Johnston K W, Kassam M, Cobbold R S
Ultrasound Med Biol. 1983 May-Jun;9(3):271-81. doi: 10.1016/0301-5629(83)90061-3.
One hundred and seventy-five aortofemoral segments were studied in order to determine the role of CW Doppler ultrasound combined with real-time spectral analysis in the assessment of aortoiliac disease. The pulsatility index (PI), determined from the maximum velocity waveform, was compared to the systolic pressure difference between the aorta and common-femoral artery as measured at the time of angiography. Receiver operating characteristic curves were constructed and the optimum sensitivities and specificities measured. Results show that if a PI(max) of 5.5 is taken as the threshold level, then the PI is 95% sensitive and specific in detecting hemodynamically significant aortoiliac disease that corresponds to a resting aortofemoral pressure difference of 10 mm Hg or greater. We also carefully examine those technical aspects of Doppler recording and analysis that influence the accuracy of PI measurements.
为了确定连续波多普勒超声结合实时频谱分析在评估主髂动脉疾病中的作用，对175条主股动脉段进行了研究。从最大速度波形确定的搏动指数（PI）与血管造影时测量的主动脉和股总动脉之间的收缩压差进行比较。构建了受试者工作特征曲线，并测量了最佳敏感性和特异性。结果表明，如果将PI（最大值）5.5作为阈值水平，那么PI在检测与静息主股动脉压差10 mmHg或更大相对应的血流动力学显著的主髂动脉疾病时，敏感性和特异性均为95%。我们还仔细研究了影响PI测量准确性的多普勒记录和分析的技术方面。
