多普勒组织成像定量分析155例冠心病左心室局部收缩和舒张功能

目的 应用多普勒组织成像（ＤＴＩ）技术定量定位分析生理和病理（心肌缺血）状态下左心室局部收缩和舒张功能。方法 研究对象为１５５例确诊冠心病的患者（冠心病组）和４１例年龄匹配的正常人（对照组）。采用心尖四腔、心尖二腔和心尖长轴切面,每个室壁又选择两个取样点分别位于该室壁的基底部和中部,分别显示左心室６个室壁１２个节段运动的情况。ＤＴＩ测量参数包括收缩功能指标：心肌收缩峰值速度（Ｖｓ）和ＶＥ与舒张晚期峰值速度（ＶＡ）的比值（ＶＥ／ＶＡ）。结果 与对照组相比,冠心病组ＤＴＩ可敏感地定量显示出收缩和舒张峰值速度显著下降以及峰值时间的显著延长;前壁心肌梗死时可见病变区多个节段多项ＤＴＩ收缩和舒张功能参数异常,ＤＴＩ收缩与舒张速度指标之间、收缩速度与左室射血分数之间以及舒张功能参数ＶＥ／ＶＡ均值与二尖瓣血流频谱Ｅ／Ａ比值之     

Reference ranges for tissue Doppler measures of maternal systolic and diastolic left ventricular function.

OBJECTIVES: Tissue Doppler imaging (TDI) is an echocardiographic technique that evaluates longitudinal myocardial tissue velocities during left ventricular systolic and diastolic function, relatively independently of loading conditions. Limited data are available regarding maternal cardiac function using TDI. The aim of this study was to construct reference charts for TDI indices in normal pregnancy. METHODS: This was a cross-sectional study on 104 pregnant women at 11-38 weeks of gestation and 19 non-pregnant controls. Doppler echocardiography was used to assess transmitral inflow velocities during diastole (peak velocity of early (E) and late (A) atrial filling), whilst TDI at the septal and lateral margins of the mitral annulus measured diastolic velocities (peak velocity of early (E') and late (A') diastolic filling) and peak systolic velocity (S'). The left ventricular filling index (E : E' ratio) was derived. The Tei index (ratio of isovolumetric time to ejection time) was measured. RESULTS: Systolic function assessed by TDI S' velocity was unaltered at the septal and lateral margins, although S' velocity at the lateral margin was higher (12%, P = 0.028) in the first two trimesters, compared to non-pregnant controls. Diastolic function was modified as demonstrated by an increase in A velocity (P P = 0.024). Similarly, A' increased at the septal and lateral margins ( P < 0.001 and P = 0.02, respectively), resulting in a decrease in E' : A' ratios at the septal and lateral mitral margins ( P = 0.001 and P = 0.001, respectively). E : E' at both mitral margins and Tei index were unaltered. CONCLUSION: This study gives normal ranges for TDI indices in pregnancy. TDI demonstrated modified longitudinal systolic and diastolic function. Future studies will evaluate the potential of this technique in pregnancies complicated by hypertension and cardiac disease. Published by John Wiley & Sons, Ltd.     

多普勒组织成像评价多巴酚丁胺负荷试验中左心室长轴局部心肌收缩功能

目的　探讨大剂量多巴酚丁胺负荷试验下脉冲多普勒组织成像技术 (PW DTI)评价左心室长轴局部心肌收缩功能的临床价值。方法　冠心病患者 3 0例 (至少 1支冠状动脉主支狭窄≥ 5 0 % ) ,对照组 2 5例 ,均行大剂量多巴酚丁胺负荷试验 ,分别于静息、峰值负荷下将PW DTI取样容积置于侧壁、室间隔、前壁、下壁心肌基底段、中段心内膜下心肌采样 ,获取各节段心肌运动速度曲线。PW DTI测量指标 :收缩期峰值运动速率 (Vs)、收缩期达峰时间 (timetopeakvelocity ,TPV)、收缩期速度时间积分 (velocity timeintegral,VTI)。 结果　根据多巴酚丁胺负荷超声心动图及冠状动脉造影结果将冠心病组患者心肌节段区分为正常节段与缺血节段。与对照组相应节段 (正常组 )比较 ,静息状态下 ,冠心病缺血节段组与正常组节段间Vs、TPV、VTI并无统计学差异 ;峰值负荷下冠心病缺血节段组各节段Vs、VTI明显减低 (P <0 .0 5 ) ,而TPV则显著延长 (P <0 .0 5 )。结论　PW DTI能准确评价多巴酚丁胺负荷试验中左室长轴局部心肌收缩功能 ,从而准确无创检测冠心病缺血心肌。     

