌代谢显像评分在6个节段差异有统计学意义;在不禁食组,3个节段的18F-FDG心肌代谢显像运动高于静息状态,差异具有统计学意义,其他节段无统计学差异.结论 长期大运动最锻炼的受检者即使不接受保证心肌代谢处于糖负荷的措施也能获得完整清晰的18F-FDG心肌代谢显像.长期锻炼可能提高心肌对于葡萄糖代谢的利用率,并进而提高心肌代谢的氧利用率.长期锻炼可直接提高心肌对于缺血缺氧的耐受能力.     

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。     

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。     

冠状动脉腔内心电图与核素心肌显像识别存活心肌的对照研究

目的 　 对照研究冠状动脉腔内心电图 (intracoronaryelectrocardiogram ,IC ECG)与核素心肌显像在识别存活心肌中的准确性及实用性 ,观察IC ECG是否较核素心肌显像具有准确率高、简便易行等优点 ,并从心电学角度为临床判断存活心肌提供一个新的指标。　方法　 4 2例心肌梗死患者 (梗死后 2周～ 3个月 ) ,采用经皮冠状动脉腔内成形术 (PTCA)支架术前静脉滴注小剂量多巴酚丁胺 (3μg·kg- 1 ·min- 1 )时合用舌下含服硝酸甘油 (0 5mg) 99mTc MIBI心肌显像 ,与术后 3周静息99mTc MIBI心肌显像的对照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。所有患者于PTCA支架术中同步记录IC -ECG及体表心电图 ,观察、测算J点后 4 0ms处ST段改变。根据IC ECG的ST段改变将患者分为 2组 ,A组 :IC ECG在术中ST段抬高 >0 2mV ;B组 :IC ECG在术中ST段抬高 <0 2mV。以术后 3周时静息99mTc MIBI心肌显像识别存活心肌者为阳性对照 ,观察IC ECG的ST段改变是否能够预测存活心肌。　结果　PTCA支架术前静息99mTc MIBI心肌灌注显像共有 16 4个节段心肌摄取异常。药物介入99mTc MIBI心肌灌注显像及PTCA支架术后 3周静息99mTc MIBI心肌灌注显像放射性分布异常节段心肌血流灌注改善。以PTCA支架术后 3周为标准 ,药物     

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。     

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。     

13N-NH3、18F-FDG PET显像在对心肌存活状况评估中的临床应用

目的探讨^13N-氨水(^13N-NH3)、^18F-脱氧葡萄糖(^18F-FDG)正电子断层显像(PET)心肌血流／代谢显像在陈旧性心肌梗死患者心肌存活状况评估中的临床应用价值。方法陈旧性心肌梗死患者20例，均采用^13N-NH3、^18F-FDG PET心肌灌注／代谢显像预测存活心肌。灌注缺损、代谢填充(血流-代谢不匹配)为心肌存活；灌注、代谢均缺损(血流-代谢匹配)为心肌无存活；同时进行超声心动图检查评价左室壁运动。PTCA 支架术后3—6个月，进行超声心动图检查随访评价左室壁运动的改善情况，其中12例患者在术后进行了^13N-NH3、^18F-FDG PET显像随访。结果PET显像判定为存活的心肌，介入治疗后87．5％的心肌节段运动功能得到改善；而判定为无存活的心肌节段介入治疗后，仅有2．4％的心肌节段运动功能得到改善。12例中，术后^13N-NH3、^18F-FDG PET、结果证实，存活心肌介入治疗后85．7％的心肌节段血流灌注及代谢恢复正常，而治疗前判定为无存活的心肌节段仅有3．3％的心肌节段血流灌注及代谢恢复正常。结论^13N-NH3、^18F-FDG PET显像对于心肌存活的估价及预测和(或)评价冠状动脉血管重建的疗效具有重要的临床应用价值。     

Left ventricular function assessed by multigated blood pool single photon emission computed tomography with 99mTc]

