脉冲多普勒对颈总动脉不同节段收缩期最大血流速度测量的影响

Effect on the Value of Systolic Peak Velocity of Common Carotid Artery with Pulse Doppler Messured at Different Distance from Bifurcation

目的：采用脉冲多普勒于颈总动脉不同节段测量一组健康人（ｎ＝２０）收缩期最大血流速度，旨在探讨不同取样位置对颈总动脉血流速度测量的影响。方法：采用７．５ＭＨｚ探头沿颈总动脉进行纵向扫查完整显示其管腔长轴，固定探头使图像稳定。于距离颈动脉球部近心端１、２、３、４、５ｃｍ处取样测量血流速度，取样容积大小和角度校正保持恒定。结果：距离颈动脉球部１、２、３、４、５ｃｍ处最大血流速度分别为６９．１±１３．８ｃｍ／ｓ、７７．２±１６．５ｃｍ／ｓ、８４．４±１６．６ｃｍ／ｓ、９１．５±２０．１ｃｍ／ｓ、７７．１±１９．３ｃｍ／ｓ（Ｐ＜０．０５）。取样位置由１ｃｍ移至４ｃｍ血流速度平均增幅７．３５ｃｍ／ｓ；取样位置由４ｃｍ移至５ｃｍ处，血流速度平均降幅为１４．１ｃｍ／ｓ。距颈动脉球３ｃｍ处血流速度变异系数最小（ＣＶ＝０．１９）。结论：取样位置由颈总动脉球部向近心端移动，血流测值并不相同。其中距颈总动脉球部３ｃｍ处血流速度测值较为恒定准确，选择此处作为颈总动脉多普勒测量标准取样位置使超声诊断颈内动脉狭窄等血管病变更为客观。

Objective:To determine if messurements of velocity vary markedly with distance from bifurcation,peak velocity of common carotid artery was messured with pulse Doppler in healthy recipients.Method:Peak velocity was messured with pulse Doppler at 1,2,3,4,5cm from bifurcation in 20 volunteers,sample volume size and velocity corrected angle remained unchanged.Results:Peak velocity obtained at 1,2,3,4,5cm from bifurcation was respectively 691±138cm/s,772±165cm/s,84.4±16.6cm/s,91.5±20.1cm/s and 77.1+19.3cm/s (P<005);velocity increased at 7.35cm/s from 1cm up to 4cm,decreased at 14.1cm/s from 4cm to 5cm.The coefficient of variation at 3cm was minimal (CV=0.19).Conclusion:The value of peak velocity varied with different distance from carotid artery bifuration,the messurement at 3cm was considered more accurate and stable.Ultrasound diagnosis of internal carotid artery stenosis and other vascular disorders would be more objective and standard if peak velocity messured at this location.