多普勒组织成像定量分析心肌梗死后左心室局部与整体的舒缩功能

目的　采用多普勒组织成像技术 (DTI)观察心肌梗死后左心室壁及二尖瓣环运动 ,定量分析左心室局部与整体的舒缩功能。方法　 18例健康人 ,3 6例心肌梗死患者均行常规二维超声 (2DE)及DTI检查。采用DTI分析心肌梗死后左室壁及二尖瓣环 4个位点的DTI指标 :峰值收缩速度 (VS)、舒张早期速度 (VE)及二尖瓣环 4个位点平均收缩与舒张速度 (VMS、VME)。结果　与健康人比较 ,心肌梗死患者室壁运动异常节段VS、VE显著降低 (P <0 .0 1) ,心肌梗死节段相对应二尖瓣环位点VS 显著降低 (P <0 .0 1) ,心肌梗死节段与非心肌梗死节段相对应二尖瓣环 4个位点VE 均降低 (P <0 .0 1) ;心肌梗死患者射血分数 (EF)与VMS(r =0 .76,P <0 .0 1)、VME(r =0 .68,P <0 .0 1)呈显著正相关 ;VMS≥ 7.0cm/s预测EF≥ 5 0 %的敏感性、特异性分别为76.0 %、81.8%。结论　DTI可定量分析心肌梗死后左室壁局部与整体的舒缩功能 ,为心肌梗死后合理选择治疗措施及预后判断提供新的定量指标     

Assessment of left ventricular systolic and diastolic function by Doppler tissue imaging in patients with preinfarction angina.

BACKGROUND: The aim of this study was assessment of left ventricular (LV) systolic and diastolic function by pulsed wave Doppler tissue imaging (DTI) in patients with or without preinfarction angina in acute myocardial infarction. METHODS: We prospectively evaluated 31 consecutive patients (4 women, 27 men; age 58 +/- 10 years) with a first acute myocardial infarction. LV systolic and diastolic function was assessed by classic methods and DTI on the third day during acute myocardial infarction. Patients were divided into 2 groups according to the presence (group 1; n = 10) or absence (group 2; n = 21) of preinfarction angina. Mitral inflow velocities and early diastolic mitral annular velocity (Em), late diastolic mitral annular velocity (Am), peak systolic mitral annular velocity, Em/Am, the ratio of early diastolic mitral inflow velocity (E) to Em, and myocardial performance index were calculated by DTI. RESULTS: Group 1 had significantly higher Em and Em/Am than group 2 (11.3 +/- 3.34 cm/s vs 7.4 +/- 2.07 cm/s, P <.0001; 1.01 +/- 0.38 cm/s vs 0.6 +/- 0.2 cm/s, P =.001, respectively). The E/Em ratio and myocardial performance index were significantly lower in group 1 than in group 2 (5.1 +/- 2.92 vs 8.10 +/- 3.15, P=.018; 0.49 +/- 0.15 vs 0.65 +/- 0.24, P =.042, respectively). Wall-motion score index was lower in those with preinfarction angina than in those without (1.6 +/- 0.36 vs 1.9 +/- 0.39; P =.04, respectively). Peak systolic mitral annular velocity and Am were not statistically different between groups (9.4 +/- 1.84 vs 8.3 +/- 2.03, P =.172; 11.7 +/- 3.07 vs 12.1 +/- 3.34, P =.72, respectively). There were no significant differences between the 2 groups regarding transmitral E velocity, atrial contraction mitral inflow velocity (A), E/A ratio, isovolumetric relaxation time, and deceleration time of the mitral E wave (P =.91, P =.08, P =.58, P =.81, and P =.71, respectively). CONCLUSION: LV diastolic function was better in patients with preinfarction angina than in patients without. This condition could not be detected by conventional mitral inflow Doppler velocities, but could be detected by DTI. This preliminary evidence shows that DTI is better than conventional mitral Doppler indices in the assessment of a favorable LV diastolic function in patients with preinfarction angina.     