To evaluate the usefulness of gated blood pool single photon emission computed tomography with 99mTc (gated SPECT) for assessing left ventricular function, we performed gated SPECT in 2 normal subjects and 18 patients including 13 with ischemic heart disease, 3 with hypertrophic cardiomyopathy and 2 with dilated cardiomyopathy. Left ventricular end-diastolic volume (LVEDV), left ventricular ejection fraction (LVEF) and regional wall motion obtained by gated SPECT were compared with the results of contrast left ventriculography (contrast LVG), echocardiography and planar multigated blood pool imaging (planar blood pool). After the patients' red blood cells were labelled with 30 mCi (1,110 MBq) 99mTc in vivo, gated SPECT was performed in each of 32 projections through a 360 degree arc for each of the cardiac cycle divided into 16. From these images, the left ventricular vertical long-axis image, the horizontal long-axis and short-axis images were reconstructed. To calculate LVEDV, we used serial short-axis images which were composed of the left ventricle. To define left ventricular and left atrial borders, we used amplitude images and cinematic displays of the vertical long-axis image. The level of the optimal cut for delineating the left ventricular border was determined from the volume-cut-level-graph at each background activity, which was constructed by a phantom study. Left ventricular wall motion by gated SPECT was compared with the results of contrast LVG according to segmental analysis. LVEDV obtained by gated SPECT showed an excellent linear correlation with LVEDV calculated by echocardiography (r = 0.98, p < 0.01) and by contrast LVG (r = 0.89, p < 0.01).(ABSTRACT TRUNCATED AT 250 WORDS)     

A pathophysiologic study of tako-tsubo cardiomyopathy with F-18 fluorodeoxyglucose positron emission tomography.

AIMS; Our study aims to investigate the pathophysiologic mechanism underlying tako-tsubo cardiomyopathy using F-18 fluorodeoxyglucose (FDG) positron emission tomography (PET). METHODS AND RESULTS: Fifteen patients with tako-tsubo cardiomyopathy were enrolled in this study. Plasma catecholamines, cardiac troponin T (cTnT), and D-dimer were serially evaluated in all patients. Thallium-201 ((201)Tl) single-photon emission computed tomography (SPECT) and F-18 FDG PET were performed in 10 and eight patients, respectively. Emotional or physical stress occurred in 12 (80.0%) patients. ST-T segment abnormalities existed in all patients. Thirteen patients exhibited mildly elevated cTnT, although coronary angiography did not reveal significant stenosis in any patient. Endomyocardial biopsy specimens (n = 9) demonstrated contraction-band necrosis (n = 4) and mononuclear cell infiltration (n = 3). The levels of norepinephrine and epinephrine peaked on admission (744 +/- 452 and 140 +/- 166 pg/mL, respectively). There was severely reduced uptake at the apex on F-18 FDG PET image, despite slightly reduced uptake of (201)Tl. Elevation of D-dimer was observed in nine patients. CONCLUSION: The extent of metabolic defect involving apical akinetic area was more severe than perfusion abnormality. Our data suggest that sudden emotional or physical stress may cause a catecholamine-induced metabolic disorder in the myocardium, which is probably central to this syndrome.     

急性心肌梗死急诊介入治疗后心肌灌注评价方法的研究

目的　应用TMP ,CTFC ,maxSTE及sumSTR方法评价急性心肌梗死急诊介入治疗后心肌组织灌注并探讨其与临床预后的关系。方法　6 5例AMI急诊介入治疗后即刻采用TMP、CTFC及心电图(maxSTE ,sumSTR)方法评价心肌组织灌注,记录6个月心脏事件。结果　与双核素心肌灌注显像对比,检验每种评价方法的敏感性、特异性、准确性;maxSTE敏感性80 % ,特异性85. 7% ,准确性83 .1 % ;TMP敏感性73 3% ,特异性80 % ,准确性76 . 9% ;而CTFC( 4 0 ) ,CTFC( 30 ) ,sumSTR30 %和sum STR( 50 )预测价值较低。多变量回归分析显示TMP 0. 1级、maxSTE高危为6个月心脏事件的独立危险因子。结论　TMP ,maxSTE方法可以较好地评价心肌灌注程度,并对6个月临床预后有较好的预测价值。     

