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目的:应用速度向量成像技术(VVI)比较静息状态下相同节段的正常心肌、梗死心肌及非梗死心肌纵向和径向的运动特点,评价VVI技术对冠心病心肌梗死患者节段心肌收缩功能的临床应用价值。方法:选取健康志愿者30例和心肌梗死患者30例,分为正常组与心肌梗死组。选取心尖四腔、心尖二腔、心尖左室长轴;二尖瓣水平、乳头肌水平及近心尖部水平左室短轴切面,定量分析左室前间隔、前壁、侧壁、下壁、后壁及后间隔的径向运动,以及纵向的基底段、中间段及心尖段三个分段中梗死节段、非梗死节段及正常节段的心肌速度(Vs),应变(S),应变率(SR)。结果:正常人左心室各室壁基底段、中间段和心尖段速度依次递减;应变、应变率差异无统计学意义。左心室各室壁二尖瓣水平切面、乳头肌水平切面、近心尖部水平切面径向速度、应变、应变率差异无统计学意义。心肌梗死组梗死节段VVI测值均降低,与正常组比较差异具有显著性意义。结论:VVI技术可以作为无创的心肌梗死诊断指标,有助于确定或排除冠心病心肌梗死诊断。
OBJECTIVE: To compare longitudinal and radial movement characteristics of normal, myocardial infarction and non-infarcted myocardium in the same segment under resting condition by using velocity vector imaging (VVI) and to evaluate the effect of VVI on segmental myocardial contractile function in patients with coronary heart disease The clinical value. Methods: 30 healthy volunteers and 30 myocardial infarction patients were selected and divided into normal group and myocardial infarction group. The apical four-chamber, apical two-chamber, apical left ventricular long axis, the mitral valve level, the level of the papillary muscle and the apical left ventricular short axis were selected to quantitatively analyze the left ventricular anterior septum, anterior wall, lateral wall, inferior wall, Radial motion of the posterior wall and posterior septum, as well as myocardial velocity (Vs) and strain (S) in the infarct segment, non-infarct segment and normal segment in the three basal segments, Strain rate (SR). Results: The velocity of basal segment, middle segment and apical segment of each ventricular wall of normal people decreased in sequence. There was no significant difference between strain and strain rate. There was no significant difference in horizontal plane of mitral valve, horizontal section of papillary muscle, radial velocity, strain and strain rate of horizontal apical section of left ventricle. The myocardial infarction segment VVI measured values were reduced, compared with the normal group had significant significance. Conclusion: VVI can be used as a noninvasive diagnostic indicator of myocardial infarction, which can be helpful to confirm or exclude the diagnosis of myocardial infarction in patients with coronary heart disease.