单硝酸异山梨酯介入99mTc-MIBI再注射心肌断层显像评估心肌存活力

目的　评估静息 99m Tc- MIBI显像及单硝酸异山梨酯介入后 99m Tc- MIBI再注射显像在检测心肌梗死病人心肌存活力方面的差异。方法　对 46例心肌梗死患者进行 99m Tc- MIBI心肌断层显像以及单硝酸异山梨酯静脉介入后 99m Tc- MIBI再注射心肌断层显像。结果　静息 99m Tc- MIBI显像出现灌注异常节段为 30 4个 ,根据心肌放射性分布情况计分 ,平均得分为 1 5.1± 3.8。单硝酸异山梨酯介入 99m Tc- MIBI再注射显像灌注异常节段为 2 63个 ,平均得分为 1 0 .8± 1 .6,两者比较差异有显著性 (P<0 .0 1 )。结论　单硝酸异山梨酯介入 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。     

门控心肌灌注断层显像测得心功能参数对老年冠心病预后的评价

目的　评价 99m Tc- MIBI门控心肌灌注断层显像中测得的心功能参数对老年冠心病 (CHD)预后的评定。方法　对老年人冠心病非心肌梗死组 (CHD- NMI) 33例 ,陈旧心肌梗死组 1 3例 (CHD- OMI)及 1 2例正常对照组进行 99m Tc- MIBI门控心肌灌注断层显像 ,利用计数法测得左室舒张末期容积 (EDV)、左室收缩末期容积 (ESV)和左室射血分数 (LVEF)。测得心功能参数对照组与 CHD- NMI组比较有差异 (P<0 .0 5) ,CHD-NMI与 CHD- OMI组比较有显著差异 (P<0 .0 1 )。结论　 EDV、ESV、LVEF是评价左室功能的重要指标 ,对 CHD的功能评价 ,疗效观察及预后的判定均有重要意义。     

~(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     

门控心肌单光子计算机断层显像评价心肌缺血后心肌顿抑

目的:用门控心肌单光子计算机断层(SPECT)显像评价运动试验后缺血性心肌顿抑.方法:对108例临床疑诊冠心病的患者及30例冠心病低度可能的患者行运动试验后早期(5～15 min)、延迟(约1.5 h)及隔日静息门控99m锝－甲氧基异丁基异腈(MIBI)心肌SPECT显像,用QGS软件处理得到左心室EF、舒张末期容积、收缩末期容积,并对心肌灌注进行17节段5分法评分.根据心肌灌注显像将108例患者分为心肌缺血组(70例)和心肌显像正常组(38例),比较心肌缺血组、心肌显像正常组及冠心病低度可能组运动试验后早期、延迟及静息左心室EF、舒张末期容积、收缩末期容积的变化.结果:心肌缺血组患者运动试验后早期及延迟显像时左心室EF值低于静息EF值;心肌缺血组运动试验后收缩末期容积较静息时增加,运动试验后收缩末期容积与静息收缩末期容积的比值分别为1.28(早期)、1.25(延迟);三组患者舒张末期容积差别无统计意义.左心室EF值下降及收缩末期容积扩张有很好的相关性,多因素回归分析显示SDS是左心室EF值下降及收缩末期容积扩张的独立预测因子.心肌显像正常组及CAD低度可能组无此变化.结论:在运动试验门控心肌SPECT显像中,心肌缺血患者常会出现心肌顿抑,表现为左心室功能的延迟恢复,即运动试验后左心室EF降低、收缩末期容积扩张.并且,心肌顿抑的发生与心肌缺血的严重程度密切相关,心肌缺血的数量是运动试验后左心室功能改变的独立预测因子.     

99mTc-NOET心肌灌注显像的初步临床应用

目的 :观察 99m Tc- NOET心肌灌注显像剂在心肌组织中的再分布特性及其对心脏缺血性疾病的诊断价值。方法 :对 5 2例冠心病心绞痛患者进行了运动负荷试验 ,静脉注射 99m Tc- NOET后 30 m in行心肌断层显像 ,3～ 4h行再分布显像。常规心肌断层显像采集和图像重建后观察放射性分布现象并评价其诊断价值。结果 :5 2例中 40例运动心肌灌注断层显像 1个以上节段出现放射性稀疏 -缺损区 ,38例出现明显放射性再分布。其中 5例同期做冠状动脉造影对照 ,4例与 99m Tc- NOET结论吻合。结论 :99m Tc- NOET是一种良好的新型心肌灌注显像示踪剂 ,它具有明显心肌再分布特性 ,对心肌缺血性病变的临床评价有价值     

