Lee T H, Ryu S J, Chen S T, Chan J L
Department of Neurology, Chang Gung Memorial Hospital, Taipei, Taiwan.
Angiology. 1993 Aug;44(8):607-13. doi: 10.1177/000331979304400803.
Five cases of unilateral intracranial internal carotid artery (ICA) occlusion received both carotid angiographic and ultrasonographic studies. The Doppler examination showed that the resistive index (RI) of the common carotid artery (CCA) and ICA was higher but the peak systolic velocity was lower on the diseased side as compared with the normal side. Absence of the diastolic phase was found in the CCA flow in 2 cases and in the ICA flow in 3 cases on the diseased side. The mean CCA flow volume on the diseased side (271 +/- 82 mL/min) was half or less than that on the normal side (680 +/- 86 mL/min) (P < 0.01). The flow volume of the diseased ICA (49 +/- 20 mL/min) was markedly lower than that of the normal side (344 +/- 49 mL/min) (P < 0.01) and was also less than that of the ipsilateral external carotid artery (ECA) (129 +/- 43 mL/min). The Doppler ophthalmic artery flow all showed a forward direction. The authors propose that the following extracranial carotid ultrasonographic findings may be helpful in the prediction of intracranial carotid artery occlusion: (1) diminished frequencies, increased RI, and a more than 50% reduction of flow volume in the CCA as compared with the opposite side; (2) diminished frequencies to loss of the diastolic phase, a more than 50% reduction of the flow volume, and reversed ICA/ECA flow volume in the ICA as compared with the opposite side; and (3) a forward Doppler ophthalmic artery flow.
对5例单侧颅内颈内动脉（ICA）闭塞患者进行了颈动脉血管造影和超声检查。多普勒检查显示，患侧颈总动脉（CCA）和ICA的阻力指数（RI）较高，但收缩期峰值流速低于正常侧。患侧2例CCA血流和3例ICA血流出现舒张期血流信号消失。患侧CCA平均血流量（271±82 mL/min）为正常侧（680±86 mL/min）的一半或更少（P<0.01）。患侧ICA血流量（49±20 mL/min）明显低于正常侧（344±49 mL/min）（P<0.01），也低于同侧颈外动脉（ECA）（129±43 mL/min）。多普勒眼动脉血流均呈正向。作者提出，以下颅外颈动脉超声检查结果可能有助于预测颅内颈动脉闭塞：（1）与对侧相比，CCA频率降低、RI增加且血流量减少超过50%；（2）与对侧相比，ICA频率降低至舒张期血流信号消失、血流量减少超过50%且ICA/ECA血流量逆转；（3）多普勒眼动脉血流正向。
