Journal of neuroimaging : official journal of the American Society of Neuroimaging
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Comparative Study
Contribution of high-b-value diffusion-weighted imaging in determination of brain ischemia in transient ischemic attack patients.
High-b-value diffusion-weighted imaging (DWI) (b = 2,000 and b = 3,000 second/mm(2)) offers theoretical advantages over DWI examinations at b = 1,000 second/mm(2) for detection of acute ischemic stroke. The purpose of this study was to determine whether high-b-value DWI are better than b = 1,000 images in TIA patients. ⋯ High-b-value DWI did not improve the conspicuity and distinction of the ischemic lesions.
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Age-related white matter changes (WMC) increase risk of cognitive and functional decline. They are considered as target for preventive trials. However, using magnetic resonance imaging (MRI) to screen for subclinical WMC is not cost-effective. We explored the clinical utility of transcranial Doppler ultrasound (TCD) in the evaluation of WMC. We hypothesized that the pulsatility index (PI) of TCD correlates with severity of WMC. ⋯ PI correlates with volume of WMC. It may help to differentiate those with and without WMC in stroke patients. Further study evaluating the clinical utility of TCD in screening for subclinical WMC among community elderly is warranted.
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Case Reports
Subclavian steal syndrome like appearance resulting from a vertebral artery origin stenosis: a case report.
Partial steal has been regarded as a classic ultrasound appearance of subclavian steal syndrome. We report a case with the vertebral artery origin stenosis and intact subclavian artery, which showed the similar partial steal ultrasound features. The following computerized tomography angiography confirmed the stenosis. Therefore, when an alternating flow in the vertebral artery is detected, the investigation of its origin must be performed besides the ipsilateral subclavian artery.
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Case Reports
Acute stroke, catheter related venous thrombosis, and paradoxical cerebral embolism: report of two cases.
Patent foramen ovale (PFO) has been associated with cryptogenic stroke, particularly in young adults. However, the source of particles leading to cerebral embolism remains frequently unknown despite comprehensive evaluation. ⋯ PFO associated with large venous access site thrombosis was the most likely mechanism of stroke in both cases. Local thrombosis at sites of large venous access may be an overlooked source of paradoxical embolism in patients with PFO as well as a preventable cause of stroke in critically ill patients.