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     

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     

核素心肌灌注显像与门控心血池显像在儿童病毒性心肌炎的应用

目的 :探讨儿童病毒性心肌炎 ( VMC)患者心肌灌注显像与门控心血池显像的临床价值。方法 :应用99m锝 -甲氧基异丁基异腈 ( 99m Tc- MIBI)对 85例患儿进行心肌灌注显像 ,观察心肌的血流灌注情况 ,其中 59例同期进行了 99m Tc-红细胞多门电路心血池显像测定左、右心室收缩和舒张功能及其时相变化。结果 :85例 VMC心肌灌注显像显示前壁、下壁、后壁、前间壁血流受损 ,分别占 76.5% ,34.1 % ,2 0 .0 %和 1 7.6% ,总阳性率为 78.8%。59例门控心血池显像示左室射血分数<50 % ,右室射血分数 <40 % ,最大左室射血率 <2 .1 ,最大左室充盈率 <1 .7者 ,分别占 40 .7% ,1 0 .2 % ,40 .7% ,8.5% ,相角程 >60°占 55.9% ,总异常率为 74.6%。结论 :心肌灌注显像与门控心血池显像能反映心肌血流受损范围和心功能受损程度 ,尤其在了解 VMC心肌病变范围、程度等方法更为突出。     

心电图ST段改变与99mTC—MIBI心肌灌注显像对比分析

为分析心电图ST段改变与^99m“TC—MIBI心肌灌注显像诊断心肌缺血。对126例心电图ST段改变患者同时行^99mTC—MIBI静息心肌灌注显像。126例均为我院门诊及住院患者，临床诊断冠心病或可疑冠心病。其中男性94例,女性32例，年龄35～72岁，进行2次以上心电图检查．均有ST段改变。同时行^99mTC—MIBI静息心肌灌注显像，采用Elscint APEX—SPX 6HR SPECT静息状态下采集，断层处理。连续两层并在两个不同方向的相应节段上，出现放射性分布减低区,考虑为心肌缺血。     

高血压伴胸痛与心肌缺血的心肌核素显像分析

目的　探讨冠状动脉造影正常的高血压伴胸痛患者 SPECT心肌负荷显像特点及临床意义。方法　应用 99Tcm-甲氧基异丁基异腈 ( MIBI)门控心肌灌注断层显像定性与半定量记分法 ,比较了 2 0例冠状动脉造影 ( CAG)正常的高血压患者及正常对照组运动前后心肌显像特点。结果　 ( 1)心肌灌注断层分析 :高血压组心肌灌注显像阳性率为 65 % ,明显高于对照组 ( P<0 .0 5 ) ,其中 47( 75 .8% )个节段为可逆性缺损 ,8( 12 .9% )个节段为部分可逆性缺损 ,3 ( 4 .8% )个节段为固定性缺损 ,另有 4( 6.5 % )个节段存在反向分布 ;高血压组 7例心室壁肥厚患者 ,与 13例无心室壁肥厚患者心室壁节段灌注异常比较 ,两者之间差异显著 ( P<0 .0 5 )。 ( 2 )心功能参数分析 :高血压组运动负荷显像、静息显像左心室射血分数 ( L VEF )值测定未见明显差异。高血压组患者运动负荷显像左心室舒张末期心室容积 ( LVEDV)平均为 66.4± 12 .5 3 ,明显低于静息显像 L VEDV 73 .6± 14 .2 3 ( P<0 .0 0 1)。结论　 ( 1)心肌灌注显像异常可以发生在 CAG正常有 /或无心肌肥厚的高血压患者中 ,但随着心肌肥厚的加重 ,心肌缺血有加重趋势。 ( 2 ) CAG正常的高血压患者可能存在冠状动脉血流储备功能下降     

^99mTc—MIBI门控心肌舒张末期影像与非门控心肌影像检测老年冠心病人的比较

目的　评价     

Phase analysis of gated blood pool scintigraphic images to localize bypass tracts in Wolff-Parkinson-White syndrome