药物负荷超声心动图与双核素心肌显像对比检测存活心肌

目的　比较99mTc 甲氧基异丁腈(MIBI) /18F 脱氧葡萄糖(FDG)双核素同时采集法(DISA)单光子发射型断层显像(SPECT)和药物负荷二维超声心动图(2DE)试验,识别冠心病左心室收缩功能严重减低患者[左室射血分数(LVEF)≤45% ]存活心肌的准确性。方法　陈旧性心肌梗死患者26例,平均LVEF(38. 6±4 .9 )%,在一周内分别进行小剂量多巴酚丁胺10μg·kg-1·min-1(Dob10μg)、亚硝酸异山梨酯合用Dob5μg·kg-1·min-1 (ISDN Dob5μg)的2DE试验,以及DISASPECT心肌显像。所有患者在冠状动脉血管重建(CRV)术后(6 .8±2 .9)个月完成了2DE复查。采用16节段半定量法分别分析图像,以CRV术后收缩功能改善节段为存活标准,比较两种方法检测存活心肌的敏感性、特异性和准确性。结果　26例患者272个运动异常节段中,术后156个( 57. 4% )有收缩运动改善。DISASPECT检测出72 .4% (134 /254)存活心肌节段,显著高于术后实际改善率(P<0 .001)。Dob10μg2DE的存活心肌检出率为65 5% (163 /249 ),ISDN Dob5μg2DE的为65 .7%(176 /268),均与术后实际改善率一致(P均>0 .05)。DISASPECT检测存活心肌的敏感性、特异性和准确性分别为93%, 55%和76. 8%;Dob10μg2DE的分别为88 .6%, 64 .2%和77. 9%,两种方法检测效果相当(P均>0 .05)。ISDN Dob5μg     

急性心肌梗死经皮冠状动脉介入治疗后心肌灌注的方法评价

目的　联合应用TIMI心肌灌注分级 (TMP)、校正的TIMI画面记帧 (CTFC)、心电图ST段变化 (sumSTR)方法评价急性心肌梗死 (AMI)急诊经皮冠状动脉介入治疗 (PCI)后心肌灌注程度 ,探讨心肌灌注程度对临床预后的影响。方法　 77例AMI患者PCI后即刻采用TMP CTFC、TMP sumSTR、CTFC sumSTR三种联合方法评价心肌灌注程度 ,PCI术后 1个月检查双核素心肌灌注显像 ,记录 6个月心脏事件。结果　评价心肌灌注程度 ,与双核素心肌灌注显像对比 ,TMP sumSTR敏感性 86 7%、特异性 85 7%、准确性 86 2 % ;TMP CTFC敏感性 80 %、特异性 77 1%、准确性 78 5 % ;多变量回归分析TMP 0 / 1级 sumSTR <30 %为 6个月心脏事件的独立危险因子 (OR=2 1 5 ,95 %可信区间 2 7～ 6 5 7,P =0 0 0 3) ;Kaplan Meier分析曲线显示TMP sumSTR方法评价的心肌灌注不良组 6个月心脏事件高于心肌灌注良好组 (P <0 0 5 )。结论　TMP sumSTR、TMP CTFC能更好的评价心肌灌注程度 ;TMP sumSTR可预测 6个月心脏事件。     

Viable myocardium identified by reinjection thallium-201 imaging: comparison with regional wall motion and metabolic activity on FDG-PET.

