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<meta name="DC.Title" content="Short-Term Changes in Cerebral Microhemodynamics after Carotid Stenting" />
<meta name="DC.Date" content="2003-09-01" />
<meta name="DC.Publisher" content="American Journal of Neuroradiology" />
<meta name="DC.Rights" content="Copyright © American Society of Neuroradiology" />
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<meta name="DC.Description" content="BACKGROUND AND PURPOSE: The cerebral hemodynamic sequelae of interventions in patients with severe internal carotid artery (ICA) stenoses are not fully understood. In this study, we sought to determine the immediate changes in cerebral perfusion characteristics, determined by MR imaging in patients who have undergone unilateral transluminal angioplasty and stent placement.

METHODS: Eleven patients with symptomatic high-grade ICA stenosis underwent MR imaging within 4 hours before and within 3 hours after carotid stent placement. First-pass gadolinium-enhanced imaging of perfusion was performed by using a gradient-recalled echo-planar technique. Localized relative cerebral blood volume (rCBV) and bolus first-moment transit time (TTFM) were calculated for different vascular territories (middle, anterior, and posterior cerebral arteries) in each hemisphere.

RESULTS: Significantly longer TTFM ( P &lt; .005) was observed in the symptomatic territory of the middle cerebral artery before intervention. After intervention, TTFM remained significantly longer in this territory ( P &lt; .05). However, the magnitude of the interhemispheric asymmetry had declined significantly (50–60% reduction; P &lt; .05). No significant differences or changes in rCBV were identified between hemispheres, between images, or in areas of unilateral leptomeningeal enhancement after intervention.

CONCLUSION: MR can demonstrate short-term partial resolution of timing asymmetry in interhemispheric perfusion after angioplasty and stent insertion for severe stenosis of the ICA." />
<meta name="DC.Contributor" content="Iain D. Wilkinson" />
<meta name="DC.Contributor" content="Paul D. Griffiths" />
<meta name="DC.Contributor" content="Nigel Hoggard" />
<meta name="DC.Contributor" content="Trevor J. Cleveland" />
<meta name="DC.Contributor" content="Peter A. Gaines" />
<meta name="DC.Contributor" content="Sumaira Macdonald" />
<meta name="DC.Contributor" content="Fiona McKevitt" />
<meta name="DC.Contributor" content="Graham S. Venables" />
<meta name="article:published_time" content="2003-09-01" />
<meta name="article:section" content="INTERVENTIONAL" />
<meta name="citation_title" content="Short-Term Changes in Cerebral Microhemodynamics after Carotid Stenting" />
<meta name="citation_abstract" lang="en" content="&lt;p&gt;&lt;i&gt;BACKGROUND AND PURPOSE:&lt;/i&gt; The cerebral hemodynamic sequelae of interventions in patients with severe internal carotid artery (ICA) stenoses are not fully understood. In this study, we sought to determine the immediate changes in cerebral perfusion characteristics, determined by MR imaging in patients who have undergone unilateral transluminal angioplasty and stent placement.&lt;/p&gt;&lt;p&gt;&lt;i&gt;METHODS:&lt;/i&gt; Eleven patients with symptomatic high-grade ICA stenosis underwent MR imaging within 4 hours before and within 3 hours after carotid stent placement. First-pass gadolinium-enhanced imaging of perfusion was performed by using a gradient-recalled echo-planar technique. Localized relative cerebral blood volume (rCBV) and bolus first-moment transit time (TT&lt;sub&gt;FM&lt;/sub&gt;) were calculated for different vascular territories (middle, anterior, and posterior cerebral arteries) in each hemisphere.&lt;/p&gt;&lt;p&gt;&lt;i&gt;RESULTS:&lt;/i&gt; Significantly longer TT&lt;sub&gt;FM&lt;/sub&gt; (&lt;i&gt;P&lt;/i&gt; &amp;lt; .005) was observed in the symptomatic territory of the middle cerebral artery before intervention. After intervention, TT&lt;sub&gt;FM&lt;/sub&gt; remained significantly longer in this territory (&lt;i&gt;P&lt;/i&gt; &amp;lt; .05). However, the magnitude of the interhemispheric asymmetry had declined significantly (50–60% reduction; &lt;i&gt;P&lt;/i&gt; &amp;lt; .05). No significant differences or changes in rCBV were identified between hemispheres, between images, or in areas of unilateral leptomeningeal enhancement after intervention.&lt;/p&gt;&lt;p&gt;&lt;i&gt;CONCLUSION:&lt;/i&gt; MR can demonstrate short-term partial resolution of timing asymmetry in interhemispheric perfusion after angioplasty and stent insertion for severe stenosis of the ICA.&lt;/p&gt;" />
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<meta name="citation_author" content="Iain D. Wilkinson" />
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<meta name="twitter:title" content="Short-Term Changes in Cerebral Microhemodynamics after Carotid Stenting" />
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<meta name="twitter:description" content="BACKGROUND AND PURPOSE: The cerebral hemodynamic sequelae of interventions in patients with severe internal carotid artery (ICA) stenoses are not fully understood. In this study, we sought to determine the immediate changes in cerebral perfusion characteristics, determined by MR imaging in patients who have undergone unilateral transluminal angioplasty and stent placement.