The ability of radionuclide techniques to localize bypass tracts in patients with Wolff-Parkinson-White syndrome to sites around the atrioventricular (AV) ring using a three view triangulation method was investigated. In 17 patients with Wolff-Parkinson-White syndrome, phase images were generated from gated blood pool scans using the first Fourier harmonic of the time-activity curve of each pixel. In addition, the difference between left and right ventricular mean phase angles was calculated for each patient and for 13 control subjects. Bypass tracts were localized to one or more sites on a 10 site grid schematically superimposed on the AV ring (Duke grid) by electrophysiologic study in all patients and by intraoperative mapping in 7 of the 17 patients. These same 10 anatomic sites were projected onto three scintigraphic views and the site of earliest ventricular phase angle was located in each view. The 10 sites around the AV ring were divided into two anatomic groups: free wall and septal/paraseptal. Phase image locations correlated with electrophysiologic locations within one grid site in 11 of 11 patients with free wall tracts and were confirmed at surgery in 5 of the 11. In five of six patients with septal/paraseptal tracts, electrophysiologic study could not localize the bypass tract to one site, whereas phase images localized two of the five as free wall adjacent to the septum, one as paraseptal and two as true posteroseptal. One posteroseptal site was confirmed at surgery. In one patient, in whom phase image analysis and electrophysiologic study showed different sites, existence of both tracts was confirmed at surgery.(ABSTRACT TRUNCATED AT 250 WORDS)     

Efficacy of the phase images in Fourier analysis using gated cardiac POOL-SPECT for determining the indication for cardiac resynchronization therapy.

BACKGROUND: Although cardiac resynchronization therapy (CRT) improves quality of life and survival for patients with heart failure, exact methods to estimate the effect of cardiac asynchrony have not yet been defined. METHODS AND RESULTS: Initially, to examine whether the phase analysis images in the Fourier analysis using gated cardiac pool single photon emission computed tomography (POOL-SPECT) could be used to evaluate cardiac asynchrony, 19 consecutive patients with dilated cardiomyopathy were studied. Interventricular asynchrony was defined by whether the peak of the picture elements of the right ventricle in the phase histogram fitted that of the left ventricle and intraventricular asynchrony by whether the phase image was described homogenously or not. The patients with both inter- and intraventricular asynchrony had significant deterioration in both left ventricular ejection fraction (p<0.01) and New York Heart Association functional class (p<0.01). To evaluate the efficacy of these phase images for CRT setting, 7 patients were tested before and after CRT. During a 3.9+/-3.6 month follow-up period, all patients had an improvement in their condition, and the inter- and intraventricular asynchrony significantly improved after CRT. The degrees of the inter- and intraventricular asynchrony were related to the degree of cardiac depression pre CRT. CONCLUSION: These results have shown that the phase images from POOL-SPECT are useful for assessing the effect of CRT in patients with heart failure, which suggests that it may provide information about the indication for CRT.     

Measurement of normal left atrial function with gated radionuclide angiography

A method is described for measuring relative left atrial volume changes with gated radionuclide angiography, using an approximate computer-generated functional image to locate the atrial region of interest. M mode echocardiographic measurements of left atrial and left ventricular distances from the chest wall allowed calculation of a correction factor for the differential attenuation of atrial and ventricular photons. Background-corrected left atrial time-activity curves obtained from normal subjects exhibited excellent temporal resolution and were used to identify and quantitate the reservoir and contractile phases of left atrial volume change. In 20 normal subjects, the mean (+/- standard deviation) value for left atrial fractional emptying was 0.39 +/- 0.07. Expressed as fractions of the left ventricular stroke volume, mean values of the specific phases of atrial volume change were (1) reservoir volume 0.25 +/- 0.09, (2) contractile volume 0.29 +/- 0.10, and (3) conduit volume 0.46 +/- 0.12.     

Analysis of left ventricular function from gated first-pass and multiple gated equilibrium acquisitions

^99mTechnetium-sestamibi is a new myocardial perfusion imaging agent that offers significant physical advantages over²⁰¹thallium for myocardial perfusion imaging. One of these advantages is that it can be used in the assessment of ventricular function by means of first-pass radionuclide angiography (FPRNA), acquired during the injection of the tracer. In this study we compared gated list mode first-pass acquisition with^99mTc-sestamibi (FP-MIBI) to multiple gated equilibrium radionuclide ventriculography (MUGA) with^99mTc-labelled red blood cells for the determination of global left ventricular ejection fraction (LVEF). The study population consisted of 20 patients (mean age 54 years) who were submitted to stress-rest perfusion imaging. Resting FPRNA was performed using^99mTc-sestamibi and the reference data were acquired within a week with the MUGA technique. A linear correlation between FP LVEF and MUG A LVEF gave an r=0.974 (p<0.01). Diastolic and systolic timing and velocity parameters had lower correlations between these two methods. We conclude thatglobal LVEF can be precisely measured with^99mTc-sestamibi when compared to usually employed MUGA technique with^99mTc-labelled red blood cells.