Application of velocity vector imaging technology in vascular damage in obese children:a preliminary study

LIN Jiguang; CHEN Ji; WANG Penghui; DONG Haixia; SHOU Shixin

Abstract：Objective To explore the role of velocity vector imaging technology in assessment of vascular damage in obese children .Methods 150 children aged from 10 to 14 years old were divided into three groups according to the body mass index:group A, group B, group B, group C, respectively.The maximal radial strain (Smax), the minimum radial strain rate (SRmin) and the maximal radial strain rate ( SRmax) of the systolic phase were measured by the velocity vector imaging technique .Then, SRmax and SRmin were calculated .Meanwhile , the relationship among SRmax , SRmin and△SR with body mass index ( BMI) was analyzed.Results The body mass index in three groups ( A, B, C) was (16.4 ±1.8) kg/m2, (21.3 ±1.7) kg/m2, (26.3 ±3.0) kg/m2 , respectively, with statistically significant difference in body mass index among the three groups ( P <0.05 ) .For the comparison of Smax in each segment of carotid common artery , compared the Smax in group A vs B , P value was less than 0.05, in group A vs C, P value was less than 0.05, and in group C vs B, P value was less than 0.05.For the compari-son of SRmax of carotid common artery in group B and C , SRmax was significantly less than that in group A .SRmax in group A vs B, P value was less than 0.05, in group A vs C, P value was less than 0.05, and in group C vs B, P value was less than 0.05 .For the comparison of△SR of carotid common artery ,△SR in group was significantly less than that in group B or C .△SR in group A vs B, P value was less than 0.05, in group A vs C, P value was less than 0.05, and in group C vs B, P value was less than 0.05.△SR, Smax, and Rmax were negatively correlated to body mass index ( r =-0.739, -0.623, 0.679, P <0.05 ) .Conclusion Velocity vector imaging can be used to evaluate the vascular elasticity of obese children , thereby providing an important reference for the monitoring of cardiovascular disease .