应变率成像评价肥厚型心肌病患者左室局部心肌舒张功能

目的 探讨应变率成像(strain rate imaging,SRI)技术评价肥厚型心肌病(hypertrophic cardiomyopathy,HCM)患者左室长轴方向局部心肌舒张功能的临床价值.方法 30例HCM患者和25例健康成人,在组织多普勒速度显像条件下,分别测量长轴方向上左心室不同心肌节段的收缩期峰值应变率(SRs)、舒张期快速充盈时相和心房收缩时相的峰值应变率(SRe和SRa)、等容舒张期峰值应变率(SRIVR),并计算SRIVR/SRs及SRe/SRa值.结果 与正常组比较,HCM患者各节段SRe、SRa、SRe/SRa均减低;HCM患者同一室壁不同节段间的SRe、SRe/SRa值存在不均质性,各参数在间隔和前壁肥厚的基底及中间段显著降低(P＜0.05),以室间隔中间段减低为甚.正常组左室壁心肌各节段SRIVR绝对值差异无统计学意义(P＞0.05),HCM患者的肥厚节段负向SRIVR绝对值显著大于无增厚节段和轻度增厚节段,肥厚节段平均SRIVR/SRs＞0.6.结论 应变率成像技术可敏感检测HCM患者左室长轴方向局部心肌舒张功能的异常改变,为临床从机械力学角度评价HCM患者心肌功能异常提供了新手段.     

Abnormal postsystolic thickening in acutely ischemic myocardium during coronary angioplasty: a velocity, strain, and strain rate doppler myocardial imaging study.

We report a case in which the combination of gray scale imaging of wall thickness changes allied to color DMI regional velocity, strain, and strain rate data identified the development and regression of diastolic thickening in the acute ischemic segment during a right coronary artery percutaneous transluminal coronary angioplasty (PTCA). We also discuss the possible mechanisms and potential clinical implications of this finding.     

Quantification of regional left and right ventricular longitudinal function in 75 normal fetuses using ultrasound-based strain rate and strain imaging

Previous reports have demonstrated that myocardial velocities are not sufficiently sensitive in fetal heart studies. Strain (S) and strain rate (SR) imaging is a new noninvasive ultrasonic technique able to quantify regional myocardial deformation properties. SR imaging has a superior sensitivity than myocardial velocity for noninvasive assessment of ventricular function, but this technique has not been used in the fetal heart. Our aim was to evaluate the feasibility of S/SR imaging in the fetal heart and to study characteristics of myocardial deformation properties and their changes with the gestational age in healthy fetuses. We studied 75 normal fetuses (weeks gestation 25 +/- 4, no evidence of structural cardiovascular disease by 2-D echo and Doppler study) using S/SR imaging. Left (LV) and right ventricle (RV) peak myocardial systolic, early diastolic and SR values during atrial contraction were obtained but, for S, we measured only peak systolic values. The sample volume was placed in the mid-segment of LV septal, lateral and RV free wall. S and SR curves were obtained in all the studied population. Peak longitudinal systolic deformation was homogeneous in all the walls studied. Moreover, fetal myocardial S and SR during diastole were characterized by a higher deformation during atrial contraction than during early filling. Peak systolic and peak diastolic ratios of regional myocardial deformation properties significantly correlated with the gestational age. Inter- and intraobserver variabilities for S and SR parameters were < 15%, < 18% and < 13%, < 15%, respectively. SR imaging is feasible in selected healthy fetuses, with a limited reproducibility; we presented normal values for the fetal heart; S/SR during fetal life are homogeneous in both LV and RV; and longitudinal myocardial deformation properties increase with the gestational age.     

Assessment of myocardial regional strain and strain rate by tissue tracking in B-mode echocardiograms

To date, established ultrasonic methods for myocardial regional deformation recovery are based on the Doppler effect, which has inherent limitations restricting its accuracy and use. The reported time domain methods show in vivo insufficient accuracy. A novel approach is elaborated mimicking the human observer who reaches robust diagnosis upon the B-mode data. In a region-of-interest (ROI), acoustic markers stable for tracking are selected. A weighting index presenting the quality of tracking of each marker is used for spatial polynomial fitting. For the feasibility study, a simple straight ROI was selected, which matches the septum. A thorough proof of concept is provided by comparing with a gold standard method and by applying the method to clinical datasets. The peak systolic longitudinal strains of 12 normals were -15% + -2.3% and, of 12 patients with a light-to-mild dysfunction of the apical-septal segment, they were -9% + -0.8% (p < 0.05). Enhancements of the method using spline fitting are introduced.     

