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目的应用定量组织速度成像(QTVI)评价左心室长轴方向局部心肌收缩后收缩(PSS)的特点并探讨其临床意义。方法在组织成像条件下对心肌梗死(MI)、扩张性心肌病(DCM)、肥厚性心肌病(HCM)及高血压病(HBP)患者的左心室纵向各节段的收缩后收缩进行测定,并与正常组对比分析。结果①PSS发生率:HBP组、HCM组、DCM组、MI组PSS阳性率明显高于正常对照组(P<0.05),并呈依次逐渐增高改变;②PSS分布规律:HBP组、HCM组、DCM组的PSS主要分布在前后间隔及下壁,与正常组相似,而MI组的分布则无明显规律性;③PSS持续时间:4组疾病组的PSS持续时间均明显长于正常组,二者比较差异有统计学意义(P<0.001),其中以MI组持续时间最长;④PSS峰值速度:4组疾病组的PSS峰值速度均高于正常组(P<0.05),其中以MI组峰速最高。结论左心室纵向PSS能反映心肌功能情况,其PSS的发生率越高、持续时间越长、峰值速度越大提示心肌功能损害的可能越大。
Objective To evaluate the characteristics of local myocardial contractility (PSS) in the direction of long axis of left ventricular after quantitative tissue velocity imaging (QTVI) and to explore its clinical significance. Methods The systolic contraction of the longitudinal segments of the left ventricle in patients with myocardial infarction (MI), dilated cardiomyopathy (DCM), hypertrophic cardiomyopathy (HCM) and hypertension (HBP) were measured under tissue imaging conditions. And compared with the normal group. Results ① The incidence of PSS: The positive rates of PSS in HBP group, HCM group, DCM group and MI group were significantly higher than those in normal control group (P <0.05), and gradually increased in turn; ② The distribution of PSS: HBP group, HCM group, DCM group PSS were mainly distributed in the anterior and posterior septum and the inferior wall, similar to the normal group, while the distribution of MI group had no obvious regularity; ③SPS duration: the PSS duration of the four disease groups were significantly longer than the normal group, the difference was (P <0.001), of which the MI group had the longest duration. (4) PSS peak velocity: The PSS peak velocity of the four disease groups was higher than that of the normal group (P <0.05), of which MI peaked at the highest. Conclusion Longitudinal PSS of left ventricle can reflect the function of myocardium. The higher the occurrence rate of PSS and the longer duration of PSS, the greater the peak velocity is, the greater the possibility of myocardial damage is.