Evaluation of spatial and temporal relationship between left ventricular volume and longitudinal strain in healthy subjects by 2D speckle-tracking echocardiography / 中华超声影像学杂志

ABSTRACT

Objective To evaluate the coupling relationship between segmental longitudinal strain and left ventricular volume at different phases of the cardiac cycle by two dimensional speckle tracking imaging. Methods 2D grey scale images of 41 healthy adults were acquired,and time curve of left ventricular volume (LVV),segmental longitudinal strain(LS)and segmental longitudinal strain rate(LSr)were outputed by analysis software.The correlations between LVV and LS or LSr in isovolumic relaxation time(IVRT),the rapid filling time(RFT),the atrial filling time(AFT)and the ejection time(ET)were analyzed respectively. Results ①IVRTLS in basal segment,middle segment,apical segment of interventricular septum,in apical segment,basal segment of the lateral wall,and in middle segment of inferior wall were low-moderate negatively correlated with LVV;only LSr in middle segment of anterior wall was negatively correlated with LVV(P<0.05).② RFTLS in middle segment,apical segment of interventricular septum,in apical segment of the lateral wall were negatively correlated with LVV;LSr in basal segment,middle segment, apical segment of interventricular septum,in apical segment,middle segment,basal segment of lateral wall, in middle segment,basal segment of inferior wall were low-moderate negatively correlated with LVV(P <0.05).③AFTLS in basal segment of inferior wall,in apical segment,basal segment of the anterior wall were low negatively correlated wtih LVV(P <0.05).④ETLS in basal segment,middle segment,apical segment of interventricular septum,in apical segment,basal segment of the lateral wall were low negatively correlated with LVV(P <0.05);only LSr in apical segment of lateral wall was negatively correlated with LVV(P<0.05).Conclusions LS or LSr in special segments of interventricular septum,lateral wall, anterior wall and posterior wall are actively participate in the volume change of the left ventricle in healthy adults,specific myocardial segments of left ventricular wall are involved in left ventricular volume changes.