The quantification of dipyridamole induced changes in regional deformation in normal, stunned or infarcted myocardium as measured by strain and strain rate: an experimental study

Strain rate imaging (SRI) during dobutamine stress-echocardiography (DSE) has been shown to differentiate between ischemic substrates based on the segmental response. Dipyridamole stress echo (DIPSE) is currently used as an alternative to DSE in detecting coronary artery disease. The aim of this study was: (a) to determine the normal response in peak-systolic myocardial strain (S) and strain-rate (SR) during DIPSE and (b) to compare the S and SR responses of DSE and DIPSE in the same chronically ischemic/infarcted segments in the setting of single vessel disease. Methods The deformation response to DIPSE was studied in 7 normal pigs and in an additional 18 pigs, with a spectrum of ischemic substrates. S and SR data were extracted from a posterior wall “at risk” segment at baseline and during both DSE and DIPSE. The animals were divided into different ischemic substrate (stunning, non-transmural and transmural infarction), based on the DSE response as previously suggested. Results In normal myocardium, dipyridamole induced no changes in regional systolic deformation neither during nor after the infusion. Furthermore there was no detectable response in S and SR in segments with either a non-transmural or a transmural infarction. However, in myocardial segments with a DSE “stunning response”, both end systolic S and peak-systolic SR tended to “normalize” at peak dipyridamole dose. Conclusions These results suggest that dipyridamole does not induce changes in regional deformation in normal or (partially) infarcted myocardium. Only in stunned myocardium (in the setting of single-vessel disease), dipyridamole tends to normalize deformation.     

二维斑点追踪成像技术评价糖尿病患者前期右心室纵向应变及应变率

目的采用二维斑点追踪成像技术评估糖尿病前期患者右心室功能的损害。 方法选取2012年6月至2016年5月在台州恩泽医疗中心（集团）浙江省台州医院就诊的患者110例：健康对照组40例,糖尿病前期33例,2型糖尿病37例,测量右心室常规超声参数,并采用二维斑点追踪成像技术测量右心室游离壁纵向峰值应变（RVLPSF）、室间隔纵向峰值应变（RVLPSS）、右心室整体纵向峰值应变（RVLPSG）及右心室整体收缩期应变率（SRS）、舒张早期应变率（SRE）、舒张晚期应变率（SRL）。3组患者LVEDVI、LVESVI、LVEF、RVD、E/A、e/a、E/e、TAPSE、RVFAC、RVLPSF、RVLPSS、RVLPSG、SRS、SRE、SRL等测值比较,采用LSD-t检验。 结果与健康对照组比较：糖尿病前期组RVLPSF、RVLPSS、RVLPSG、SRS、SRE测值明显减低,差异均有统计学意义[（-27.89±4.11）% vs（-21.78±3.62）%,（-20.08±4.11）% vs（-16.88±2.68）%,（-23.98±2.96）% vs（-19.33±2.13）%,-1.67±0.25 vs -1.18±0.24,1.84±0.23 vs 1.35±0.20,t=3.45、3.42、3.44、3.44、3.43,P均<0.01];糖尿病组RVLPSF、RVLPSS、RVLPSG、SRS、SRE测值明显减低,差异有统计学意义[（-27.89±4.11）% vs（-20.97±3.88）%,（-20.08±4.11）% vs（-15.42±1.92）%,（-23.98±2.96）% vs（-18.19±2.29）%,-1.67±0.25 vs -1.08±0.23,1.84±0.23 vs 1.18±0.27,t=3.43、3.45、3.43、3.42、3.42,P均<0.01]。与糖尿病前期组比较：糖尿病组SRE明显减低,差异有统计学意义（1.35±0.20 vs 1.18±0.27,t=3.45,P <0.01）。 结论在糖尿病前期右心室的舒张功能与收缩功能已受到损害,斑点追踪成像可定量评估这种损害程度。     