组织多普勒超声心动图评价冠心病患者心室舒张功能

目的采用组织多普勒技术观察冠心病患者心室舒张功能的改变及左室和右室舒张功能的关系。方法研究24例正常健康人和20例冠心病患者,应用多普勒超声技术测量二尖瓣口及三尖瓣口舒张期血流速度;应用组织多普勒超声技术测量二尖瓣环一左室侧壁交界处及三尖瓣环一右室侧壁交界处心肌运动频谱。测量二尖瓣及三尖瓣舒张早期血流速度（E）、舒张晚期血流速度（A）及E／A,心肌舒张早期运动速度（Em）、晚期运动速度（Am）及Em／Am,测量E／Em。结果与正常组比较,冠心病组左室舒张期二尖瓣血流速度E／A显著减小（P〈0．01）,三尖瓣血流E／A亦显著减小（P〈0．01）;组织多普勒所测左右心室Em、Am、Em／Am均减小（P〈0．01）,E/Em增大（P〈0．01）;冠心病组左室与右室间E/Em比值高度相关（r=0．83）。结论冠心病患者的左室舒张功能异常,伴有右室舒张功能的改变,右室与左室舒张功能的改变相关。应用组织多普勒和频谱多普勒联合评价心室舒张功能,纠正了频谱多普勒评价心室舒张功能出现的假正常现象。     

Interstudy reproducibility of parameters of left ventricular diastolic function: a Doppler echocardiography study.

BACKGROUND AND METHODS: Interstudy reproducibility of echocardiography for the assessment of parameters of left ventricular (LV) diastolic function is disputed. Therefore, we evaluated the reproducibility of echocardiography for assessment of LV diastolic Doppler parameters in 40 consecutive patients (age range: 19-77 years), who underwent 2 echocardiographic examinations by trained sonographers following a standard protocol, in conditions in which intrapatient sources of variability were minimized. RESULTS: Interstudy reproducibility of measurements of the ratio of early (E) to late (A) peak velocities of transmitral flow (E/A) at tips of the mitral valve leaflets was found to be very good and substantially greater than analogous measurement obtained at mitral annulus level. Reproducibility of measurement of atrial filling fraction was good both at tips of mitral leaflets and at annular level. Interstudy reproducibility of isovolumic relaxation time and E-wave deceleration time was moderate. Measurements of E-wave propagation rate and the ratio of early (E') to late (A') peak velocities of diastolic excursion of lateral mitral annulus (E'/A') by Doppler tissue were found highly reproducible. Intrastudy between-reading reproducibility of Doppler parameters of LV diastolic function were overall very good, except for E-wave deceleration time. However, 80% confidence interval of absolute between-study differences of diastolic parameters were relatively large, and ranged from -0.11 to +0.19 for E/A at tips of mitral valve; -5 to +9 cm/s for E-wave propagation rate; and -0.69 to +0.19 for Doppler tissue-derived E'/A'. CONCLUSIONS: Under a standardized echocardiographic protocol and sonographers' training program, echocardiography can be a reproducible method for serial assessment of Doppler parameters of LV diastolic function, especially in cohort studies.     

组织多普勒超声评价先天性心脏病患儿左心室舒张功能

目的探讨组织多普勒超声技术评价先天性心脏病患儿左心室舒张功能的应用价值.方法对35例患儿与37例正常儿,分别于术前一周内及术后1个月应用组织多普勒成像技术测定二尖瓣环舒张期Ea、Aa峰速度、Ea/Aa比值评价左室舒张功能,并与二尖瓣口血流方法比较.结果左心型术前二尖瓣环运动频谱Ea峰下降,Aa峰升高,Ea/Aa比值减小,术后Ea下降;右心型术前Ea/Aa比值减小,术后改变不明显.结论组织多普勒超声是评价先心病患儿术前左室舒张功能的可靠方法,可鉴别二尖瓣血流E/A比值假性正常.     

定量彩色室壁动态技术评价左室局部收缩和舒张功能的实验研究

目的：检验定量彩色室壁动态技术（quantiative color kinesis,QCK)在心肌缺血和正性肌力刺激实验状态下,能否准确显示左室局部收缩和舒张功能的变化。方法：10条犬对于照状态,结扎冠状动脉左前降支以及静脉注射心先安等实验条件下,采集左室收缩末期和舒张末期CK图像,由计算机自动输出左室各节段收缩末期局部面积变化百分率（RACs）、舒张末期局部面积变化百分率（RACd),各节段的平均收缩时间（ts)和平均充盈时间（td)。结果：10条犬共获得110幅（92％）满意的左室舒张和收缩末期CK图像。（1）静息对照状态,各节段的RACs和RACd数值不同,但比较相近,侧壁基底段数值最小,前壁节段数值最在,各节段的ts和td呈连续性分布。（2）缺血状态,大部分节段RACs和RACd减小,92％的节段ts缩短,67％的节段td延长。（3）药物治疗状态：92％节段原RACs和全部节段的RACd较缺血状态增大缺血状态降至正常值以下的节段均恢复至对照水平。50％的节段ts有所延长,50％的节段td仍在继续延长。结论：QCK技术为定量评价左室避部收缩和舒张功能提供了可靠的新途径。     

