| Transcranial color Doppler flow imaging in detecting severe stenosis of the intracranial vertebral artery: a prospective study. | |
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MedLine Citation:
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PMID: 16377476 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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OBJECTIVE: The aims of this prospective study were to investigate the manifestations of the hemodynamics and morphology of a normal intracranial vertebral artery (VA) and diffusely severe or localized critical vertebral artery stenosis (VAS) on transcranial color Doppler flow imaging (TCDFI) and to discuss the criteria of TCDFI in detecting severe VAS. METHODS: There were 30 patients suspected of having an intracranial VAS in a patient group and 30 healthy volunteers in a control group. All the patients underwent both TCDFI and digital subtraction angiography (DSA). The intracranial VA was imaged through the suboccipital window by TCDFI. The size and tortuousness of the vessels were observed. The hemodynamics of those vessels were measured by means of peak systolic velocity (PSV) and pulsatility index (PI). RESULTS: In the control group, the VA junction with basilar artery appeared as Y shaped and filled with well-distributed blue coded on color imaging, which showed flow below the baseline with fast early systolic acceleration, and normal PSV ranged from 0.42 to 0.80 m/s on pulse wave Doppler. In the patients with diffusely severe VAS (>70% lumen reduction, the length of plaque >1 cm or multiple plaques) or localized critical VAS (>90% lumen reduction) diagnosed by TCDFI and confirmed with DSA, a narrowed and tortuous VA was demonstrated with minimal flow on color Doppler imaging and decreased 50% of normal PSV and PSV <0.30 m/s accompanied by slow early systolic acceleration on Doppler spectrum. There was a significant difference (P<.05 or P<.01) in the hemodynamic parameters (PSV and PI) between patients with severe VAS and healthy subjects. CONCLUSION: TCDFI is a useful noninvasive tool in assessing the hemodynamics of intracranial arteries. The sensitivity was 90.9% and the specificity was 75.0% by using PSV <0.30 m/s and 50% reduction of normal PSV as low cutoff criteria in the diagnosis of diffusely severe or localized critical VAS with TCDFI. |
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Authors:
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Jia-wei Tian; Li-tao Sun; Zhen-wei Zhao; Jing Gao |
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Publication Detail:
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Type: Evaluation Studies; Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Clinical imaging Volume: 30 ISSN: 0899-7071 ISO Abbreviation: Clin Imaging Publication Date: 2006 Jan-Feb |
Date Detail:
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Created Date: 2005-12-26 Completed Date: 2006-05-11 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 8911831 Medline TA: Clin Imaging Country: United States |
Other Details:
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Languages: eng Pagination: 1-5 Citation Subset: IM |
Affiliation:
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Department of Ultrasound, Second Affiliated Hospital, Harbin Medical University, Harbin 150086, PR China. jwtian2004@yahoo.com.cn |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Aged Angiography, Digital Subtraction Blood Flow Velocity Female Humans Male Middle Aged Prospective Studies Sensitivity and Specificity Ultrasonography, Doppler, Transcranial Vertebral Artery / radiography, ultrasonography* Vertebrobasilar Insufficiency / physiopathology, ultrasonography* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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