超声斑点追踪应变率成像技术结合多巴酚丁胺负荷试验评价冠状动脉粥样硬化性心脏病患者存活心肌的价值

目的探讨超声斑点追踪应变率成像技术(SRI)结合多巴酚丁胺负荷试验(DSE)评价冠状动脉粥样硬化性心脏病患者存活心肌的临床价值。方法 27例经超声心动图检查存在左心室室壁节段性运动异常和左心室收缩功能障碍(左心室射血分数<50%)的冠状动脉粥样硬化性心脏病患者,经皮冠状动脉介入治疗(PCI)之前进行联合DSE的斑点追踪SRI成像及双核素单光子发射型断层显像(DISA-SPECT)检查。PhilipsiE33彩色超声诊断仪分别录入静息及DSE状态下斑点追踪SRI图像并存储,Qlab7.0定量分析软件计算各节段的纵向收缩期峰值应变率(LSR)。所有患者在完成联合DSE的SRI及DISA-SPECT检查后1周内进行PCI术。术后1、3、6个月时分别复查超声心动图,PCI术后室壁运动改善作为判定存活心肌的金标准。绘制受试者操作特性曲线(ROC)评价LSR检测存活心肌的敏感度及特异度。结果超声心动图检出165个室壁运动异常节段(RWMA),PCI术后超声心动图(金标准)检出存活心肌106(64.2%,106/165)个节段,非存活心肌59(35.8%,59/165)个节段。DISA-SPECT检测出存活心肌104个节段,非存活心肌61个节段,与PCI术后超声心动图比较,其敏感度、特异度和准确性分别为87.7%(93/106)、81.4%(48/59)和85.5%(141/165)。静息状态下SRI参数LSR预测存活心肌ROC下面积为0.694(P<0.001),截断点为-1.08,敏感度为66.7%,特异度为62.7%;联合DSE后ROC下面积为0.859(P<0.001),截断点为-1.30,敏感度和特异度分别为84.4%和85.3%,较静息时均有显著提高(χ2=9.082、7.394,P<0.05)。静息状态下存活心肌和非存活心肌LSR分别为(-1.12±0.17)s-1、(-1.05±0.14)s-1,差异有统计学意义(t=16.84,P<0.01);DSE后存活心肌和非存活心肌LSR分别为(-1.64±0.31)s-1、(-1.09±0.42)s-1,差异亦有统计学意义(t=11.87,P<0.01)。SRI联合DSE检测冠状动脉粥样硬化性心脏病患者存活心肌与DISA-SPECT相比,敏感度略低(84.4%vs87.7%)、特异度略高(85.3%vs81.4%),但差异无统计学意义(χ2=0.621、0.241,P>0.05)。联合DSE的SRI检测存活心肌与DISA-SPECT有良好的相关性(rn=0.819,P<0.001)。结论联合DSE的SRI参数LSR检测存活心肌的敏感度及特异度较静息时均有显著提高,联合DSE的SRI检测冠状动脉粥样硬化性心脏病患者存活心肌的敏感度和特异度与DISA-SPECT基本相同,并具有良好的相关性。     

多巴酚丁胺负荷超声下斑点追踪与组织多普勒技术检测存活心肌的临床价值

目的 探讨超声斑点追踪技术(STE)与组织多普勒技术(TDI)分别联合多巴酚丁胺负荷试验检测存活心肌的临床价值.方法 左心室收缩功能下降(左心室射血分数＜50％)冠心病患者37例,在血运重建之前进行联合多巴酚丁胺负荷超声心动图(DSE)的STE与TDI检查,分析计算室壁运动异常节段(RWMA)的静息及DSE后纵向应变率(LSR)和收缩期峰值速度(PSV).血运重建后1、3、6个月分别复查超声心动图,室壁运动改善为判定存活心肌的金标准,分析STE与TDI检测存活心肌的价值.结果 检查RWMA214个,金标准检测119个节段为存活心肌,95个节段为非存活心肌.存活心肌与非存活心肌的LSR和PSV在静息状态下比较差异有统计学意义(P＜0.01),存活心肌组的LSR和PSV在DSE前后比较差异有统计学意义(P＜0.01),而非存活心肌组的LSR和PSV在DSE前后差异无统计学意义(P＞0.05).受试者工作特征(ROC)曲线判定以△LSR(％)≥7.14％为截断点,检测存活心肌的敏感度88.2％,特异度80.0％;以△PSV(％)≥8.04％为截断点,检测存活心肌的敏感度74.8％,特异度83.2％.联合运用LSR和PSV两项指标,检测存活心肌的敏感度和特异度分别提高至89.8％、88.7％.结论 STE与TDI联合DSE检测存活心肌的敏感度和特异度有明显提高,适宜在临床推广使用.     

