BACKGROUND AND PURPOSE Retrospective studies have found a close correlation between an impaired cerebrovascular reserve capacity and the incidence of hemodynamic stroke. The present study evaluates this relation prospectively. METHODS We measured the CO2 reactivity in 85 patients with internal carotid artery occlusions by transcranial Doppler sonography (Doppler CO2 test). All patients were p...

To evaluate the accuracy of a pulsed multigated Doppler system, 128 carotid arteries were examined. The spectral broadening index was calculated from the power spectrum of a small sample volume located in the center of the stream according to the flow profile and was related to the degree of stenosis as determined by contrast angiography. Even minor wall irregularities seen on the angiogram wer...

Kinking and coiling of the arteries are rare morphological alterations of the internal carotid artery (ICA) described as the most frequent sole cause of cerebrovascular insufficiency (CI), or as a combined cause together with carotid atherosclerosis. Although incidence of kinking and coiling of the ICA has been estimated to range from 10% to 16% in the general population, only 4% to 16% of thes...

TA is a large vessel vasculitis involving mainly the aorta and its primary branches resulting in segmental stenosis, occlusion or aneurysms [1]. Angiography gold standard for diagnosing but may miss wall changes early stages of disease

Anecdotal reports have described a false-positive "jet effect" or velocity increase in the carotid artery contralateral to an artery with significant stenosis or occlusion when using duplex Doppler sonography. In this study, the frequency, significance, and possible reasons for this finding were evaluated by a retrospective comparison of duplex sonography and angiography. Twenty-three patients ...

OBJECTIVES Carotid endarterectomy reduces the risk of stroke in symptomatic patients with severe ipsilateral carotid stenosis. Symptomatic patients should therefore undergo carotid Doppler imaging, but in some centres access to imaging is limited. It was therefore investigated whether simple clinical features alone or in combination could be used to identify patients with severe carotid stenosi...

BACKGROUND AND PURPOSE We compared relative changes in middle cerebral artery velocity and internal carotid artery flow during autoregulation testing to test the validity of using transcranial Doppler recordings of middle cerebral artery velocity to evaluate cerebral autoregulation in humans. METHODS Seven human volunteers had dynamic autoregulation tested during surgical procedures that incl...