应用定量组织速度成像技术结合小剂量多巴酚丁胺负荷试验诊断冠心病

目的　探讨应用定量组织速度成像 (QTVI)技术结合小剂量多巴酚丁胺负荷超声心动图试验(LDDSE)诊断冠心病的价值。方法　对经冠状动脉造影证实的 3 0例冠心病患者及 10例正常人进行LDDSE检查。应用QTVI技术分别同步获取各受检者在LDDSE前后室间隔和左室下壁的二尖瓣瓣环、基底部、中部及心尖部 4个不同取样点心肌组织的时间 速度曲线 ;根据各曲线分别测量出同一室壁各取样点从心电图R波到舒张早期心肌峰值速度的时间 ,计算它们之间的最大差值 (dTRE) ;测量出从心电图R波到心房收缩期心肌峰值速度的时间 ,计算它们之间的最大差值 (dTRA)。结果　小剂量 (10 μg·kg-1·min-1)多巴酚丁胺负荷超声心动图试验时 ,左前降支病变患者的室间隔dTRE较静息状态时明显升高 [(4 8± 19)ms对 (2 1± 10 )ms ,P <0 .0 1] ;右支病变患者的左室下壁dTRE较静息状态时明显升高 [(5 2± 17)ms对 (2 3± 10 )ms ,P <0 .0 1] ;双支病变患者的室间隔及左室下壁dTRE较静息状态时均明显升高 [室间隔 :(4 9± 15 )ms对 (2 2± 8)ms ,P <0 .0 1;左室下壁 :(5 4±12 )ms对 (2 1± 15 )ms ,P <0 .0 1] ;正常对照组室间隔及左室下壁的dTRE较静息状态时均无明显改变。以dTRE>3 5ms作为截断值诊断冠心病的敏感性为 85 % ,特异性为 89%。     

Transesophageal dobutamine stress echocardiography with tissue Doppler imaging for detection and assessment of coronary artery disease.

BACKGROUND: Transesophageal dobutamine stress echocardiography (T-DSE) has been shown to be a sensitive and specific technique for the detection of myocardial ischemia. A major limitation of echocardiographic study interpretation, however, is the subjective visual analysis of endocardial motion and wall thickening, which is only semiquantitative. METHODS: To analyze whether T-DSE with the use or tissue Doppler imaging (TDI) during graded dobutamine infusion may be useful to detect and quantify stress-induced myocardial ischemia by changes in myocardial velocities, 70 patients undergoing coronary arteriography were studied with T-DSE and TDI. Midesophageal and transgastric short- and long-axis images were obtained at each level of dobutamine infusion. T-DSE was successful in 67 patients (96%). Baseline resting pulsed and color peak systolic (S) and early diastolic (E) velocities of the anterior, septal, lateral, and inferior walls were examined. RESULTS: Pulsed and color TDI correlated well at rest and after stress. Fifteen patients had a normal response to dobutamine, and 52 patients had inducible ischemia by two-dimensional criteria. In the normal group, there was a significant dose-dependent increase in S and E velocities. Compared with those in the normal group, patients with coronary artery disease (CAD) had lower resting S and E velocities and blunted S wave increase or E wave decrease during DSE. CONCLUSIONS: T-DSE with TDI is a feasible and accurate test for the quantitative assessment of patients with CAD who have impaired augmentation of systolic and diastolic myocardial velocities during dobutamine infusion.     

多巴酚丁胺负荷组织速度成像与心肌SPECT诊断老年冠心病的对比观察

目的 以CAG为金标准,与ATP负荷^99mTc-MIBI心肌SPECT对比,探讨多巴酚丁胺负荷定量组织速度成像(DSE+QTVI)诊断老年冠心病的临床价值。 方法 98例入选者接受DSE+QTVI,其中40例接受ATP负荷SPECT检查,并均在2周内接受CAG。在DSE+QTVI检查过程中测定不同多巴酚丁胺负荷剂量时各室壁中段收缩期心肌运动峰值速度(Vpeak)。 结果 Vpeak在多巴酚丁胺20 μg/(kg·min)负荷量时其诊断老年冠心病的敏感度和特异度最高,分别为80.43%、81.58%;在多巴酚丁胺40 μg/(kg·min)负荷剂量时,敏感度和特异度最低,分别为52.94%、69.57%。与ATP负荷SPECT相比,Vpeak诊断老年冠心病的敏感度、特异度略低。 结论 DSE+QTVI诊断老年冠心病是安全、有效、无创的方法。     

