Hemodynamic analysis of dynamic vertebrobasilar insufficiency by color duplex sonography -Wave form analysis of extracranial vertebral artery-

为探讨椎动脉的正常形态，对67例健康青年志愿者进行了椎动脉彩色双功超声检查。并对29例疑似血流动力性椎-基底动脉供血不足(血流动力学VBI)的无耳鼻咽喉科疾病患者按正常值进行评估。最大血流速度(Vmax)、最小血流速度(Vmin)、平均血流速度(Vean)、加速率(Acc)、搏动指数(PI)、阻力指数(RI)、管腔面积、血流量：(1)颅外椎动脉：C3、C4、C5、C6。C5水平似乎是获得彩色血流图和脉冲多普勒波形的最合适位置。(2)男女各2例，均有一侧(右侧1例，左侧3例)出现异常波形。这些似乎是正常的变种。正常变异率(4/67)明显高于左右两侧无差异的颈动脉。(3)正常志愿者分为6组。侧显性(RT.流量/全缺陷体积：男22例，女13例；对称性(0.45~0.55)男7例，女8例；侧优势(&gt；0.55)7男6女。根据分布情况。左右两侧血流阻力指数差异有统计学意义(4)左右侧优势组双侧阻力指数差异有统计学意义。(5)PI和RI是评价椎动脉波形改变的合适指标。(6)29例患者中6例诊断为动态VBI。当旋转头部或改变位置时，其PI、RI发生变化

To investigate the normal profile of vertebral artery, color duplex sonography was performed in 67 young normal volunteer. And 29 hemodynamic vertebrobasilar insufficiency (hemodynamic VBI) suspected patients without otorhinolaryngologic disorder were assessed by those normal value. The following parameters were quantified that maximum flow velocity(Vmax), minimum flow velocity(Vmin), mean flow velocity(Vmean), Accelerate rate(Acc), PI(pulsatory index), RI(resistance index), luminal area, flow volume(1) Extracranial vertebral arteries were able to be observed from the basis to C2 level, but 4 levels ; C3, C4、C5、C6 were quntitative. C5 level was seemed to be most suitable position to gain the color flow mapping and Pulse Doppler wave form(2)Abnormal wave form were observed at one side(1 right side and 3 left side) in each 2 cases of male and female. These seem to be the normal variants. The rate of normal variants (4/67) seems to be fairly higher as compared with carotid artery which has few differences in right and left side(3) Normal volunteer were classified into 6 group : It. Side dominant (rt. flow volume/all flaw volume < 0.45) 22 male and 13 female ; symmetric (0.45〜0.55) 7 male and 8 female ; rt. Side dominant (>0.55) 7 male and 6 female. According to distribution. of flow volume in right and left side(4)There were significant difference between bilateral RI of male and female in It, side dominant group. And(5)PI and RI were thought to be suitable indicator for evaluating the changes in wave form of vertebral artery(6)We diagnosed 6 of 29 patients as dynamic VBI. Their PI,RI were changed at rotating the head or changing the position