METHODS: Eleven patients with symptomatic high-grade ICA stenosis underwent MR imaging within 4 hours before and within 3 hours after carotid stent placement. First-pass gadolinium-enhanced imaging of perfusion was performed by using a gradient-recalled echo-planar technique. Localized relative cerebral blood volume (rCBV) and bolus first-moment transit time (TTFM) were calculated for different vascular territories (middle, anterior, and posterior cerebral arteries) in each hemisphere.

RESULTS: Significantly longer TTFM ( P &lt; .005) was observed in the symptomatic territory of the middle cerebral artery before intervention. After intervention, TTFM remained significantly longer in this territory ( P &lt; .05). However, the magnitude of the interhemispheric asymmetry had declined significantly (50–60% reduction; P &lt; .05). No significant differences or changes in rCBV were identified between hemispheres, between images, or in areas of unilateral leptomeningeal enhancement after intervention.

CONCLUSION: MR can demonstrate short-term partial resolution of timing asymmetry in interhemispheric perfusion after angioplasty and stent insertion for severe stenosis of the ICA." />
<meta name="og-title" property="og:title" content="Short-Term Changes in Cerebral Microhemodynamics after Carotid Stenting" />
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<meta name="og-description" property="og:description" content="BACKGROUND AND PURPOSE: The cerebral hemodynamic sequelae of interventions in patients with severe internal carotid artery (ICA) stenoses are not fully understood. In this study, we sought to determine the immediate changes in cerebral perfusion characteristics, determined by MR imaging in patients who have undergone unilateral transluminal angioplasty and stent placement.

METHODS: Eleven patients with symptomatic high-grade ICA stenosis underwent MR imaging within 4 hours before and within 3 hours after carotid stent placement. First-pass gadolinium-enhanced imaging of perfusion was performed by using a gradient-recalled echo-planar technique. Localized relative cerebral blood volume (rCBV) and bolus first-moment transit time (TTFM) were calculated for different vascular territories (middle, anterior, and posterior cerebral arteries) in each hemisphere.

RESULTS: Significantly longer TTFM ( P &lt; .005) was observed in the symptomatic territory of the middle cerebral artery before intervention. After intervention, TTFM remained significantly longer in this territory ( P &lt; .05). However, the magnitude of the interhemispheric asymmetry had declined significantly (50–60% reduction; P &lt; .05). No significant differences or changes in rCBV were identified between hemispheres, between images, or in areas of unilateral leptomeningeal enhancement after intervention.

CONCLUSION: MR can demonstrate short-term partial resolution of timing asymmetry in interhemispheric perfusion after angioplasty and stent insertion for severe stenosis of the ICA." />
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      <h1 class="highwire-cite-title" id="page-title">Short-Term Changes in Cerebral Microhemodynamics after Carotid Stenting</h1>  
    	<div class="highwire-cite-authors"><span  class="highwire-citation-authors"><span class="highwire-citation-author first" data-delta="0">Iain D. Wilkinson</span>, <span class="highwire-citation-author" data-delta="1">Paul D. Griffiths</span>, <span class="highwire-citation-author" data-delta="2">Nigel Hoggard</span>, <span class="highwire-citation-author" data-delta="3">Trevor J. Cleveland</span>, <span class="highwire-citation-author" data-delta="4">Peter A. Gaines</span>, <span class="highwire-citation-author" data-delta="5">Sumaira Macdonald</span>, <span class="highwire-citation-author" data-delta="6">Fiona McKevitt</span> and <span class="highwire-citation-author" data-delta="7">Graham S. Venables</span></span></div>
  
    	<div class="highwire-cite-metadata"><span  class="highwire-cite-metadata-journal highwire-cite-metadata">American Journal of Neuroradiology </span><span  class="highwire-cite-metadata-date highwire-cite-metadata">September 2003,  </span><span  class="highwire-cite-metadata-volume highwire-cite-metadata">24 </span><span  class="highwire-cite-metadata-issue highwire-cite-metadata">(8) </span><span  class="highwire-cite-metadata-pages highwire-cite-metadata">1501-1507; </span></div>
  
  
  
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<div id="hw-article-author-popups-top-node-10967--6572660279" style="display: none;"><div class="author-tooltip-0"><div class="author-tooltip-name">Iain D. 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      <div class="highwire-cite-title">Short-Term Changes in Cerebral Microhemodynamics after Carotid Stenting</div>  
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