初步探讨颈动脉黏弹性与血流剪切率的相关性

Preliminary study on correlation between carotid viscoelasticity and blood flow shear rate

目的·应用超声剪切波频散(ultrasonic shear wave dispersion,USWD)技术检测颈动脉黏弹性,初步探讨其与血流剪切率的相关性。方法·招募2018年12月—2019年1月于上海交通大学附属第一人民医院普外科住院的患者45例,依据年龄中位数将其分为高年龄组(≥50岁)和低年龄组(<50岁)。采用USWD技术检测患者颈动脉的黏弹性,获取颈动脉剪切波弹性(shear wave elasticity,SWER)和剪切波频散(shear wave dispersion,SWDR),以及其血流最大剪切率(maximum shear rate,SRmax)和平均剪切率(mean shear rate,SRmean)。采用Pearson相关分析评估SWER和SWDR与血流剪切率的相关性。结果·①与低年龄组比较,高年龄组患者颈动脉SWER、SWDR、SRmax和SRmean均较低(均P<0.05)。②在所有患者中,颈动脉弹性指标SWER和黏性指标SWDR分别与SRmax和SRmean呈正相关(均P<0.05)。结论·基于USWD技术的颈动脉黏弹性指标与血流剪切率密切相关,其有望为颈动脉疾病的研究提供新的视角。

Objective·To examine the carotid viscoelasticity by using ultrasonic shear wave dispersion(USWD)technique,and to preliminarily analyze its correlation with blood flow shear rate.Methods·Forty-five patients of General Surgery Department of Shanghai General Hospital,Shanghai Jiao Tong University School of Medicine from December 2018 to January 2019 were recruited,and divided into the elder group(≥50 years old)and the younger group(<50 years old)according to the median age.The carotid viscoelasticity of the patients was examined by USWD technique and the indexes were obtained,including carotid shear wave elasticity(SWER),shear wave dispersion(SWDR),blood flow maximum shear rate(SRmax)and mean shear rate(SRmean).The correlations between SWER,SWDR and blood flow shear rate were analyzed by Pearson correlation,respectively.Results·①Compared with the younger group,the carotid artery SWER,SWDR,SRmax and SRmean of the patients in the elder group were lower(all P<0.05).②The SWER and SWDR of carotid artery of all patients were positively correlated with SRmax and SRmean,respectively(all P<0.05).Conclusion·Carotid arterial viscoelastic index based on USWD technique is closely related to the blood flow shear rate,which is expected to provide a new perspective for the study of carotid arterial diseases.