Assessment of intracranial circle after carotid endarterectomy.

To evaluate haemodynamic effects of carotid endarterectomy on cerebral circulation, transcranial Doppler sonography was performed on 69 patients operated for unilateral carotid stenosis greater than 70%. Pre- and post-operative Vm and PI on bilateral middle-cerebral arteries, Vm PI and flow direction on ipsilateral anterior cerebral artery and Vm on basilar artery were evaluated. All patients presented more or less evident preoperative haemodynamic alterations of cerebral circulation and after surgery showed a normal distribution of cerebral blood supply.