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The pattern and role of brain plasticity in stroke recovery has been incompletely characterized. Both ipsilesional and contralesional changes have been described, but it remains unclear how these relate to functional recovery. Our goal was to correlate brain activation patterns with tissue damage, hemodynamics, and neurologic status after temporary stroke,(More)
BACKGROUND AND PURPOSE Recent studies suggest that normobaric oxygen therapy (NBO) is neuroprotective in acute ischemic stroke. METHODS We performed multivoxel magnetic resonance spectroscopic imaging and diffusion/perfusion MRI in patients with stroke treated with NBO or room air. Imaging was performed before, during, and after therapy. RESULTS(More)
Regular, evidence-based assignment of patients to etiologic stroke categories is essential to enable valid comparison among studies. We designed an algorithm (SSS-TOAST) that incorporated recent advances in stroke imaging and epidemiology to identify the most probable TOAST category in the presence of evidence for multiple mechanisms. Based on the weight of(More)
The aim of this study was to investigate functional reorganization of motor systems by probing connectivity between motor related areas in chronic stroke patients using functional magnetic resonance imaging (fMRI) in conjunction with a novel MR-compatible hand-induced, robotic device (MR_CHIROD). We evaluated data sets obtained from healthy volunteers and(More)
BACKGROUND AND PURPOSE Therapies that transiently prevent ischemic neuronal death can potentially extend therapeutic time windows for stroke thrombolysis. We conducted a pilot study to investigate the effects of high-flow oxygen in acute ischemic stroke. METHODS We randomized patients with acute stroke (<12 hours) and perfusion-diffusion "mismatch" on(More)
BACKGROUND Hyperbaric oxygen therapy is considered an important stroke treatment strategy. BACKGROUND To determine whether normobaric oxygen is neuroprotective, and, if so, what the therapeutic time window is. METHODS Experiment 1-Serial diffusion- and perfusion-weighted MRI (DWI and PWI) was performed after middle cerebral artery filament occlusion(More)
BACKGROUND Postpartum angiopathy (PPA) is a cerebral vasoconstriction syndrome of uncertain cause that affects large and medium-sized cerebral arteries. Postpartum angiopathy is frequently complicated by ischemic stroke. The reversible posterior leukoencephalopathy syndrome (RPLS) is a distinct clinical-radiological entity characterized by transient(More)
The phenomenon of reversible cerebral arterial segmental vasoconstriction has been associated with several conditions including pregnancy and puerperium ("postpartum angiopathy"), thunderclap headache, and use of vasoconstrictive medications. Patients with cerebral vasoconstriction typically present with sudden, severe, and recurrent ("thunderclap")(More)
A major limitation in thrombolysis for acute ischemic stroke is the restricted time window for safe and effective therapy. Any method that can extend the reperfusion time window would be important. In this study, we show that normobaric hyperoxia extends the time window for effective reperfusion from 1 to 3 hours in rats subjected to focal cerebral(More)