Myocardial ischemia assessed by Tc99m MIBI SPECT and left ventricle regional systolic and diastolic function evaluated by tissue Doppler echocardiography

Background: Tc99m MIBI single-photon emission computed tomography (SPECT) study facilitates the evaluation of the regional myocardial perfusion and tissue Doppler echocardiography imaging facilitates the quantitative assessment of the regional systolic and diastolic function of the myocardium. The aim of the study was an assessment of the correlation between regional rest myocardial perfusion defects and regional rest systolic and diastolic myocardial velocities in patients with ischemic heart disease (IHD). Material and methods: In 40 IHD patients (33 men, 7 women) aged 43–74 years (mean 56 years) rest SPECT imaging with Tc99m MIBI and rest tissue Doppler examinations were performed. The control group consisted of 35 healthy sex and age matched pesons. The left ventricle was divided into 13 segments. The number of non-perfused segments in three myocardial perfusion regions (left anterior descending artery, circumflex artery, right coronary artery) was assessed in IHD patients. During tissue Doppler examination the maximal systolic and maximal early diastolic velocity of the myocardium in each segment were established in both examined groups. Results: The systolic and diastolic myocardial velocities were significantly lower in IHD group as compared to control group. In the IHD group statistically significant decrease of systolic and diastolic velocities in relation to the number of non-perfused segments was found. In comparing the linear regression slopes for systolic and for diastolic myocardial velocities in terms of intensification of perfusion defects, a more pronounced decrease in diastolic velocity was encountered. Conclusions: Both systolic and diastolic myocardial velocities are decreased in the myocardial regions with perfusion defects, but the reduction of the diastolic velocity is higher than the reduction of the systolic velocities. Thus our results indicate a good correlation between the intensity of perfusion abnormalities and myocardial velocities. The levels of diastolic dysfunction is more pronounced than the level of systolic dysfunction in the ischemic myocardium.     

组织多普勒成像评价左心室舒张功能障碍患者的左心室长轴收缩功能

目的 探讨左心室舒张功能障碍患者的左心室长轴收缩功能变化特征。方法 选取健康志愿者30例（Ⅰ组），左心室舒张功能障碍患者60例分为松弛性减低组（Ⅱ组）32例和假性正常化充盈组（Ⅲ组）28例，应用组织多普勒成像（TDI）模式，分别取心尖四腔心和二腔心切面，将取样容积先后置于二尖瓣环后间隔、侧壁、前壁和下壁处，记录4个位点二尖瓣环运动频谱，测量或计算舒张早期峰值速度（EM）、心房收缩期峰值速度（AM）、EM／AM比值、收缩期峰值速度（SM）、收缩期位移（DS，即收缩波时间速度积分）及收缩前期时间（PCTM，即心电图QRS波起始与收缩波起始之间期），并对3组数据进行比较分析。结果SM和DS在Ⅱ、Ⅲ组明显小于Ⅰ组（P〈0．01或P〈0．05），在各组间呈逐渐减小趋势，即Ⅰ组〉Ⅱ组〉Ⅲ组；而各组间PCTM差异无统计学意义（P〉0．05）。左心室长轴收缩功能减低发生率在Ⅱ、Ⅲ组分别是35．3％和67．2％（P〈0．01）。结论 左心室舒张功能障碍患者存在一定程度长轴收缩功能障碍，且其受损程度随着舒张功能障碍进展而加重，因而采用TDI评估左心室长轴收缩功能对全面评价患者心脏功能具有重要价值。     

超声斑点追踪技术评价左心室局部功能的进展

超声斑点追踪是近年来发展起来的一项新技术,其原理为超声成像过程中入射超声波与心肌组织之间发生散射、反射等作用而在图像上形成"斑点"回声,心肌组织中含有众多均匀分布的斑点回声,也称为自然声学标志,每个斑点的大小约为20～40像素,其位置随着心肌的运动而发生改变,通过追踪这些与心肌组织同步运动的自然声学标志可以获得心动周期中心肌组织的运动信息[1].在二维超声图像上勾画出感兴趣区心肌节段后,室壁运动追踪软件可以逐帧追踪心动周期中声学斑点的运动轨迹,通过定量分析获取心肌的运动信息[2].由于心肌运动的三维性,目前人们正在应用三维超声斑点追踪技术研究心脏各节段的运动,以更准确全面地反映心脏的运动状况.     