多巴酚丁胺负荷超声心动图结合组织多普勒成像诊断冠心病

目的探讨多巴酚丁胺负荷超声心动图(DSE)结合组织多普勒成像(TDI)在冠心病(CHD)诊断中的应用价值.方法选择胸闷或胸痛怀疑CHD的患者50例,应用TDI测量静息状态下以及多巴酚丁胺峰值负荷状态下左心室前壁中段收缩峰值速度(Vs),所有入选对象均进行冠状动脉造影,并根据左前降支狭窄程度是否≥50%分为左前降支狭窄组(LST组,17例)与左前降支非狭窄组(non-LST组,20例).结果左心室前壁中段Vs在静息状态下LST与non-LST组比较差异无统计学意义(P＞0.05),在多巴酚丁胺峰值负荷状态下差异有非常显著性(P＜0.01),且Vs增加幅度2组相比差异也有非常显著性(P＜0.01).结论DSE结合TDI是诊断CHD有价值的定量分析方法,DSE在诊断CHD时的敏感性、准确性明显优于静息状态超声心动图.     

Cardiovascular response in patients with and without myocardial ischaemia during dobutamine echocardiography stress test for coronary artery disease

Summary. Dobutamine is widely used in cardiac stress testing for coronary artery disease and myocardial viability. To assess the systemic cardiovascular response during dobutamine echocardiography stress testing, we investigated nine patients without myocardial ischaemia (group 1, aged 48 to 72 years) and nine patients with myocardial ischaemia during the test (group 2, aged 53 to 73 years), by use of Doppler/echocardiography and subclavian artery pulse trace calibrated with brachial artery pressures. Peripheral resistance, total arterial compliance, and aortic characteristic impedance were estimated using a 3-element windkessel model of the systemic circulation. During infusion of dobutamine up to 40 μg kg^-1 min^-1, arterial pressure was maintained near baseline levels, whereas heart rate and cardiac index increased, more so in group 1 (mean: 89 and 79%) than in group 2 (58 and 52%; P<0.05 vs. group 1). Peripheral resistance was decreased by ≥32% at peak stress, whereas characteristic impedance was maintained at or above baseline in both groups, and total arterial compliance was not significantly altered. The cardiovascular response in group 2 was not influenced by the wall motion abnormalities. Thus, in these patients the inotropic, chronotropic, and vasodilatory effects of dobutamine balanced the ischaemic impairment of left ventricular function during the stress test.     

Coronary artery vasospasm during dobutamine stress echocardiography.

Compared with the frequent occurrence of S-T segment depression, the development of S-T segment elevation during dobutamine stress echocardiography is a relatively rare finding, especially in the setting of nonobstructive coronary artery disease. We present two patients who developed chest discomfort with S-T segment elevation during dobutamine stress testing. Both patients had unremarkable baseline echocardiograms and no history suggestive of coronary vasospasm. Subsequent coronary angiography revealed nonobstructive disease. It is speculated that the likely presence of endothelial dysfunction coupled with mild coronary atherosclerosis caused an imbalance between the coronary vasodilatory and vasoconstrictive forces. The inhibition of the vasodilatory effects of beta-adrenergic receptor stimulation and flow-mediated dilation of dobutamine was overcome by the vasoconstrictive effects of dobutamine-stimulated alpha-1 receptor activation; thus, contributing to the development of coronary vasospasm. This condition is important to recognize and appreciate as the initial treatment for this condition favors the use of nitrates over beta-blockade.     

多普勒组织成像技术分析冠心病患者多巴酚丁胺超声负荷试验中缺血心肌运动的变化

目的：探讨多普勒组织成像技术（DIT）定量分析多巴酚丁胺超声负荷试验（DSE）过程中缺血心肌室壁运动的特征。方法：分别对14例正常人和20例冠心病患者采用标准的DSE方案（0－40μg.kg^-1.min^-1），使用DIT技术于静息状态，小剂量（10μg.kg^-1.min^-1）及峰值剂量（40μg.kg^-1.min^-1）负荷时观察心肌运动速度的变化，记录各室壁节段收缩期的峰值速度，峰值速度运动时间，综合计算平均收缩期室壁运动峰值速度和平均峰值速度运动时间，结果：随着多巴酚丁胺药物剂量的增加，正常组平均峰值速度均逐渐增加，平均峰值速度运动时间逐渐缩短；冠心病组平均峰值速度小剂量负荷时增加，大剂量时则下降，平均峰值速度运动时间呈逐渐缩短趋势，两组间各指标相比差异有显著性意义（P＜0．001）。结论：DTI技术与DSE结合可定量评价缺血心肌室壁运动异常，对冠心病缺血心肌的无创性诊断具有应用价值。     

Acute infarction of a previously stented coronary artery precipitated by dobutamine stress echocardiography.

