| The depth of microembolic signal direction change corresponds with vessel anatomy. | |
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MedLine Citation:
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PMID: 15644632 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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BACKGROUND: Analysis of microembolic signals (MES) suggests a change of flow direction (CFD). The aim of the present study was to relate MES direction in an amplitude plot, based on the radiofrequent (RF) signal, to the vascular anatomy as seen with transcranial color-coded duplex (TCCD). METHODS: In 5 patients undergoing heart valve surgery or aortic arch replacement, preoperatively TCCD of the distal part of the internal carotid artery and the middle and anterior cerebral arteries on the right side was performed to determine potential depths of changes in flow direction. Peroperatively, a transcranial pulsed Doppler (TCD) monitoring probe was fixed over the right temporal bone. A customized RF-based system, connected to the TCD device, captured and stored the MES. Off-line, the color-coded amplitude of the clutter-filtered RF signals was plotted as a function of time (sample interval 0.17 ms) and depth (sample interval 0.05 mm). RESULTS: A total of 313 MES were recorded in 4 patients with 66 MES (21%) showing a CFD. All MES with CFD could be assigned to maximally three different depth values, six out of eight CFD depth values as seen with the RF analysis were within 1 mm from a turn in flow direction as estimated with TCCD. CONCLUSIONS: A CFD of MES occurred at a very limited number of depths and corresponded mostly with the intracranial vascular anatomy, namely a turn of the flow direction in the intracranial vessels as observed with TCCD. |
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Authors:
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W H Mess; J M Willigers; R G A Ackerstaff; Th W O Elenbaas; A P G Hoeks |
Publication Detail:
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Type: Clinical Trial; Journal Article Date: 2005-01-11 |
Journal Detail:
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Title: Cerebrovascular diseases (Basel, Switzerland) Volume: 19 ISSN: 1015-9770 ISO Abbreviation: Cerebrovasc. Dis. Publication Date: 2005 |
Date Detail:
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Created Date: 2005-03-08 Completed Date: 2005-04-28 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9100851 Medline TA: Cerebrovasc Dis Country: Switzerland |
Other Details:
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Languages: eng Pagination: 186-91 Citation Subset: IM |
Copyright Information:
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Copyright 2005 S. Karger AG, Basel |
Affiliation:
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Department of Clinical Neurophysiology, University Hospital Maastricht, Maastricht University, AZ Maastricht, The Netherlands. WME@fknf.azm.nl |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Carotid Artery, Internal
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ultrasonography Cerebrovascular Circulation* Humans Infarction, Middle Cerebral Artery / ultrasonography* Middle Cerebral Artery / anatomy & histology*, physiology, ultrasonography* Monitoring, Intraoperative / methods Ultrasonography, Doppler, Transcranial / methods* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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