Cerebral blood stream changes of internal carotid stenosis or occlusion in senile patients

Objective To analyze cerebral blood stream changes of internal carotid stenosis or occlusion in senile patients. Methods The extent of severe stenosis or occlusion of internal carotid artery, intracranial blood stream, patterns of collateral circulation, systole velocity(Vs) and pulsation index(PI) in stenosis side of MCA were detected in 34 cases by color duplex flow imaging(CDFI) and transcranial Doppler(TCD), and compared with 20 normal cases. Results 16 cases of severe stenosis and 18 cases of occlusion in single internal carotid were detected by CDFI. Surveying diameters in internal carotid were 0.4~1.7 mm. Patterns of collateral circulation were detected by TCD. Anterior communicating artery was 85%. Posterior communicating artery was 55%. Ophthasmoic artery was 33%. The Vs and PI in the stenosis side and healthy side of MCA were significantly different(P 0.001). Conclusion Intracranial blood flow was decreased and collateral circulation was changed after internal carotid artery stenosis or occlusion. It is suggested that collateral circulation is significant to treatment and prognosis.