冠状动脉内支架植入术前后左心室长轴应变率的定量观察

目的 探讨长轴应变率成像(SRI)评价冠状动脉性心脏病(CAD)患者冠状动脉支架植入术前后左心室局部功能变化的临床价值.方法 CAD患者32例,均经冠状动脉造影证实至少有1支冠状动脉主支狭窄≥75%,分别于PTCA支架植入术前1～3天(术前组)、术后(3.0±0.2)个月(术后组)接受超声心动图检查.正常对照组40名.分别测量术前组、术后组、正常对照组左心室基底段和中段的收缩期应变率(SRs)、舒张早期应变率(SRe)、舒张晚期应变率(SRa),并计算平均应变率(mSRs、mSRe、mSRa).对CAD组与正常对照组,术前组与术后组各参数进行比较.结果 术前组左心室心肌12个节段中有10个节段SRe、7个节段SRs及6个节段SRa值较正常对照组明显降低.术后组有8个节段SRs、3个节段SRe较术前组明显增加.以SRs的绝对值0.78 s-1为截断值判断左心室节段收缩功能恢复的准确率、敏感度、特异度分别为65.66%、63.57%、67.25%;以SRe 0.90 s-1为截断值判断左心室局部心肌松弛性恢复的准确率、敏感度、特异度分别为65.68%、65.63%、65.44%.结论 SRs与SRe可用于评价PTCA支架植入术后左心室心肌局部功能恢复.     

超声二维应变成像技术在陈旧心肌梗死患者心肌存活评价中的应用

目的探讨超声二维应变成像技术在陈旧心肌梗死患者心肌存活评价中的应用价值。方法 20例即将接受血运重建术的陈旧心肌梗死患者(共计95节段),于术前1周行双核素心肌灌注与代谢扫描,以核素心肌灌注/代谢显像结果作为金标准将各节段患者分为心肌存活组(73节段)与心肌非存活组(22节段)。另外选择同期于本院进行体检的健康者20名作为对照组,比较患者组与健康对照组相关指标水平,比较心肌存活组与非存活组心肌应变参数(RS_(peak-sys)、LS_(peak-sys)及CS_(peak-sys))及2DSE检测心肌存活性的敏感度与特异度。结果 (1)健康对照组与患者组在LVEF、LVFS、LVEDd及SV方面的差异均有统计学意义(P0.05);(2)经超声二维应变成像技术检测,心肌存活组RS_(peak-sys)与LS_(peak-sys)均显著大于心肌非存活组,而2组CS_(peak-sys)差异无统计学意义(P0.05);(3)以RS_(peak-sys)与LS_(peak-sys)作为观察对象做ROC曲线,RS增加9.8%检测存活心肌的敏感度与特异度分别为81.98%与81.13%,以LS增加16.5%检测心肌的敏感度及特异度分别为83.59%与92.28%。结论超声二维应变成像技术可作为陈旧心肌梗死患者心肌存活与否评价的新方法。     

多巴酚丁胺负荷磁共振成像检测存活心肌的临床研究

目的 评价小剂量多巴酚丁胺(10μg·kg-1·min-1)负荷磁共振成像(MRI)检测存活心肌的临床价值.方法 经彩色多普勒超声检查存在左心室壁节段运动障碍冠心病患者24例,进行MRI、小剂量多巴酚丁胺负荷MRI、冠状动脉造影(CAG)及经皮冠状动脉介入治疗(PCI),所有狭窄病变行完全血运重建.参照美国超声心动图学会16节段划分法,经MRI测得各运动异常节段小剂量多巴酚丁胺负荷前后舒张末期室壁厚度(EDWT),以应用小剂量多巴酚丁胺后室壁增厚为存活心肌标准;术后1、3、6个月时复查心脏超声,以冠状动脉血运重建后室壁节段收缩功能改善为判断存活心肌的金标准.结果 24例冠心病患者共获得符合条件的室壁运动异常节段170个,根据金标准判断其中115个为存活心肌,55个为非存活心肌;MRI检测存活心肌的敏感度、特异度、准确度分别是76.5%、90.9%、81.2%.结论 小剂量多巴酚丁胺负荷MRI检测存活心肌有较高的临床价值.     

