Nordal H J, Dullerud R, Amthor K F
Department of Neurology, Ullevål University Hospital, Oslo, Norway.
Eur Neurol. 1993;33(1):38-43. doi: 10.1159/000116898.
The relationship between blood velocity and residual lumen diameter at the origin of 100 internal carotid arteries was studied. The diameter was measured by angiography and blood velocity by relatively simple Doppler ultrasound equipment. A scatter diagram between maximal velocity and diameter was used to construct a table on the sensitivity and specificity of various cutoff values for maximal velocity to diagnose stenoses of different degrees. A maximal velocity > or = 0.8 m/s had a sensitivity of 87% and a specificity of 93% to diagnose stenoses with a diameter < or = 3 mm (i.e. more than 50% diameter reduction). Thus, simple recording of maximal velocity can be used as a reliable screening method to detect patients with high- and medium-grade stenosis. Analysis of the spectral spreading of velocities across the lumen of a stenosis, or estimation of percent stenosis from the velocity in a stenosis and that in a poststenotic segment, were in our hands less useful for this purpose. None of the methods were good to detect or exclude the presence of low-grade stenosis.
研究了100条颈内动脉起始处的血流速度与残余管腔直径之间的关系。通过血管造影测量直径，使用相对简单的多普勒超声设备测量血流速度。利用最大速度与直径之间的散点图构建了一个表格，列出了不同最大速度临界值对诊断不同程度狭窄的敏感性和特异性。最大速度≥0.8m/s诊断直径≤3mm（即直径减少超过50%）狭窄的敏感性为87%，特异性为93%。因此，简单记录最大速度可作为检测中、重度狭窄患者的可靠筛查方法。对狭窄管腔内速度频谱展布的分析，或根据狭窄处及狭窄后段的速度估计狭窄百分比，在我们手中用于此目的的作用较小。这些方法均不适用于检测或排除轻度狭窄的存在。