A case is reported of acute myocardial infarction (MI) in a previously stented left anterior descending coronary artery, which occurred shortly after uneventful dobutamine stress echocardiography. Myocardial infarction precipitated by dobutamine has been reported only rarely, as has exercise-related MI after stenting. This is the first case of dobutamine-induced MI in a recently stented artery.     

Simultaneous dobutamine stress echocardiography and dobutamine scintigraphy (99mTc-MIBI-SPET) for assessment of coronary artery disease

Background: Simultaneous dobutamine stress echocardiography (DSE) and^99mTc-MIBI-SPET (DMS) for the evaluation of the presence and the extent of coronary artery disease (CAD) were assessed for a head to head comparison regarding the diagnostic accuracy of the two tests. Methods and Results: Forty-five consecutive patients (33 males and 12 females: 53±6.8 yr.) underwent exercise electrocardiography and simultaneous dobutamine stress echocardiography and MIBI-SPET imaging. Coronary angiography was performed in all patients (significant coronary stenosis > 50%). On the basis of the results of exercise electrocardiogram the pre-test probability for coronary artery disease (Diamond's algorithm) was low (45.6±12.7 %). The overall specificity, sensitivity and predictive accuracy of Echo-dobutamine stress test for diagnosis of the presence or absence of CAD were: specificity 82%, sensitivity 76%, diagnostic accuracy 80%, positive predictive value 90%, negative predictive value 40%. The overall specificity, sensitivity and predictive accuracy of MIBI-SPET-dobutamine test for diagnosis of the presence or absence of CAD were: specificity 86%, sensitivity 87%, diagnostic accuracy 84%, positive predictive value 97%, negative predictive value 54%. MIBI-SPET-dobutamine test showed a significantly higher sensitivity in comparison with ECHO-dobutamine test (P<0.05). Conclusion: Both noninvasive methods for the detection of CAD showed a good diagnostic accuracy. Nevertheless the SPET model showed an higher sensitivity in comparison with DSE model, essentially in the presence of a lower extent of CAD and during submaximal test.     

仰卧位蹬车运动及多巴酚丁胺负荷超声心动图检测冠心病的对比研究

目的比较仰卧位蹬车运动负荷超声心动图(SBE)和多巴酚丁胺负荷超声心动图(DSE)检测冠心病的价值.方法43例疑为冠心病患者随机在同一时间内进行SBE和DSE检测,先做SBE检查,当心率、血压、心电图检测恢复至静息状态水平再做DSE检查.本组患者经冠状动脉造影证实为冠心病25例,正常者18例.结果SBE和DSE检测冠心病的敏感性、特异性和准确性分别为84.0%vs80.0%、88.9%vs83.3%和86.0%vs76.7%(P>0.05).结论SBE与DSE检测冠心病价值相当,SBE为生理负荷,临床上检测冠心病应首选SBE.     

多巴酚丁胺负荷超声心动图对冠心病诊断价值的研究

对43例冠心病(CAD)患者和31例健康人进行了多巴酚丁胺负荷超声心动图(DSE)检查,其诊断CAD的敏感性为90.7%,特异性为100%;与运动超声心动图(ES—2DE)相近,此法简便、安全、克服了ES—2DE的缺陷和应用限制.     

