A Preliminary Study On The Simple Obese Children Carotid Artery Elasticity Velocity Vector Imaging

Velocity vector imaging (VVI) technique can accurately track the spot signal changes of spatio-temporal trajectory at real-time by the the principle of ultrasonic imaging pixel tracing. These pixels distribut within the tissue and synchronously move, determination can reflect tissue motion mechanical characteristics and parameters, it can reflect the tissue motion mechanical characteristics and measure the parameters. So the technology is a convenient, fast, noninvasive ultrasonic testing method.the technology can be a comprehensive and quantitative assessment of myocardial and arterial wall deformation characteristics, it has become one of the important methods of examination of cardiovascular disease. Hitherto the study of the correlation between arterial elasticity and body mass of children by the technique has not been reported at domestic.Part1: Study on quantitative evaluation of carotid elasticity in normal children by velocity vector imaging techniqueObjective To discuss the application of quantitative evaluation of carotid elasticity in normal children by velocity vector imaging technique.Methods The researchers selected46healthy students from a primary school as the object of study, include25males and21females, ages were7-12years old, mean age (9.7±1.83).The maximum radial strain rate using velocity vector imaging technique for measuring the carotid artery systolic radial strain and time to peak systolic radial strain rate, the maximum and the peak time, diastolic, and systolic and diastolic strain rate calculated maximum difference.Results The parameters of carotid artery elastic between6side walls of short axis(Smax, SRmax, SR and Smax,ΔSRmax systolic peak time) has no obvious statistical difference (P>0.05).Smax,SRmax,ΔSR have no obvious statistical difference between males and females(P>0.05).Smax, SRmax, ΔSR have no obvious statistical difference between different measurers(P>0.05).Smax, SRmax, ΔSR and SRmax peak time have no obvious statistical difference between each wall sections(P>0.05).Conclusions The technique of velocity vector imaging can quantitatively evaluate the carotid elasticity and movement mechanics characteristic in normal children, It provides the basis for further study on the change of carotid artery elasticity in children with various pathogenic factors. Part2: Preliminary Study on Carotid Artery Elasticity in Simple Obese Children by Velocity Vector Imaging TechniqueObjective To discuss the value of study on carotid atery elasticity in simple obese children by velocity vector imaging technique.Methods The researchers selected46students in grade1～6from a primary school as subjects for the present study,(25males,21females, ages7-12years, mean ages (9.7±1.83)years.The cases of normal children were20,overweight children were12, obese children were14.Quantitatively measured carotid artery by velocity vector imaging measurement, including the maximum radial systolic strain (Smax)and time to peak velocity,the maximum radial systolic strain rate (SRmax), the maximum radial diastolic strain rate (SRmin), then calculated the difference between the systolic and diastolic peak strain rate (ΔSR).Results There were significant differences of BMI and Smax、SRmax、ΔSR between overweight, obese group and normal control group(P<0.05);negative correlativity between overweight, obese and normal control group(r=-0.617--0.742). There was no significant differences of Smax、SRmax、ΔSR and systolic time to peak between the carotid arteries of6side walls in different group.Conclusions Velocity vector imaging technique can quantitativly evaluate the vascular elasticity reducing of overweight,obesity children, elastic parameters can be used as one of early monitoring index of cardiovascular disease among the obese and overweight children.