应变率与应变显像对冠心病局部心肌收缩后收缩的研究

目的应用应变率与应变显像评价冠心病局部心肌收缩后收缩(PSS)的特点并探讨其临床意义。方法应用应变率、应变显像对48例冠心病患者和42例正常人左心室不同节段径向、纵向收缩期峰值应变率(SRS)、应变(εS)和PSS的峰值应变率(SRPSS)及应变(εPSS)进行测定。对比分析冠心病组狭窄冠状动脉供血节段(狭窄节段)和对照组相应正常节段(正常节段)的各项参数。结果冠心病组所有部位狭窄节段PSS的检出率均显著高于对照组正常节段,狭窄节段与正常节段径向PSS检出率分别为67.0%和14.3%(P<0.01),纵向PSS检出率分别为66.2%和17.2%(P<0.01)。各室壁狭窄节段的径向、纵向峰值SRS和εS均明显低于正常节段(P<0.05)。各室壁狭窄节段的SRPSS/SRS均明显大于正常节段(P<0.05)。除基底段纵向εPSS外,余各部位狭窄节段中的εPSS均显著大于正常节段(P<0.05)。心尖部狭窄节段中的纵向SRPSS明显大于正常节段(P<0.05),余各部位狭窄节段的SRPSS与正常节段比较差异均无统计学意义。结论冠心病局部心肌PSS的检出率显著高于正常心肌,病理性PSS具有较明显特点,易与生理性PSS区分。     

Dobutamine induces ineffective work in regional ischaemic myocardium: an experimental strain rate imaging study

In the present study, we sought to investigate the effects of differing inotropic conditions on regional myocardial function in ischaemic segments. In an experimental pig model ( n =11), the regional deformation parameters peak systolic strain rate [SR(SYS) (peak velocity of thickening)], systolic strain [epsilon(SYS) (systolic wall thickening)] and post-systolic strain [epsilon(PST) (ongoing wall thickening after end of systole)] were measured during normal perfusion and regional ischaemia of the posterior wall. These parameters were compared with global contractility [E(ES) (end-systolic elastance)] measured by a conductance catheter. Ischaemia was induced by an active coronary hypoperfusion in the circumflex coronary artery. Measurements were done at baseline, during dobutamine and during esmolol infusion. In normal perfused hearts, SR(SYS) (4.8+/-0.2 s(-1) at baseline) increased during dobutamine infusion, decreased during esmolol infusion and correlated significantly with global E(ES). In addition, epsilon(SYS) averaged 93+/-3% at baseline and there was almost no epsilon(PST) (4+/-1%) in normal myocardium. In ischaemic myocardium, SR(SYS) and epsilon(SYS) were significantly reduced compared with normal myocardium at baseline (SR(SYS)=2.8+/-0.3 s(-1), and epsilon(SYS)=43+/-6%; P <0.001 compared with normal perfused hearts), whereas global E(ES) was unchanged. In contrast, epsilon(PST) was significantly increased in regional ischaemic segments compared with the non-ischaemic myocardium (15+/-2%; P <0.001). During the dobutamine infusion, SR(SYS) remained unchanged. In contrast, epsilon(SYS) decreased (25+/-5%; P <0.001) and epsilon(PST) increased (25+/-4%; P <0.05) significantly during dobutamine infusion in ischaemic myocardium. In ischaemic segments, an inotropic stimulation with dobutamine resulted in a shift of strain from systole (epsilon(SYS)) to post-systole (epsilon(PST)). Thus dobutamine induced ineffective myocardial work in ischaemic segments.     

Quantification of regional left and right ventricular radial and longitudinal function in healthy children using ultrasound-based strain rate and strain imaging.

BACKGROUND: Noninvasive assessment of left (LV) and right (RV) ventricular function in children could benefit from a technique that would characterize local myocardial deformation. Color Doppler myocardial imaging (CDMI) allows the calculation of either local longitudinal or radial Strain Rate (SR) and Strain (epsilon). To determine the clinical feasibility and reproducibility of longitudinal and radial SR and epsilon, the following study was carried out. METHODS: CDMI data were obtained from 33 healthy children (4-16 years). To quantify regional longitudinal and radial function SR and epsilon data were obtained from apical and parasternal views respectively. From the extracted SR curves, peak values for systole, early diastole, and late diastole were calculated. From the extracted epsilon curves the systolic, early and late diastolic epsilon values were calculated. RESULTS: LV longitudinal deformation were homogeneous for LV basal, mid and apical segments (peak systolic SR: -1.9 +/- 0.7 s(-1), systolic epsilon -25% +/- 7%). Longitudinal SR and epsilon values were significantly higher and heterogeneous in the RV (compared with LV walls) and were maximal in the mid part of the RV free wall (peak systolic SR: -2.8 +/- 0.7 s(-1), systolic epsilon -45% +/- 13%). The RV inferior wall showed homogeneous but lower longitudinal SR and epsilon values. The LV systolic and diastolic SR and epsilon values were higher for deformation in the radial direction compared with the longitudinal direction (radial peak systolic SR: 3.7 +/- 0.9 s(-1), radial systolic epsilon 57% +/- 11%; P <.0001). The interobserver variability for radial systolic epsilon and SR was 10.3% and 13.1%, respectively. CONCLUSION: Ultrasound-based Strain SR/epsilon imaging is a practical, reproducible clinical technique, which allows the calculation of regional longitudinal and radial deformation from both LV and RV segments. The combination of regional SR/epsilon indices and the timing of specific systolic or diastolic regional events may offer a new noninvasive approach to quantifying regional myocardial function in congenital and acquired heart disease in children.     