应变率成像结合多巴酚丁胺负荷试验检测早期心肌缺血的临床研究

目的探讨应变率成像(SRI)技术结合多巴酚丁胺负荷试验(DSE)检测早期心肌缺血的临床应用价值。方法选择经冠状动脉造影证实为左前降支单支病变的冠心病患者15例,行DSE检查,于心尖四腔、两腔及三腔观测量静息状态及不同负荷剂量下左室壁的收缩期峰值应变率(SRs)、舒张早期峰值应变率(SRe)、峰值应变(S)及校正心肌舒张起始时间(TR-correct),与健康对照组比较,并应用ROC曲线下面积评价上述参数检测早期心肌缺血的价值。结果病例组随负荷剂量增加各节段的SRs、SRe、S升高,TR-correct值缩短,但缺血危险节段的升高及缩短幅度明显低于非缺血节段,20μg.kg-1.min-1负荷时,若分别以SRs、SRe、S升高幅度<20%为截断值,预测缺血危险节段的敏感性分别为0.713、0.825和0.865,特异性分别为0.768、0.764和0.839;以TR-correct值缩短幅度<10%为截断值,预测缺血危险节段的敏感性和特异性分别为0.907和0.809。结论SRI结合DSE是检测心肌缺血敏感而可靠的手段,其中S和TR-correct是相对较好的指标。     

不同多巴酚丁胺超声负荷方法对存活心肌的检出价值

目的:探讨小剂量多巴酚丁胺负荷超声心动图(LDDSE)与标准剂量多巴酚丁胺负荷超声心动图(DSE)对存活心肌的检出价值。方法:对14例正常人(CON)和20例冠心病(CAD)患者采用标准的DSE方案(0～40μg?kg·min),分别记录静息状态及不同剂量负荷时左室室壁运动情况,并计算静息状态、小剂量(10μg?kg·min)及峰值剂量(40μg?kg·min)负荷时CAD组室壁运动积分(WMSI)的变化。结果:共观察544个心肌节段,CAD组在LDDSE中运动改善者81个,其中75个节段在DSE中发生双相反应,被视为存活心肌。CAD组WMSI静息(b)、小剂量(l)、大剂量(p)时分别为1.36±0.21(P<0.001),1.17±0.16(P<0.001),1.48±0.20(P<0.05)。结论:DSE对CAD病人存活心肌的无创性诊断具有应用价值,LDDSE检测CAD患者存活心肌具有较高的敏感性,但特异性低于DSE双相反应方法。     

组织速度成像定量左室心肌局部收缩功能储备的研究

目的探讨组织速度成像(TVI)结合小剂量多巴酚丁胺负荷超声心动图(LDDSE)定量左室心肌局部收缩功能的可行性。方法对31例经冠脉造影确诊、有节段性室壁运动异常的冠心病患者,平均年龄(61±11)岁,进行LDDSE试验,根据室壁运动记分在LDDSE时有无改善,将室壁运动异常节段分为存活组(118个节段)和无存活组(216个节段)。入选正常对照组16例行TVI检测。测量正常对照组静息时各节段收缩期速度(Sm)和舒张早期的速度(Em),测量冠心病组静息时和10μg.kg-1.min-1时的Sm和Em。结果左室心肌基底段、中间段和心尖段分别进行比较,异常节段组Sm和Em与正常对照组相应节段相比有明显的不同(P<0.05)。在LDDSE试验期间,存活组Sm和Em与静息时相比均明显提高(P<0.01);而无存活组,无论是Sm还是Em均无明显改变(P>0.05)。静息时存活组和无存活组之间的Sm在基底段和中间段比较差异无统计学意义(P>0.05)。利用受试者工作特征(ROC)定义阳性诊断的Sm差值(dSm)的界值>1.30 cm/s判断存活心肌的灵敏度为85%,特异度为100%。结论TVI结合LDDSE得出的心肌速度可以定量局部左室收缩功能储备,为无创、简单评价存活心肌提供了一个有价值的指标。     