Reinjection thallium-201 scans were performed in 68 patients with coronary artery disease after the routine stress-delayed scans for more accurate identification of new fill-in. Following the stress and 3 hour delayed thallium-201 SPECT scans, 40 MBq (1.1 mCi) was injected at rest, and 10 min later, the reinjection SPECT scan was obtained. To determine whether the reinjection method can aid in identifying ischemic but viable myocardium, the thallium-201 findings were compared with regional wall motion on radionuclide ventriculography in 61 patients and with metabolic activity on positron emission tomography (PET) using F-18 fluorodeoxyglucose (FDG) in 18 patients. The reinjection scan identified new fill-in which had not been shown on the stress-delayed scans in 6 of the 22 patients (27%) or in 29 of the 105 segments (28%). Regional wall motion was preserved more in the segments that exhibited new fill-in after reinjection (wall motion score = 1.64 +/- 1.29) than in those without new fill-in (score = 2.72 +/- 1.04) (p < 0.01). In the comparative study with FDG-PET, persistent FDG uptake was observed in all segments with new fill-in (20/20 segments: 100%); whereas, it was seen in only 7 of the 28 segments (25%) without new fill-in after reinjection (p < 0.05). We concluded that the segments having new fill-in after reinjection may represent ischemic but viable myocardium. Thus, the reinjection thallium-201 scan should be performed to identify ischemic myocardium which occasionally cannot be detected by the routine stress-delayed thallium-201 scans.     

Positron emission tomography detects evidence of viability in rest technetium-99m sestamibi defects

Objectives. The purpose of this study was to determine the relative value of single-photon emission computed tomographic (SPECT) imaging at rest using technetium-99m methoxyisobutyl isonitrile (technetium-99m sestamibi) with positron emission tomography for detection of viable myocardium.Background. Recent studies comparing positron emission tomography and thallium-201 reinjection with rest technetium-99m sestamibi imaging have suggested that the latter technique underestimates myocardial viability.Methods. Twenty patients with a previous myocardial infarction underwent rest technetium-99m sestamibi imaging and positron emission tomography using fluorine (F)-18 deoxyglucose and nitrogen (N)-13 ammonia. In each patient, circumferential profile analysis was used to determine technetium-99m sestamibi, F-18 deoxyglucose and N-13 ammonia activity (expressed as percent of peak activity) in nine cardiac segments and in the perfusion defect defined by the area having technetium-99m sestamibi activity <60%. Technetium-99m sestamibi defects were graded as moderate (50% to 59% of peak activity) and severe (<50% of peak activity). Estimates of perfusion defect size were compared between technetium-99m sestamibi and N-13 ammonia.Results. Sixteen (53%) of 30 segments with moderate defects and 16 (47%) of 34 segments with severe defects had ≥60% F-18 deoxyglocose activity considered indicative of viability. Fluorine-18 deoxyglucose evidence of viability was still present in 50% of segments with technetium-99m sestamibi activity <40%. There was no significant difference in the mean (± SD) technetium-99m sestamibi activity in segments with viable (40 ± 7%) and nonviable segments (49 ± 7%, p = 0.84). Of the 18 patients who had adequate F-18 deoxyglucose studies, the area of the technetium-99m sestamibi defect was viable in 5 (28%). In 16 patients (80%), perfusion defect size determined by technetium-99m sestamibi exceeded that measured by N-13 ammonia. The difference in defect size between technetium-99m sestamibi and N-13 ammonia was significantly greater in patients with viable (21 ± 9%) versus nonviable segments (7 ± 9%, p = 0.007).Conclusions. Moderate and severe rest technetium-99m sestamibi defects frequently have metabolic evidence of viability. Technetium-99m sestamibi SPECT yields larger perfusion defects than does N-13 ammonia positron emission tomography when the same threshold values are used.     

Added Value of Using a Cocktail of F-18 Sodium Fluoride and F-18 Fluorodeoxyglucose in Positron Emission Tomography/Computed Tomography for Detecting Bony Metastasis: A Case Report

Current nuclear imaging of the skeletal system is achieved using technetium-99m (Tc-99m) methylene diphosphonate (MDP), F-18 sodium fluoride (NaF), or F-18 fluorodeoxyglucose (FDG). However, comparisons of these are rare in the literature.We present a case of a 51-year-old female with suspicious lung cancer due to main symptoms of dyspnea, nonproductive cough, and pleural pain. Tc-99m MDP whole-body bone scan (WBBS) showed multiple bony metastases. Five days later, positron emission tomography/computed tomography (PET/CT) images using both F-18 NaF and a cocktail of F-18 NaF and F-18 FDG were obtained on the same day 2 hours apart. The former showed more foci and precisely showed bony lesions compared to those obtained using Tc-99m MDP WBBS. However, the latter demonstrated more extensive radiotracer uptake, especially in osteolytic lesions, and additional soft tissue lesions in the left axillary and surpraclavicular nodes as well as the left pleura. Surgical biopsy was performed in left axillary nodes, and the metastatic carcinoma was found to be of breast origin.This case demonstrated that a cocktail of F-18 NaF and F-18 FDG could be useful in PET/CT for not only detecting more skeletal lesions but also guiding biopsies accurately to the affected tissue.     