Strain and strain rate imaging: a new clinical approach to quantifying regional myocardial function.

On the basis of color Doppler myocardial motion data, 1-dimensional regional natural strain rate and strain curves can now be calculated by comparing local myocardial velocity profiles. Such deformation data sets may be an important, new, and more sensitive approach to quantifying both regional radial and long-axis function of the left or right ventricle in both acquired and congenital heart disease. The normal ranges of regional velocity, strain rate, and strain values have already been determined in both adults and children. This review will focus both on the potential clinical applications of these new ultrasound-based deformation parameters and the current limitations inherent in implementing the technique in everyday practice.     

Recovery of stunned myocardium in acute myocardial infarction quantified by strain rate imaging: a clinical study.

BACKGROUND: Strain rate (SR) imaging (SRI) is a tissue Doppler-based method of regional myocardial deformation imaging. The aim of this study was to see whether SRI could quantify changes in myocardial mechanical function after an acute myocardial infarction, and to follow the time course of these changes. METHODS: In all, 26 consecutive patients with first-time acute myocardial infarctions were examined on days 1, 7, and 90. Segments were analyzed with SRI and wall-motion score. RESULTS: Peak systolic SR in infarcted segments increased significantly in magnitude from day 1 to 7 (-0.45 to -0.68 s -1 , P < .001), but not after day 7. The deformation rate in border zone segments also increased significantly from day 1 to 7 (-0.8 to -0.95 s -1 , P < .05), with no further significant changes at 3 months. In normal segments, peak systolic SR decreased in magnitude during the first week. Systolic strain showed similar results as peak systolic SR. CONCLUSION: SRI can demonstrate small changes in deformation rate from midinfarct through the infarct and border zone to normal myocardium. It can also show changes over time, probably as a result of recovery of stunned myocardium.     

超声应变显像技术评价肥厚性心肌病局部心肌功能的探讨

目的探讨超声组织应变显像(SI)技术评估肥厚性心肌病(HCM)患者局部心肌收缩与舒张功能的价值.方法 HCM患者30例,25例正常人为对照组.选取标准的心尖四腔切面,在心动周期中分别测量室间隔与左室侧壁基底段、中间段、心尖段沿心脏长轴方向上的收缩期峰值应变(εet),观察HCM组出现的收缩期反向应变节段;统计两组室间隔中段和后壁中段的收缩后应变(PSS)节段数并计算其幅度值;将室间隔中段的应变值与室壁厚度进行相关分析.结果①正常组各节段εet从心底至心尖呈逐渐减低趋势,但节段间差异无显著性意义(P＞0.05);②HCM组与正常组εet比较,HCM组各节段应变均显著降低(P＜0.05);③HCM组内室间隔中段应变最低,与基底段、心尖段比较差异有显著性意义(P＜0.05),本组病例大约40%的肥厚节段收缩期可见反向应变;④病变组和正常组均存在PSS,然而与病变组比较正常组PSS节段少、幅度低(P＜0.05);⑤HCM组和正常组室间隔中段的εet与室壁厚度密切相关(r＝0.83).结论 HCM患者无论肥厚节段或非肥厚节段均存在收缩舒张功能减低,且以肥厚节段病损更重,应变显像技术能对其进行准确评价.     