多巴酚丁胺超声心动图负荷试验与放射性核素心肌灌注显像对心肌存活性的对比研究

目的 评价小剂量多巴酚丁胺超声心动图负荷试验(DSE)和放射性核素心肌灌注显像(SPECT)预测心肌存活性的价值。方法 以15例成功行经皮冠脉介入治疗(PCI)患者术后6个月室壁运动改善为检验标准，进行小剂量多巴酚丁胺超声心动图负荷试验及SPECT检查，比较两者检测心肌存活性的准确性。结果 小剂量多巴酚丁胺超声心动图负荷试验峰剂量期与低剂量期在预测心叽存活敏感性、阴性预测差异具有显著性意义；与DSE相比，SPECT具有较高的敏感性但其特异性较低。结论 DSE与SPECT检测心肌存活性的准确性各有优点，但DSE更具实用性。     

硝酸甘油介入双核素心肌显像评估冠状动脉性心脏病

目的 对比观察多巴酚丁胺~(201)Tl负荷-再分布/硝酸甘油介入~(99m)Tc-MIBI心肌灌注显像诊断冠状动脉疾病(CAD)及检出存活心肌的作用.方法 对132例临床疑诊CAD而拟行经皮冠状动脉介入治疗患者进行多巴酚丁胺~(201)Tl负荷-再分布/硝酸甘油介入~(99m)Tc-MIBI心肌灌注显像,全部患者于2周内接受冠状动脉造影,23例心肌梗死患者接受经皮冠状动脉介入治疗(PCI),治疗前及治疗后3个月内采用超声心动图进行随访,判断心室壁活动改善情况.结果 以冠状动脉造影显示狭窄程度≥50%为狭窄判定标准,诊断 CAD灵敏度、特异度、准确率分别为93.41%、87.80%和91.67%,检出左前降支狭窄的灵敏度、特异度、准确率分别为93.85%、91.04%和92.42%,左回旋支分别为86.79%、89.87%和88.64%,右冠状动脉分别为81.25%、82.14%和81.82%.23例心肌梗死患者总共207个心肌节段中,再分布~(201)Tl图像发现113个放射性稀疏缺损心肌节段,硝酸甘油介入~(99m)Tc-MIBI图像发现52个心肌节段可逆性放射性填充,61个心肌节段未发现放射性填充.超声心动图随访见术前113个再分布~(201)Tl图像异常节段中,47个节段有明确的心室壁活动改善,66个节段无明显改善.以PCI术后心室壁活动改善为心肌存活的指标,硝酸甘油介入~(99m)Tc-MIBI显像对存活心肌检测的灵敏度、特异度和准确率分别为87.23%、83.33%和84.96%.结论 多巴酚丁胺~(201)Tl负荷-再分布/硝酸甘油介入~(99m)Tc-MIBI心肌灌注显像能准确诊断CAD,有效检出存活心肌,有助于指导CAD诊疗.     

声学造影心肌灌注显像和多巴酚丁胺负荷超声心动图试验检测存活心肌的实验研究

本文应用声学造影心肌灌注显像（ＭＣＥ）和小剂量多巴酚丁胺负荷超声心动图试验（２ＤＥ－ＤＳＥ）检测６条犬的顿抑心肌，并与ＳＰＥＣＴ核素心肌灌注显像和病理对照。结果ＭＣＥ判别顿抑心肌的敏感性和特异性为８７％、１００％，２ＤＥ－ＤＳＥ判别顿抑心肌的敏感性和特异性分别为９１％和１００％。ＳＰＥＣＴ核素显像以存活分数为０．１作为标准时，判断顿抑心肌的敏感性为７４％；以存活分数为０．２为标准时，判断顿抑心肌的敏感性为４８％。     

Which is the better method in detecting significant left anterior descending coronary artery stenosis during contrast-enhanced dobutamine stress echocardiography: coronary flow velocity reserve or wall-motion assessment?