大剂量多巴酚丁胺负荷试验结合二维应变成像技术早期诊断冠心病的价值

目的 探讨大剂量多巴酚丁胺负荷试验结合二维应变成像技术早期诊断冠心病的价值.方法 对临床可疑的冠心病患者28例进行大剂量多巴酚丁胺负荷试验,分别在静息状态及各级负荷状态下观察室壁运动情况,测定左室各心肌节段心内膜下心肌的纵向收缩期峰值应变,比较大剂量多巴酚丁胺负荷试验目测法及大剂量多巴酚丁胺负荷试验结合二维应变成像技术诊断缺血心肌的敏感性和特异性;计算正常组、冠心病组缺血节段和非缺血节段的纵向收缩期峰值应变平均值并进行组内及组间比较,利用ROC曲线下面积评价纵向收缩期峰值应变预测缺血心肌的敏感性和特异性.结果 冠心病组多巴酚丁胺剂量为40μg·kg-1·min-1时目测法检出室壁运动异常6例(共20个节段),通过计算纵向收缩期峰值应变检出缺血心肌15例(共148节段);冠心病组大多数缺血节段纵向收缩期峰值应变较正常组及非缺血节段相同负荷状态明显减低(P＜0.05);大剂量多巴酚丁胺负荷试验目测法和大剂量多巴酚丁胺负荷试验结合二维应变成像技术诊断缺血心肌的敏感性分别为35.3%和88.2%(P＜0.01),特异性分别为100%和100%(P＞0.05)、准确性分别为60.7%和92.8%(P＜0.01).多巴酚丁胺剂量为40μg·kg-1·min-1时以纵向收缩期峰值应变绝对值≤14.9%为截断值,预测缺血心肌节段的敏感性和特异性分别为83.3%和91.7%.结论 大剂量多巴酚丁胺负荷试验结合二维应变成像技术可以提高检出缺血心肌的敏感性,定量评价心肌收缩功能的微小改变,发现隐匿性心肌缺血,为临床诊断早期冠心病患者提供了无创性新方法 .

Abstract：

Objective To investigate the value of high-dose dobutamine stress echocardiography combined with two-dimensional strain imaging in early diagnosis of coronary artery disease. Methods Highdose dobutamine stress echocardiography was performed to 28 patients with suspected coronary artery disease. All wall movements were observed during resting condition and at all stress levels,respectively;the peak systolic longitudinal strain in each endomyocardial segment of left ventricular was measured; the sensitivity and specificity between visual method and two-dimensional strain imaging in diagnosing myocardial ischemia with high-dose dobutamine stress echocardiography were compared. The average peak systolic longitudinal strain was calculated against control group, coronary artery disease group during ischemia segments and non-ischemia segments, and a comparison was made inside each group as well as against the other groups. The area under receiver operating characteristic curve of the peak systolic longitudinal strain was used to predict the sensitivity and the specificity of myocardial ischemia. Results With dobutamine dose of 40 μg·kg-1 · min-1 ,wall motion abnormalities were diagnosed in 6 patients (20 segments) through visual method, myocardial ischemia was found in 15 patients (148 segments) through computing the peak systolic longitudinal strain. Inside the coronary artery disease group during ischemic　segments,the majority of peak systolic longitudinal strain was significantly reduced ( P＜0.05) compared to the non-ischemic segments and the control group. In diagnosing myocardial ischemia in high-dose dobutamine stress echocardiography, the sensitivity of visual method and two-dimensional strain imaging were 35.3％ and 88.2％(P＜0.01), specificity 100％ and 100％(P＞0.05), and accuracy 60.7％ and 92.8％ (P＜0.01). The cutoff value of the peak systolic longitudinal strain was less than or equal to 14.9％, its sensitivity and specificity in predicting myocardial ischemia were 83.3％ and 91.7％,respectively. Conclusions High-dose dobutamine stress echocardiography combined with two-dimensional strain imaging can increase the sensitivity of detecting myocardial ischemia and detect concealed myocardial ischemia. High-dose dobutamine stress echocardiography combined with two-dimensional strain imaging can be used in early diagnosis of coronary artery disease.     

Moderate-dose dobutamine maximizes left ventricular contractile response during dobutamine stress echocardiography in children.

