速度向量成像技术评价妊娠高血压综合征颈总动脉长轴管壁运动的初步研究

目的 应用速度向量成像技术(VVI)评估妊娠高血压综合征(妊高征)患者颈总动脉管壁径向运动速度峰值、应变及应变率的特点,初步探讨该技术在评估妊高征血管机械特性方面的临床应用价值.方法 28例妊高征患者(妊高征组),34例正常妊娠者(对照组),应用VVI技术测量分析右侧颈总动脉长轴切面前壁及后壁的收缩期径向运动速度峰值、应变及应变率.结果 妊高征组颈总动脉前壁及后壁收缩期径向运动速度峰值较正常妊娠组明显减低[(0.22±0.09)cm/s对(0.29±0.09)cm/s,P<0.01;(0.24±0.10)cm/s对(0.34±0.13)cm/s,P<0.01],其前、后壁的应变及应变率也较正常妊娠组明显降低r应变:(8.50±4.92)%对(12.2±6.21)%,P<0.01;(10.11土5.02)%对(14.21±6.48)%,P<0.05;应变率:(1.62±1.14)s~(-1)对(2.24±1.13)s~(-1),P<0.05;(1.91±0.99)s~(-1)对(2.45±1.02)s~(-1),P<0.05].结论 VVI技术可用于评价妊高征患者血管壁力学特性.

Evaluation of common carotid arterial mechanics in pregnancy-induced hypertension by velocity vector imaging

Objective To evaluate the longitudinal velocity,strain and strain rate of the common carotid artery(CCA)in pregnancy-induced hypertension(PIH)patients using velocity vector imaging (VVI).Methods Twenty-eight patients with PIH and 34 normal pregnant women as the control group were studied.The maximaI velocity(Vs),strain(Smax)and strain rate(SRmax)of the right CCA anterior and posterior wall in systole were measured.Results The systolic longitudinal Vs of both the anterior and posterior wall of the CCA were significantly decreased in PIH group compared with those in the control group[(0.22±0.09)cm/s vs(0.29±0.09)cm/s,P<0.01;(0.24±0.10)cm/s vs(0.34±0.13)cm/s,P<0.01].The systolic longitudinal Smax and SRmax of the CCA anterior and posterior wall were also notably decreased in PIH group compared with those in the control group[Smax:(8.50±4.92)%vs (12.2±6.21)%,P<0.01;(10.11±5.02)%vs(14.21±6.48)%,P<0.05.SRmax:(1.62±1.14)s~(-1)vs(2.24±1.13)s~(-1),P<0.05;(1.91±0.99)s~(-1)vs(2.45±0.97)s~(-1),P<0.05].Conclusions VVI has potential usefulness for assessing vascular mechanics.