Dissipative energy loss within the left ventricle detected by vector flow mapping in dilated cardiomyopathy patients / 中华超声影像学杂志

ABSTRACT

Objective To quantitatively analyze the energy loss ( EL) of the left ventricle in dilated cardiomyopathy (DCM) by vector flow mapping (VFM). Methods Sixty-four DCM patients confirmed by clinical were enrolled and divided into three groups according to the level of left ventricular ejection fraction (LVEF)mild decreased LVEF group(group A,40% ≤ LVEF＜ 50% ),moderate decreased LVEF group ( group B,30% ≤LVEF＜40% ) and severe decreased LVEF group ( group C,LVEF＜30% ). Forty healthy volunteers were selected as control group ( group D,53% ≤ LVEF≤73% ) for physical examination. The images of apical four-chamber and three-chamber in color Doppler echocardiography were acquired and EL was analyzed in different phases in a cardiac cycle. Results There was no significant difference of the EL in isovolumic systole and isovolumic diastole between DCM groups and the control group ( P ＞ 0.05). In rapid and slow ejection period,the EL in group B and C were much lower than those in the control group ( P＜0.05). In rapid filling phase,the EL in DCM groups were much lower than that in the control group ( P＜0.05).While in slow filling period and atrial systole the EL in group C was lower than that in the control group ( P ＜0.05). Conclusions VFM provides a new perspective for the cardiac function study of DCM patients.