BACKGROUND: Assessment of ventricular contractile reserve by dobutamine stress echocardiography (DSE) may be a powerful tool for detection of subclinical ventricular dysfunction, however, the hemodynamic dose-response relationship during DSE in children has not been established. METHODS: To characterize changes in hemodynamics and ventricular contractility during DSE in children, 26 participants (age 8.3 +/- 4.8 years; 17 male/9 female) with normal resting left-ventricular function underwent DSE. Participants with abnormal wall motion at rest or during DSE, or rejection were excluded. Left ventricular M-mode echocardiography and carotid pulse tracings were obtained at each stage for calculation of shortening fraction, velocity of circumferential fiber shortening (VCFc), and end-systolic wall stress (WS). Contractility was expressed as the difference between actual and predicted VCFc for measured WS. Dose-response curves for shortening fraction, VCFc, WS, and contractility (the difference between actual and predicted VCFc for measured WS) were obtained. RESULTS: Stepwise changes in contractility, systolic blood pressure, WS, and left ventricular shortening fraction were observed at doses up to, but not beyond, 20 microg/kg/min. Increases in double product were observed at doses up to 30 microg/kg/min. CONCLUSIONS: DSE at a dobutamine dose of 20 microg/kg/min is optimal to fully assess contractile reserve in children. Lesser doses may provide insufficient stress, whereas higher doses may incur unnecessary increases in myocardial oxygen consumption and side effects.     

多巴酚丁胺负荷超声心动图结合心肌灌注造影早期诊断冠心病的价值

目的 探讨大剂量多巴酚丁胺负荷超声心动图(DSE)结合心肌灌注造影(MCE)技术早期诊 断冠心病的价值。方法 对临床可疑冠心病的38例患者进行大剂量多巴酚丁胺负荷试验,分别在静息状态和试验终止的即刻实行MCE检查。并在静息状态及各级负荷状态下观察室壁运动(WM)情况;对每次MEC后各心肌节段灌注状态进行评估。大剂量DSE时,以冠状动脉造影为金标准比较WM目测法和心 肌灌注状态目测法诊断冠心病的敏感性和特异性。结果 DSE时,9例(24％)患者达到峰值负荷水平,22 例(58％)达到中级负荷水平。DSE终止时,通过心肌灌注状态目测法及WM目测法诊断有心肌缺血患者 的例数分别为24例(89％)及15例(52％)(P＜0.01)。同时,通过上述两组方法评估心肌缺血,并根据相应缺血心肌节段所对应冠脉分支准确判断病变血管的敏感性分别为71％及41％(P ＜0.01)。结论 大剂量DSE结合心肌灌注造影可以提高检出缺血心肌的敏感性,发现隐匿性心肌缺血,为临床诊断早期冠心 病患者提供了无创性新方法。     

多巴酚丁胺负荷超声心动图中冠心病患者节段性室壁运？…

目的 评价多巴酚丁胺负荷超声心动图（ＤＳＥ）中冠心病（ＣＡＤ）患者节段性室壁运动异常（ＲＷＭＡ）的预后意义。方法 ＤＳＥ采用分级负荷方法,室壁运动采用１６节段分法和６节段分法,随访自ＤＳＥ之日开始,终点为出现心血管事件,结果 病例组中ＤＳＥ阳性者与ＤＳＥ阴性者免于心脏事件的累积生存率有显著性差异（Ｐ〈０．０１）,ＤＳＥ阳性、缺血节段百分数等是Ｃｏｘ比例风险模型中心脏事件的独立预测指标。结论 ＤＳＥ     

背向散射技术结合多巴酚丁胺负荷试验检测不同部位冠状动脉狭窄

目的探讨背向散射技术结合多巴酚丁胺负荷试验(DSE)能否提高对不同部位冠状动脉狭窄的检测率。方法记录32例临床疑诊为冠心病的患者在不同剂量多巴酚丁胺负荷下左室乳头肌水平短轴观的背向散射积分,按冠状动脉造影结果将心肌节段分组,比较各组心肌在各剂量负荷下背向散射积分周期变异(CVIB)值的变化。结果和正常冠状动脉供血心肌节段相比,狭窄冠状动脉供血心肌节段的CVIB值在静息状态和小剂量多巴酚丁胺负荷下无显著差异,但在大剂量负荷下明显降低。以DSECVIB<4.8dB作为检测冠状动脉狭窄的阈值,对于左前降支病变,DSECVIB法可提高敏感性、特异性和准确率;对于左旋支和右冠状动脉病变,DSECVIB法未能提高检测的敏感性,而提高了特异性和准确率。结论背向散射技术与传统DSE联合应用可提高DSE对不同部位冠状动脉狭窄的检测率,尤其对于左前降支的病变。     