Automated left ventricular diastolic function evaluation from phase-contrast cardiovascular magnetic resonance and comparison with Doppler echocardiography

Background

Early detection of diastolic dysfunction is crucial for patients with incipient heart failure. Although this evaluation could be performed from phase-contrast (PC) cardiovascular magnetic resonance (CMR) data, its usefulness in clinical routine is not yet established, mainly because the interpretation of such data remains mostly based on manual post-processing. Accordingly, our goal was to develop a robust process to automatically estimate velocity and flow rate-related diastolic parameters from PC-CMR data and to test the consistency of these parameters against echocardiography as well as their ability to characterize left ventricular (LV) diastolic dysfunction.

Results

We studied 35 controls and 18 patients with severe aortic valve stenosis and preserved LV ejection fraction who had PC-CMR and Doppler echocardiography exams on the same day. PC-CMR mitral flow and myocardial velocity data were analyzed using custom software for semi-automated extraction of diastolic parameters. Inter-operator reproducibility of flow pattern segmentation and functional parameters was assessed on a sub-group of 30 subjects. The mean percentage of overlap between the transmitral flow segmentations performed by two independent operators was 99.7 ± 1.6%, resulting in a small variability (<1.96 ± 2.95%) in functional parameter measurement. For maximal myocardial longitudinal velocities, the inter-operator variability was 4.25 ± 5.89%. The MR diastolic parameters varied significantly in patients as opposed to controls (p < 0.0002). Both velocity and flow rate diastolic parameters were consistent with echocardiographic values (r > 0.71) and receiver operating characteristic (ROC) analysis revealed their ability to separate patients from controls, with sensitivity > 0.80, specificity > 0.80 and accuracy > 0.85. Slight superiority in terms of correlation with echocardiography (r = 0.81) and accuracy to detect LV abnormalities (sensitivity > 0.83, specificity > 0.91 and accuracy > 0.89) was found for the PC-CMR flow-rate related parameters.

Conclusions

A fast and reproducible technique for flow and myocardial PC-CMR data analysis was successfully used on controls and patients to extract consistent velocity-related diastolic parameters, as well as flow rate-related parameters. This technique provides a valuable addition to established CMR tools in the evaluation and the management of patients with diastolic dysfunction.     

Doppler assessment of left ventricular diastolic function: a review.

Two-dimensional echocardiography provides valuable information for the assessment of left ventricular function. Traditionally, evaluation has focused on determination of systolic performance. However, recent investigations indicate diastolic dysfunction may also contribute to symptoms of congestive heart failure in many patients despite normal systolic function. Pulsed Doppler echocardiography complements two-dimensional imaging for assessment of left ventricular filling properties that are often altered in the setting of diastolic dysfunction. The concept of diastolic function and recognition of abnormal filling patterns detected by pulsed Doppler echocardiography are reviewed.     

组织多普勒成像评价舒张性心力衰竭患者左心室长轴收缩功能

目的　检测舒张性心力衰竭 (DHF)患者左心室长轴收缩功能,探讨其临床意义。方法　选取DHF患者 30例、收缩性心力衰竭(SHF)患者 32例和正常人 34例,应用组织多普勒成像 (TDI)测定二尖瓣环收缩期峰值运动速度(SM)、位移(DS)和心电图QRS波起始至收缩波起始间期。结果　SM 在正常人、DHF和SHF分别为(7. 32±0. 65 )cm/s、( 5. 09±0. 93 )cm/s和 ( 3. 58±0. 72 )cm/s,呈现正常人 >DHF>SHF的变化 (P<0. 001),DS呈现同样逐渐减小的变化 (P<0. 001 )。左心室长轴收缩功能障碍发生率在DHF和SHF分别为81. 6% 和 95. 8% (P<0. 001)。结论　多数DHF患者存在左心室长轴收缩功能异常,TDI估测左心室长轴收缩功能在心力衰竭患者心脏功能评价中具有重要价值。     