超声应变和应变率成像技术评价肥厚型心肌病左室局部心肌的收缩功能

目的分析肥厚型心肌病（HCM）左室局部心肌应变（ε）和应变率（SR）的变化特点,评价HCM患者左室局部心肌的收缩功能。方法收集18例HCM患者和31例正常对照者,采集心尖四腔、二腔、长轴切面的动态图像,取样容积置于左室各节段心内膜下心肌,获取同步的心肌运动曲线、应变曲线和应变率（SR）曲线,测量收缩期最大应变（εsys）、峰值应变（εpeak）和收缩期峰值应变率（SRsys）。结果HCM组有15个左室心肌节段εsys、εpeak低于对照组,有6个左室心肌节段Srsys低于对照组（P〈0．05或P〈0．01）。HCM有7例患者左室部分节段心肌出现收缩期伸展现象。结论应变和应变率成像技术能准确反映HCM患者左室局部心肌收缩功能减退,并能显示左室局部心肌收缩期伸展现象。     

斑点追踪评价正常成人右室长轴心肌形变能力

目的应用斑点追踪技术定量分析正常成人右室局域心肌形变能力,并探讨年龄对形变能力的影响。方法应用斑点追踪成像技术测量75例健康成人的右室游离壁各节段心肌应变及应变率,在二维应变的模式下于心尖四腔观上勾画右室心内膜面,测量并记录右室游离壁基底段、中段及心尖段收缩期峰值应变(ε)、收缩期峰值应变率(SRs)、舒张早期峰值应变率(SRe)、舒张晚期峰值应变率(SRa)及舒张早期峰值应变率与舒张晚期峰值应变率的比值(SRe/SRa),比较各节段间变化规律及各指标随年龄增加的变化规律。结果右室基底段ε、SRs、SRe、SRa显著高于心尖段,SRs、SRe高于中段,SRe/SRa各节段间无差异。SRe随年龄增长而轻度减低,与年龄呈负相关(r=-0.229～-0.301,P<0.05),SRa随年龄增长而增加,与年龄呈显著正相关(r=0.438～0.525,P<0.01),SRe/SRa随年龄增长而明显减低,与年龄呈显著负相关(r=-0.466～-0.614,P<0.01)。结论斑点追踪技术可以准确、客观的评估右室长轴心肌收缩期、舒张期形变的能力。右室舒张期形变能力随年龄增加而减低。     

正常人心肌应变及应变率定量分析

目的 定量研究我国成年人心肌应变及应变率的正常值范围、心肌各节段之间的差异，以及与年龄和性别的关系。方法 应用GE Vivid 7超声仪及Q-analyze软件对50例健康者左右心室心肌各节段进行应变和应变率定量分析。结果 左室基底段、中间段和心尖段的应变和应变率依次递减，基底段最大，心尖段最小。左室基底段室间隔、前壁、后壁、下壁和侧壁的应变和应变率差异无显著性意义。右室中间段的应变和应变率最大，右室基底段的应变大于左室，右室中间段和心尖段的应变和应变率测量值均明显大于左室，性别和年龄对左右心室肌应变和应变率的影响不大。结论 应变或应变率成像能够定量分析局部心肌的变形，为临床评价心功能提供了又一有效工具。     

Can changes in systolic longitudinal deformation quantify regional myocardial function after an acute infarction? An ultrasonic strain rate and strain study.

OBJECTIVES: The aim of this study was to evaluate the additional value of ultrasonic strain rate and strain to myocardial velocity in the identification and quantification of regional asynergy after an acute myocardial infarction (MI). METHODS: Forty patients (59 +/- 13 years) were investigated 3 +/- 2 days after a first infarction and compared with 14 age-matched controls with normally contracting segments (group A, n = 146). Longitudinal myocardial velocities, strain rate (SR) and strain (epsilon) were postprocessed from basal, mid, and apical segments interrogated using apical views. In a subset of patients with coronary angiograms (n = 24), myocardial segments were divided into 3 groups: normally contracting segments supplied by a normal coronary artery (group B1), normally contracting segments supplied by a diseased coronary artery (group B2), and segments with abnormal motion (group B3). Velocities were decreased in patients with myocardial infarction (MI) (P <.05 vs controls) but failed to accurately differentiate normally from abnormally contracting segments. At the opposite end, systolic SR and epsilon decreased significantly with segmental asynergy severity and could identify infarct-involved segments (group B3) with a sensitivity/specificity of 85% (systolic SR and epsilon cutoff values of -0.8 s(-1) and -13%, respectively). CONCLUSION: Strain rate and strain can better assess segmental dysfunction severity than myocardial velocities alone after an acute MI.     

