Detection of clinically silent infarcts after carotid endarterectomy by use of diffusion-weighted imaging
| Autor: | R J, Feiwell, L, Besmertis, R, Sarkar, D A, Saloner, J H, Rapp |
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| Rok vydání: | 2001 |
| Předmět: |
Cerebral Cortex
Male Neurologic Examination Endarterectomy Carotid Middle Cerebral Artery Ultrasonography Doppler Transcranial Brain Infarction Middle Cerebral Artery Cerebral Infarction Middle Aged Image Enhancement Magnetic Resonance Imaging Sensitivity and Specificity Diffusion Postoperative Complications Intracranial Embolism Image Processing Computer-Assisted Humans Intraoperative Complications Aged |
| Zdroj: | AJNR Am J Neuroradiol |
| ISSN: | 0195-6108 |
| Popis: | BACKGROUND AND PURPOSE: Intraprocedural transcranial Doppler sonography has identified multiple microembolic events during and immediately after carotid endarterectomy (CEA) or angioplasty, yet the rate of clinically evident stroke is small. To determine the significance of the transcranial Doppler sonography findings, we examined patients by use of diffusion-weighted imaging and fluid-attenuated inversion recovery MR imaging before and immediately after CEA for evidence of clinically silent ischemic events. METHODS: Twenty-five patients with atherosclerotic disease of the carotid arteries underwent diffusion-weighted imaging and fluid-attenuated inversion recovery MR imaging performed, on average, 3 days before and 12 hours after CEA. Diffusion-weighted images were acquired in three orthogonal directions at b = 900. Pre- and postoperative neurologic examinations were performed by the same physician. RESULTS: After endarterectomy, 4.0% of the patients (one of 25 patients) showed a single, cortical focus of restricted diffusion and new fluid-attenuated inversion recovery hyperintensity, measuring |
| Databáze: | OpenAIRE |
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