| Cerebral vasoreactivity: a comparison of color velocity imaging quantification and stable xenon-enhanced CT. | |
| | |
MedLine Citation:
|
PMID: 15728622 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
OBJECTIVE: Compromised cerebral vasoreactivity increases the risk of stroke. In this study, we sought to determine whether extracranial arterial blood flow volume measured on color velocity imaging quantification could be predictive of cerebral vasoreactivity after the administration of acetazolamide. SUBJECTS AND METHODS: Cerebral blood flow and extracranial arterial blood flow volume of 35 patients with symptomatic carotid occlusive disease were measured before and after the administration of acetazolamide on stable xenon CT and color velocity imaging quantification, respectively. The changes in unilateral extracranial arterial blood flow volume and respective hemispheric cerebral blood flow were compared. The mean difference in the percentage of change in flow volume, the 95% limit of agreement, and Cohen's kappa coefficient were calculated. RESULTS: A total of 64 unilateral extracranial arterial blood flow volume changes were successfully compared with the changes in the ipsilateral hemispheric cerebral blood flow. The mean difference in percentage of change in flow volume between the two techniques was 4.7%, with the 95% limit of agreement ranging from -90.2% to 99.7%. Cohen's kappa coefficient was 0.41 (95% confidence interval, 0.13-0.68; p = 0.001). CONCLUSION: The performance of color velocity imaging quantification for evaluating cerebral vasoreactivity is comparable to that of transcranial Doppler sonography. Because color velocity imaging quantification is not as limited as transcranial Doppler sonography, it could be an ideal complementary tool to transcranial Doppler sonography. More studies are required to define its clinical value. |
| | |
Authors:
|
S S Y Ho; W W-M Lam; S C P Ng; M K Lam; M T V Chan; W S Poon; C Metreweli |
Publication Detail:
|
Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
|
Title: AJR. American journal of roentgenology Volume: 184 ISSN: 0361-803X ISO Abbreviation: AJR Am J Roentgenol Publication Date: 2005 Mar |
Date Detail:
|
Created Date: 2005-02-24 Completed Date: 2005-04-14 Revised Date: 2008-02-15 |
Medline Journal Info:
|
Nlm Unique ID: 7708173 Medline TA: AJR Am J Roentgenol Country: United States |
Other Details:
|
Languages: eng Pagination: 948-52 Citation Subset: AIM; IM |
Affiliation:
|
Department of Diagnostic Radiology and Organ Imaging, Prince of Wales Hospital, Ngan Shing St., Shatin, New Territories, Hong Kong. |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Aged Aged, 80 and over Blood Flow Velocity Carotid Stenosis / physiopathology*, radiography* Cerebrovascular Circulation* Color Female Humans Male Middle Aged Regional Blood Flow Tomography, X-Ray Computed* / methods Vasodilation* Xenon / diagnostic use* |
| Chemical | |
Reg. No./Substance:
|
7440-63-3/Xenon |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Diagnostic accuracy of time-resolved 2D projection MR angiography for symptomatic infrapopliteal art...
Next Document: Midbrain ataxia: an introduction to the mesencephalic locomotor region and the pedunculopontine nucl...