No difference in cardiac event-free survival between positron emission tomography-guided and single-photon emission computed tomography-guided patient management: a prospective, randomized comparison of patients with suspicion of jeopardized myocardium

OBJECTIVES: We sought to prospectively compare nitrogen-13 (13N)-ammonia/18fluorodeoxyglucose (18FDG) positron emission tomography (PET)-guided management with stress/rest technetium-99m (99mTc)-sestamibi single-photon emission computed tomography (SPECT)-guided management. BACKGROUND: Patients with evidence of jeopardized (i.e., ischemic or viable) myocardium may benefit from revascularization, whereas patients without it should be treated with drugs. Both PET and SPECT imaging have been proven to delineate jeopardized myocardium. When patient management is based on identification of jeopardized myocardium, it is unknown which technique is most accurate for long-term prognosis. METHODS: In a clinical setting, 103 patients considered for revascularization with left ventricular wall motion abnormalities and suspicion of jeopardized myocardium underwent both PET and SPECT imaging. The imaging results were used in a randomized fashion to determine management (percutaneous transluminal coronary angioplasty [PTCA], coronary artery bypass graft surgery [CABG] or drug treatment). Follow-up for cardiac events (cardiac death, myocardial infarction and revascularization) was recorded for 28 +/- 1 months. The study was designed to have a power of 80% to detect a 20% difference in the event rate between PET- and SPECT-based management. RESULTS: Management decisions in 49 patients randomized to PET (12 who had PTCA, 14 CABG and 23 drug therapy) were comparable with 54 patients randomized to SPECT (15 who had PTCA, 13 CABG and 26 drug therapy). In terms of cardiac event-free survival, no differences between PET and SPECT were observed (11 vs. 13 cardiac events for PET and SPECT, respectively; p = NS by the Kaplan-Meier statistic). CONCLUSIONS : No difference in patient management or cardiac event-free survival was demonstrated between management based on 13N-ammonia/18FDG PET and that based on stress/rest 99mTc-sestamibi SPECT imaging. Both techniques may be used for management of patients considered for revascularization with suspicion of jeopardized myocardium.     

静态心肌灌注-代谢显像评价心肌梗死后经冠状动脉介入骨髓干细胞移植治疗的价值

目的:应用心肌灌注-代谢显像评价心肌梗死(AMI)后经冠状动脉介入移植治疗的疗效。方法:应用单光子发射型断层扫描(SPECT)静态心肌灌注代谢显像对比观察经冠状动脉成形术(PCI)+支架(stent)+心肌骨髓干细胞移植(MBMC)前后的心肌梗死区心肌血流灌注和代谢变化。结果:介入移植治疗前灌注缺损106节段,代谢缺损80节段;介入治疗后灌注缺损84节段,代谢缺损66节段,治疗前后灌注代谢差异无统计学意义(χ2=0.033,P>0.05);介入移植治疗前后人均灌注缺损分别是(3.13±1.14)节段和(2.54±1.30)节段,2组差异有统计学意义(P=0.0005);介入移植治疗前后人均代谢缺损分别是(2.42±1.28)节段和(2±1.28)节段,2组差异有统计学意义(P=0.004)。介入移植治疗后定量分析靶心图灌注显像的总记分(SPS)、代谢显像的总记分(SMS)以及严重度记分(SSS)较治疗前均有下降,但无统计学意义(P=0.184,P=0.608,P=0.166)。结论:静态心肌灌注-代谢显像是观察经冠状动脉介入移植治疗AMI疗效的一种方法。