Left ventricular energy loss during systole in patients with hypertension detected by ultrasonic vector flow mapping / 中华超声影像学杂志

ABSTRACT

Objective To evaluate the value of left ventricular energy loss (EL) in the systolic left ventricular hemodynamic changes in hypertensive patients by ultrasonic flow vector imaging (VFM). Methods Ninty-eight hypertensive patients were divided into non left ventricular hypertrophy group (NLVH group) and left ventricular hypertrophy group (LVH group) according to the left ventricular mass index(LVMI).Thirty-one healthy adults were erolled as control group.The average total energy loss (EL-T),basal energy loss (EL-B),middle energy loss (EL-M) and apical energy loss (EL-A) of each isovolumic contraction phase,fast ejection phase and slow ejection phase were obtained by VFM,the difference among the three groups were compared.Results ①EL-T and EL-B in isovolumic phase,rapid ejection phase and slow ejection phase in NLVH group were higher than those in control group ( P <0.05 or P <0.01);EL-T,EL-B,EL-M and EL-A in isovolumic phase,rapid ejection phase and slow ejection phase in LVH group were all higher than those in control group ( P <0.05 or P <0.01);EL-M in isovolumic phase and rapid ejection phase,EL-T,EL-B,EL-M and EL-A in slow ejection phase in LVH group were higher than those in the NLVH group ( P <0.05 or P <0.01).② There was a positive correlation between EL-T and LVMI (r=0.311, P < 0.01),EL-B and LVMI ( r = 0.219, P < 0.05),EL-M and LVMI( r = 0.207, P <0.05),EL-T and LVEF( r = 0.340, P < 0.05),EL-B and LVEF( r = 0.367, P < 0.01) in isovolumic contraction phase.There was a positive correlation between EL-B and LVEF( r = 0.359, P < 0.01) in rapid ejection phase.There was a positive relation between EL-B and LVEF( r =0.352,P <0.05) in slow ejection phase.Conclusions The EL of systolic peroid in hypertensive patients increased,which suggests that the left ventricular hemodynamic changes abnormally,VFM can accurately evaluate the changes of hemodynamic during systole.