In vitro strain measurement in the porcine antrum using ultrasound doppler strain rate imaging

Strain rate imaging (SRI) enables study of deformation in soft tissues. The aim of this study was to evaluate the accuracy of SRI in measuring strain in the porcine antral wall in vitro. An experimental set-up enabled controlled distension of a porcine stomach in a saline reservoir. Radial strain obtained by SRI was compared with radial strain calculated from B-mode ultrasonography. Circumferential strain obtained by SRI was compared with circumferential strain calculated from sonomicrometry. The agreement between radial strain values measured by SRI and B-mode, along and across several ultrasound (US) beams, using US frequency 6.7 MHz and strain length (SL) = 1.9 mm was = -1.0 +/- 12.1% and 0.5 +/- 13.4%, respectively (mean difference +/- 2SD%) and it was better than with SL 1.2 mm. Compared with sonomicrometry, SRI-determined circumferential strain using 6.7 MHz and SL = 1.9 mm was less accurate, whether averaging along or across several US beams (-9.2 +/- 46.7% and 13.8 +/- 51.2%, respectively). In conclusion, SRI gave accurate measurement of radial strain of the antral wall, but seemed to be less accurate for measurement of circumferential strain for this in vitro set-up.     

应变及应变率成像评估心肌桥患者局部心肌缺血的价值

目的探讨定量组织速度成像和应变及应变率评估冠状动脉心肌桥引起局部心肌缺血的临床价值。方法冠状动脉前降支心肌桥患者47例(心肌桥组)与冠状动脉正常者40例(对照组),测量前降支支配区域9个节段的收缩期峰值速度、峰值应变及应变率、舒张早、晚期峰值速度、舒张早、晚期峰值应变及相应的应变率。结果与对照组比较,心肌桥组前间隔各节段、前壁基底段及中间段、后间隔中间段收缩期峰值速度及峰值应变率明显减低(P<0.05);前间隔基底段和中间段舒张早期、晚期峰值速度及舒张早期峰值应变率明显减低(P<0.05);前壁基底段、前间隔各节段收缩期峰值应变,前壁、前间隔舒张晚期峰值应变明显减低、侧壁心尖段明显升高(P<0.05)。结论定量组织速度成像和应变及应变率可定量检测冠状动脉心肌桥引起的心肌缺血。     

应变及应变率成像评价酒精性心肌病右心室纵向心肌局部舒缩功能的价值

目的探讨应变及应变率成像技术评价酒精性心肌病（ACM）右心室纵向心肌局部舒缩功能的价值。方法酒精性心肌病患者30例（AcM组）和健康志愿者30例（正常对照组）,分别检测两组常规超声参数、应变及应变率参数。应变及应变率参数通过心尖四腔切面右心室游离壁3个节段的应变及应变率曲线获取,并测量每一曲线上的收缩期和舒张期峰值。收缩期参数包括：右心室游离壁基底段、中间段和心尖段收缩期应变峰值（S）、收缩期应变率峰值（SRs）;舒张期参数包括：舒张早期应变率峰值（SRe）和舒张晚期应变率峰值（SRa）。结果ACM组右心室前后径较正常对照组显著增厚,差异有统计学意义（P〈0．05）,但右心室射血分数略微减低,差异无统计学意义。ACM组右心室游离壁基底段、中间段和心尖段s、SRs、SRe和SRa与对照组比较均显著减低,差异均有统计学意义（P〈0．05）。结论应变及应变率成像可作为评价ACM右心室纵向心肌局部舒缩功能的一种无创的、有效的新方法。     

应变率显像定量评价冠状动脉旁路移植术后左心室局部功能

目的 探讨应变率显像(SRI)技术在评价冠心病患者冠状动脉旁路移植术前后左心室局部功能变化中的应用价值.方法 对16例冠心病患者分别于冠状动脉旁路移植术前3 d、术后12 d及3个月行超声心动图检查,应用SRI技术对左室各壁基底段和中间段的局部心肌功能进行定量分析,共分析192个节段.根据术前二维超声心动图室壁运动情况将心肌节段分为运动正常组(152个节段)和运动异常组(40个节段).结果 术前运动正常组收缩期心肌峰值应变率(SRs)和舒张早期心肌峰值应变率(SRe)与运动异常组相比差异无统计学意义(P>0.05).运动异常组术后3个月的房缩期心肌峰值应变率(SRa)较术前3 d增高(P<0.05).运动正常组术后3个月与术前3 d相比,SRs、SRa及SRe均增高(分别P<0.05和0.01),术后3个月与术后12 d相比,SRs增高(P<0.05).结论 应用SRI技术能定量评价冠状动脉旁路移植术前后左室局部心肌功能的改变.