组织多普勒结合腺苷负荷超声心动图试验诊断冠心病的临床研究

目的 以冠状动脉造影为金标准,评价组织多普勒结合腺苷负荷超声心动图试验(TDI-ASE)诊断冠心病的敏感度、特异度.方法 采用脉冲组织多普勒超声心动图技术(PW-DTI),对48例临床拟诊冠心病的患者分别静脉注射腺苷拟造成心肌缺血,注射剂量为140 μgkg-1min-1,用药时间6 min(总剂量0.8 mg/kg),分别测量左心室16节段的收缩期室壁运动最大速度和加速度及各节段心肌收缩的达峰时间.同时应用二维腺苷负荷超声心动图(2D-ASE)目测各节段心肌负荷前后的运动异常.结果 30例确诊为冠心病的患者中TDI-ASE阳性24例.18例冠状动脉造影正常的患者中TDI-ASE阳性有3例.应用TDI-ASE诊断冠心病的敏感度为80.0%(24/30),特异度为83.3%(15/18).而30例确诊为冠心病的患者中2D-ASE阳性22例.18例冠状动脉造影正常的患者中2D-ASE阳性有5例.2D-ASE诊断冠心病的敏感度为 73.3%(22/30),特异度为 72.2%(13/18).结论 TDI-ASE安全可行,客观准确诊断冠心病,敏感度及特异度较高.     

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。     

心肌灌注造影在多巴酚丁胺负荷前后早期诊断冠心病的临床研究

目的探讨心肌灌注造影(MCE)技术在大剂量多巴酚丁胺负荷前后早期诊断冠心病的价值.方法 对临床疑为冠心病患者38例,进行大剂量多巴酚丁胺负荷超声心动图试验,分别在静息状态和多巴酚丁胺负荷超声心动图试验终止时即刻行MCE检查.以冠状动脉造影为金标准将大剂量多巴酚丁胺负荷超声心动图前后心肌灌注状态目测法对冠心病的检出率进行比较.结果 多巴酚丁胺负荷超声心动图检查的38例患者中,9例(24%,9/38)达到峰值负荷水平,22例(58%,22/38)达到中级负荷水平.其中通过冠状动脉造影诊断的27例冠心病患者在多巴酚丁胺负荷前后,通过心肌灌注状态目测法诊断心肌缺血患者的例数分别为10例(37%,10/27)及24例(89%,24/27,χ2=15.565,P＜0.01).结论 大剂量多巴酚丁胺负荷超声心动图结合MCE可提高缺血心肌的检出率,发现隐匿性心肌缺血,为临床无创性诊断早期冠心病患者提供新方法.     

Value of additional myocardial perfusion imaging during dobutamine stress magnetic resonance for the assessment of intermediate coronary artery disease

This study was performed to assess the role of additional myocardial perfusion imaging during high dose dobutamine/atropine stress magnetic resonance (DSMR-wall motion) for the evaluation of patients with intermediate (50?C70%) coronary artery stenosis. Routine DSMR-wall motion was combined with perfusion imaging (DSMR-perfusion) in 174 consecutive patients with chest pain syndromes who were scheduled for a clinically indicated coronary angiography. When defining CAD as the presence of a????50% stenosis, the addition of perfusion imaging improved sensitivity (90 vs. 79%, P?<?0.001) with a non-significant reduction in specificity (85 vs. 90%, P?=?0.13) and an improvement in overall diagnostic accuracy (88 vs. 84%, P?=?0.008). Adding perfusion imaging improved sensitivity in patients with intermediate stenosis (87 vs. 72%, P?=?0.03), but not in patients with severe (??70%) stenosis (93 vs. 84%, P?=?0.06). In patients with severe stenosis specificity of DSMR-perfusion versus DSMR-wall motion decreased (61 vs 70%, P?=?0.001) resulting in a lower overall accuracy (71 vs 74%, P?=?0.03). Using a cutoff of ??50% for the definition of CAD, sensitivity of DSMR-perfusion compared to DSMR-wall motion was significantly higher in patients with single vessel (88 vs. 77%, P?=?0.03) and multi vessel disease (93 vs. 79%, P?=?0.03), whereas no significant differences were found using a cutoff of ??70% stenosis for the definition of CAD. The addition of perfusion imaging during DSMR-wall motion improved the sensitivity in patients with intermediate coronary artery stenosis. Overall diagnostic accuracy increased only when defining CAD as ??50% stenosis. In patients with ??70% stenosis DSMR-wall motion alone had higher accuracy due to more false-positive cases with DSMR-perfusion.