Williams M A, Belcaro G, Szendro G, Nicolaides A N
Irvine Laboratory for Cardiovascular Investigation and Research, St. Mary's Hospital Medical School, London.
Panminerva Med. 1992 Apr-Jun;34(2):49-54.
New criteria for the interpretation of duplex scanning waveforms were compared with those devised by Blackshear and Strandness and revealed an improved grading of internal carotid stenosis in early lesions. The ratio of peak frequency minus first zero slope frequency divided by the peak frequency (a-b/a ratio) was found to be of no value in the discrimination between normal and any grade of carotid stenosis. The new criteria depend upon the to dental presence of spectral broadening on the upstroke of systole to differentiate between normal and abnormal, spectral broadening throughout the systolic phase above the end diastolic frequency to determine greater than 15% stenosis, peak frequency greater than 4kHz to indicate greater than 50% stenosis and the absence of a Doppler signal to indicate occlusion. Comparison with two plane selective carotid angiography revealed a Kappa statistic of 0.8 +/- 0.02 using the new criteria compared with 0.65 +/- 0.03 using the established criteria of Doppler waveform analysis.
将双功扫描波形解释的新标准与布莱克希尔和斯特兰德尼斯设计的标准进行了比较，结果显示早期病变的颈内动脉狭窄分级得到了改进。发现峰值频率减去第一个零斜率频率再除以峰值频率的比值（a-b/a比值）在区分正常和任何级别的颈动脉狭窄方面没有价值。新标准取决于收缩期上升支频谱增宽的存在与否来区分正常和异常，整个收缩期高于舒张末期频率的频谱增宽来确定狭窄大于15%，峰值频率大于4kHz来表明狭窄大于50%，以及无多普勒信号来表明闭塞。与双平面选择性颈动脉血管造影的比较显示，使用新标准的卡帕统计值为0.8±0.02，而使用既定的多普勒波形分析标准时为0.65±0.03。