The diagnostic accuracy of dobutamine stress echocardiography (DSE) depends on wall-motion assessment. Coronary flow velocity reserve (CFVR) during DSE can be measured by transthoracic Doppler echocardiography. To investigate comparative diagnostic accuracy between wall-motion and CFVR assessment in the detection of significant left anterior descending coronary artery (LAD) stenosis, 274 patients underwent both contrast-enhanced DSE and coronary angiography. Intravenous contrast agent, Levovist, was injected to enhance left ventricular endocardial border delineation and coronary flow velocity in the LAD. Wall motion was assessed by standard technique, and CFVR was calculated as coronary flow velocity at peak dobutamine stress divided by baseline coronary flow velocity by transthoracic Doppler echocardiography. CFVR could be successfully obtained in 232 patients (feasibility, 85%). After excluding 14 patients with isolated diagonal stenosis, CFVR was significantly lower in 65 patients with significant LAD stenosis than it was in 153 patients without stenosis (1.62 +/- 0.56 vs 2.72 +/- 0.94, P <.001). CFVR < or = 2.0 had a 75% sensitivity, a 81% specificity, and a 79% diagnostic accuracy for detecting significant LAD stenosis, and these values were comparable with those by wall-motion analysis (sensitivity, 78%; specificity, 89%; and diagnostic accuracy, 86%). The measurement of CFVR in the LAD during DSE was feasible and the diagnostic accuracy of CFVR was equivalent to wall-motion assessment in the detection of LAD stenosis.     

Assessment of myocardial viability in patients with acute myocardial infarction by two-dimensional speckle tracking echocardiography combined with low-dose dobutamine stress echocardiography

It is clinically important to determine the myocardial viability of regional wall motion abnormality segments in patients with acute myocardial infarction (AMI). The purpose of this study was to ascertain the ability and value of a combination of speckle tracking echocardiography (STE) and low dose dobutamine stress echocardiography (LDDSE) for the evaluation of viable myocardium in patients with AMI. Forty-two hospitalized patients with AMI and left ventricular systolic dysfunction (left ventricular ejection fraction <50 %) were underwent STE in conjunction with LDDSE and dual isotope simultaneous acquisition single photon emission computed tomography (DISA-SPECT). Percutaneous coronary intervention (PCI) was performed subsequently in all patients. STE was used to measure radial, circumferential, and longitudinal end-systolic strain and peak systolic strain rate. The movement of each segment was observed by routine echocardiography 1, 3, and 6 months after PCI, and its improvement over time was the criterion of viable myocardium. The sensitivity, specificity and accuracy of DISA-SPECT for the assessment of viable myocardium were 83.6, 74.4, and 80.7 %, respectively. Among the radial, circumferential, and longitudinal strain and strain rate parameters, only longitudinal strain (LS) and longitudinal strain rate (LSr) at rest and LDDSE emerged as independent predictors of viable myocardium, When combining LS and LSr at LDDSE, the sensitivity, specificity and accuracy for the assessment of viable myocardium rose to 89.8, 90.2 and 89.9 %, respectively. The sensitivity of STE in conjunction with LDDSE was similar to DISA-SPECT for detecting viable myocardium in patients with AMI, but the specificity and accuracy of STE performed with LDDSE were higher than DISA-SPECT.     

多巴酚丁胺负荷超声结合硝酸异山梨酯检测冠心病患者存活心肌

目的 探讨硝酸异山梨酯(Isoket)对多巴酚丁胺负荷超声心动图检测的影响。方法石37例患者依据冠状动脉造影的结果分为3组：对照组12例、冠心病I组15例和冠心病Ⅱ组10例，其中冠心病Ⅱ组行标准多巴酚丁胺负荷超声(DSE)结合Isoket，其余两组行标准DSE，以冠状动脉介入性治疗(PCI)后室壁运动改善的结果作为评价DSE的标准。结果 冠心病Ⅰ组室壁运动双相反应的发生率为62．5％，存活心肌检出敏感性为61％，特异性为76％；冠心病Ⅱ组室壁运动双相反应的发生率为72．2％，存活心肌检出敏感性为82％，特异性为88％；冠心病Ⅱ组存活心肌的检出率和敏感性明显高于冠心病Ⅰ组。结论 标准DSE是检测存活心肌的可靠方法；Isoket可提高DSE存活心肌检出率。     

多巴芬酊胺超声心动图与心肌缺血

与冠脉造影及铊－２０１心肌ＳＰＥＣＴ显像对照研究疑冠心病患者２３例，评估多巴芬酊胺超声心动图在心肌缺血中的应用价值。结果表明多巴芬酊胺超声心动图检测冠脉狭窄及缺血后存活心肌的敏感度、特异度及符合率分别为７３％，７６％；７２％，８８％及７２％，８３％。评估左前降支供血节段缺血及缺血后存活心肌的能力较左旋支和右冠脉支供血节段强。     

Prediction of left ventricular contractile recovery using tissue Doppler strain and strain rate measurements at rest in patients undergoing percutaneous coronary intervention

