RESUMO
Objective@#To detect the viscoelasticity of carotid artery in healthy volunteers using ultrasonic shear wave dispersion (SWD) technique, and explore the feasibility and influencing factors for SWD parameters.@*Methods@#Forty-five healthy volunteers were recruited and divided into elder group (≥50 years old) and younger group (<50 years old) according to the age. The carotid arteries were examined by SWD at systole, axial elastic modulus (SWER) and viscous index (SWDR) were obtained. The pulse wave velocity (PWV), a carotid artery circumferential elastic parameter was obtained and considered as the reference indicator. The difference of SWER, SWDR and PWV were compared between two groups; and the correlation between them were analyzed by Pearson analysis, respectively.@*Results@#①Compared with the younger group, the carotid PWV increased, while SWER and SWDR decreased in the elder group(all P<0.05). ②In all subjects, SWER was negatively correlated with PWV (r=-0.256, P<0.05). In the elder group, SWER was negatively correlated with systolic blood pressure (r=-0.357, P<0.05), and SWDR was negatively correlated with PWV (r=-0.393, P<0.05). In the younger group, SWDR was positively correlated with systolic blood pressure (r=0.366, P<0.05).@*Conclusions@#Compared with the elder group, the carotid viscoelasticity was higher in young people, and it is correlated with PWV. SWD can evaluate carotid viscoelasticity, and contribute to better understanding of its tissue characteristics.
RESUMO
Objective To detect the viscoelasticity of carotid artery in healthy volunteers using ultrasonic shear wave dispersion ( SWD ) technique ,and explore the feasibility and influencing factors for SWD parameters . Methods Forty‐five healthy volunteers were recruited and divided into elder group ( ≥50 years old) and younger group ( ＜50 years old) according to the age . T he carotid arteries were examined by SWD at systole ,axial elastic modulus ( SWER ) and viscous index ( SWDR ) were obtained . T he pulse wave velocity ( PWV ) ,a carotid artery circumferential elastic parameter was obtained and considered as the reference indicator . T he difference of SWE R ,SWDR and PWV were compared between two groups ; and the correlation between them were analyzed by Pearson analysis ,respectively . Results ① Compared with the younger group ,the carotid PWV increased ,w hile SWE R and SWDR decreased in the elder group ( all P ＜0 .05) . ②In all subjects ,SWER was negatively correlated with PWV ( r ＝ －0 .256 , P ＜ 0 .05 ) . In the elder group ,SWER was negatively correlated with systolic blood pressure ( r ＝ －0 .357 , P ＜ 0 .05 ) ,and SWDR was negatively correlated with PWV ( r ＝ －0 .393 , P ＜0 .05 ) . In the younger group ,SWDR was positively correlated with systolic blood pressure ( r ＝0 .366 , P ＜0 .05) . Conclusions Compared with the elder group ,the carotid viscoelasticity was higher in young people ,and it is correlated with PWV . SWD can evaluate carotid viscoelasticity ,and contribute to better understanding of its tissue characteristics .