Abstract
This study was performed to quantify the volumetric impact of extracranial arteriosclerotic lesions. We investigated patients with different degrees of carotid stenosis as defined by conventional velocity-based duplex criteria and different patterns of collateralization. We studied the volume flow rate (color duplex M-mode device) in 37 patients with symmetrical internal carotid artery (ICA) plaques (<50% stenosis) and compared these data to 43 patients with a unilateral 50–74% stenosis, 75–99% stenosis (n = 73) and occlusion of the ICA (n = 37). A 75–99% stenosis caused an ipsilateral flow reduction of 36% with a wide interindividual variability, and an occlusion of 51%. Collateralization via the ophthalmic artery only caused a nonsignificant ipsilateral volume flow increase, whereas the contralateral volume flow was significantly higher in patients with a patent anterior communicating artery. The increase was more pronounced in patients with an occluded vessel. Our data demonstrate a wide diversity of the hemodynamic impact of carotid stenosis as defined by ‘classical’ Doppler criteria. Collateral flow reflects a dynamic quantitative process.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