The aim of the study was to assess the ability of tissue Doppler (TD) deformation analysis at rest to predict left ventricular contractile recovery in patients undergoing percutaneous coronary intervention (PCI). This prospective cohort enrolled 67 patients with segmental wall motion abnormality. Assessment of each segment was performed at rest and during low dose Dobutamine stress echocardiography (DSE) using a 4 point scoring system, TD peak systolic strain (PSS) and peak systolic strain rate (PSSR). The study followed up the patients for contractile improvement after 6 months of successful PCI by echocardiography. Of a 319 dysfunctional segments, 155 (49%) showed contractile recovery and 164 (51%) did not. PSS and PSSR at rest were significantly higher in recovered segments compared to segments without recovery (PSS: ?7.27?±?0.8 Vs. ?6.14?±?0.7%, PSSR: ?0.34?±?0.13 Vs. ?0.24?±?0.1/s. p?<?0.0001 both). Similarly, both parameters were significantly higher in the contractile recovery group at follow up (p?0.001). Resting PSSR as well as PSS and PSSR during DSE were significant independent predictors of contractile recovery (p?<?0.001 each). For predicting segmental contractile recovery, resting PSSR with a ?0.31/s cut-off point had 76% sensitivity and 59% specificity (AUC 0.74), DSE qualitative viability assessment had a sensitivity of 75% and specificity of 77%, DSE PSS with a cut-off point of ?9.1% had 74% sensitivity and 63% specificity (AUC 0.77) and DSE PSSR with a cut-off point of ?0.72/s had 78% sensitivity and 77% specificity (AUC 0.81). Resting PSSR is a modest predictor of segmental contractile recovery after PCI while PSSR during DSE has a comparable diagnostic performance to subjective wall motion scoring. Recovered segments show improvement of deformation parameters after PCI.     

Diastolic response during dobutamine stress echocardiography evaluated by a tissue velocity imaging technique is a sensitive indicator for diagnosing coronary artery disease.

BACKGROUND: Tissue velocity imaging (TVI) is a new method that measures regional myocardial velocities on the basis of color Doppler myocardial imaging principles. METHODS: To diagnose coronary artery disease (CAD) objectively by evaluating left ventricular diastolic responses during dobutamine stress echocardiography (DSE) with TVI, we performed DSE in 22 healthy participants and 28 patients with angina pectoris without wall-motion abnormality at rest. Before and during DSE, we measured the differences of time intervals from the R wave on electrocardiogram to the peak of early diastolic myocardial velocity in the same cardiac cycle between basal segments and midsegments in the septal (dT-S) and inferior (dT-I) walls by TVI. RESULTS: During DSE, dT-S in patients with left anterior descending CAD and dT-I in patients with right CAD were prolonged compared with that in healthy participants (both P <.01). The localization of the segments with a dT-S or dT-I during low-dose (10 microg/kg/min) dobutamine infusion of >32 milliseconds allowed the correct identification of the stenosed vessel in 87% of 23 patients for whom DSE was performed with the TVI technique before coronary angiography. CONCLUSIONS: The analysis of regional left ventricular diastolic responses to dobutamine stress using TVI was useful for the objective diagnosis of CAD.     

应变率显像检测心肌舒张起始时间对多巴酚丁胺负荷试验诱发心肌缺血的诊断价值

目的探讨心肌舒张起始时间（TR）对多巴酚丁胺负荷试验（DSE）所诱发心肌缺血的检测价值。方法选择冠心病患者35例及年龄、性别相匹配的健康志愿者20例,检测静息状态下心肌各节段TR值,冠心病组另行多巴酚丁胺负荷试验并检测最大负荷状态的TR值。结果对照组中间段TR短于心尖段（P〈0.05）及基底段TR（P〉0.05）。冠心病组静息状态运动异常的心肌与对照组比较TR值明显延长（P〈0.01）;DSE过程中各节段心肌TR普遍有所缩短,但非缺血心肌与缺血心肌相比,TR缩短程度差异有统计学意义（32%对18%,P〈0.05）,如果将DSE过程中TR变化率≤20%作为判断心肌缺血的标志,其敏感性90%,特异性78%。结论作为评价局部心肌舒缩功能的指标,TR的检测方便、快捷;DSE过程中TR变化率可以作为判断心肌缺血与否的一个定量指标。