血流向量成像技术对扩张型心肌病等容收缩期左室流场变化的研究

摘要

目的 应用超声血流向量成像(VFM)技术评价扩张性心肌病(DCM)患者等容收缩期(IVCT)左室腔内血液流场变化的特点.方法 选取DCM患者29例,正常对照组48例为观察对象,进行常规超声心动图检查,并采集IVCT左室腔内血流向量图,应用VFM软件DSA-RS1测量涡流纵径、横径及圈数；并测量左室流出道(LVOT)心尖段、中间段、基底段的向量大小,比较两组之间的差异.结果 DCM组IVCT左室腔内涡流纵径、横径、圈数均大于对照组；LVOT中间段向量值大于对照组,基底段向量值小于对照组,两组之间有统计学差异(P＜0.05),两组间心尖段向量值差异不明显.结论 VFM可用于定量评价DCM患者IVCT心腔内的血流变化.%Objective To assess the changes of left ventricular bloodflow structure within isovolumic contraction (IVCT) in patients with dilated cardiomyopathy(DCM) using vector flow mapping(VFM). Methods 29 patients with DCM and 48 healthy controls were involved. After the routine echocardiography, the left ventricular isovolumic contraction flow vector diagram were acquired, the transverse diameters. Vertical diameters,numbers of vortices and vectors of apical segment, middle segment, basal segment in left ventricular outflow tract (LVOT) were measured using VFM DSA-RS1 analysis software. The difference between DCM patients and healthy controls were compared. Results Compared with control group, the transverse diameters and vertical diameters of vortex in DCM group were bigger, number of the vortices were more, and the vectors of the middle segment were greater, while the basal vectors were less(P<0. 05). The difference of the apical segmental vectors between two groups were not significant. Conclusions VFM can quantitatively evaluate the changes of DCM intracardiac flow.