多普勒超声心动图对急性心肌梗死患者左室舒张功能的评价

目的:采用多普勒超声心动图对急性心肌梗死(AMI)患者左室舒张功能(LVDF)的测定,判断心肌梗死面积和恢复情况,从而了解预后。方法:应用3.25MHz探头对21例AMI患者急性期和恢复期分别行二尖瓣口血流频谱(MVFP)和肺静脉血流频谱(PVFP)检测。结果:AMI患者MVFP中急性期较恢复期舒张早期流速(E峰)增加,舒张晚期流速(A峰)下降,E/A比值增大以限制性异常(左房压增高)充盈波形表现为主;有14例(66.7%)E/A>1.6,DT和IVRT短于恢复期,提示心梗面积较大,左室顺应性降低,舒张功能异常,病情严重。恢复期E峰较急性期降低,A峰则增加,E/A比值下降以松弛性异常(主动舒张迟缓)充盈波形表现为主,有18例(85.7%)E/A<0.8,说明治疗后随着心肌梗死的恢复,梗死心肌愈合,左室舒张功能逐渐改善,提示病情的好转。PVFP中急性期和恢复期S波均相似文献   

定量组织速度成像对肥厚型心肌病左心室局部心肌舒张功能的分析

目的探讨定量组织速度成像（QTVI）评价肥厚型心肌病（HCM）患者左室局部心肌舒张功能的价值。方法获标准心尖长轴切面、心尖二腔切面和心尖四腔切面，应用QTVI技术分析17例HCM患者和18例健康者左室长轴方向不同室壁节段的多普勒速度曲线，测量各节段心肌运动舒张早期峰值速度（Ve）和舒张晚期峰值速度（Va），计算左室二尖瓣环、基底段、中段水平的平均Ve、平均Va。应用脉冲多普勒技术分别测量二尖瓣口舒张早期峰值速率（E）、舒张晚期速率（A）、计算E／A。结果HCM组左室各节段Ve明显低于正常组（大部分P〈0．001），肥厚节段Va低于正常组（P〈0．05），而非肥厚节段Va两组间差异无显著性意义（P〉0．05）。两组同一水平平均Ve、Va的比较均有显著性意义（P〈0．05）。HCM组与正常组二尖瓣口E、A、E／A差异无显著性意义（P〉0．05）。结论QTVI能定量评价HCM患者左室局部心肌舒张功能。HCM患者左室长轴各节段心肌松弛性显著降低，肥厚节段的心肌顺应性受损。     

定量组织速度成像对肥厚型心肌病患者左心室局部收缩功能的研究

目的　应用定量组织速度成像 (QTVI)评价肥厚型心肌病 (HCM)患者左心室局部收缩功能。方法　应用QTVI离线分析 3 1例HCM患者和 2 0例正常对照者左室长轴和短轴方向各心肌节段的速度曲线 ,测量收缩期峰值速度 (Vs) ,计算左室后壁和室间隔各心肌节段在长轴与短轴方向速度的比值。结果　HCM组肥厚与非肥厚心肌节段的平均Vs降低 ,与对照组相比 ,绝大部分心肌节段差异有显著性意义 (P<0 .0 5) ,但HCM组肥厚与非肥厚心肌节段的平均Vs之间差异无显著性意义 (P >0 .0 5)。正常人长轴与短轴方向速度的比值均 >1,而HCM患者其比值明显降低 ,大部分比值 <1。结论　HCM患者尽管左室射血分数正常 ,但左室长轴方向各心肌节段收缩功能受损 ,损害不仅发生在肥厚的左室壁 ,非肥厚的室壁同样受到损害 ;QTVI能定量评价HCM患者左室局部收缩功能     

定量组织速度成像(QTVI)技术对左室收缩功能的研究

目的 用定量组织速度成像(QTVI)技术定量分析生理和病理(心肌缺血)状态下左室心肌收缩运动特征及其临床意义。方法 研究对象为20例心肌梗死患者和20例年龄匹配正常人。采用左室长轴切面，分别显示左心室6个室壁不同节段长轴方向的心肌同步运动曲线。测量左室收缩功能有关参数。结果 与对照组相比，心肌梗死组QTVI可敏感地定量显示出收缩波(S)平均峰值速度显著下降(P＜0.01)；持续时间缩短(P＜0．05)；等容收缩期(IVC)时限延长(P＜0．05)；表明心肌梗死病人心肌收缩功能损害。结论 QTVI技术作为定量定性评价心肌收缩功能的新方法，对无创诊断冠心病具有一定的临床应用价值。