定量组织速度显像技术评价左心室节段性收缩功能的临床研究

Clinical study of quantitative tissue velocity imaging in evaluating segmental systolic function of left ventricle

目的 探讨定量组织速度显像(QTVI)技术定量评价室壁运动的价值。方法 应用QTVI 技术对15例健康志愿者(A组)和15例心肌梗死患者(B组)采集心尖四腔、心尖二腔和心尖长轴观组织速 度图像。将室间隔、侧壁、前壁、下壁、前间隔和后壁分别按照基底段、中段和心尖段划分为18个节段,测 量各节段的收缩期峰值速度(Vp)、收缩期峰值位移(D)、收缩期最大应变率(SR)和收缩期最大应变(S)4 项指标。结果 B组运动异常节段中,18个节段中共有16个节段的Vp测值,15个节段的D测值,17个节 段的SR测值,16个节段的S测值明显低于A组对应节段的测值,差异具有显著性意义(P<0.01或 0.05)。结论 QTVI技术可准确识别运动异常节段,在定量评价节段性室壁收缩功能中具有重要价值。

Objective To explore the value of quantitative tissue velocity imaging (QTVI) in quantitatively evaluating segmental systolic function of left ventricle. Methods Fifteen healthy volunteers(group A) and fifteen myocardial infarction patients (group B) were studied at apical four-chamber view, two-chamber view and apical longitudinal view using QTVI. Septal, lateral, anterior, inferior, ante-septal and posterior walls were divided into basal, middle and apical segments respectively, in total 18 segments. The systolic peak velocity (Vp), systolic peak displacement (D), systolic peak strain rate (SR) and strain (S) were measured respectively for each segment of both groups. Results For abnormal wall motion segments in group B, the value of Vp showed significant lower in 16(16/18) segments, D in 15(15/18) segments, SR in 17(17/18) segments and S in 16(16/18) segments than those in the corresponding segments of group A (all P< 0.01 or 0.05). Conclusions QTVI can differentiate accurately abnormal from normal motion segments and play an important role in the quantitative assessment of segmental systolic function of left ventricle.