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Stroke Onset Time Using Sodium MRI in Rat Focal Cerebral Ischemia
Journal article   Open access   Peer reviewed

Stroke Onset Time Using Sodium MRI in Rat Focal Cerebral Ischemia

Stephen C. Jones, Alexander Kharlamov, Boris Yanovski, D. Kyle Kim, Kirk A. Easley, Victor E. Yushmanov, Scott K. Ziolko and Fernando E. Boada
Stroke (1970), v 37(3), pp 883-888
Mar 2006
DOI: https://doi.org/10.1161/01.STR.0000198845.79254.0f
PMID: 16424376
Featured in Collection :   UN Sustainable Development Goals @ Drexel
url
https://doi.org/10.1161/01.str.0000198845.79254.0fView
Published, Version of Record (VoR)Maybe Open Access (Publisher Bronze),  Open
url
https://doi.org/10.1161/01.STR.0000198845.79254.0fView
Published, Version of Record (VoR) Open

Abstract

Background and Purpose— Thrombolytic therapy with intravenous tPA must be administered within 3 hours after stroke onset. However, stroke onset time cannot be established in 20% to 45% of potential patients. We propose that the rate of increase of the brain concentration of sodium ([Na + ] br ) after stroke, monitored using sodium MRI in a rat model of cortical ischemia, is linear in each individual animal, can locate the ischemic region, and can be used to estimate onset time. Methods— After induction of focal cortical ischemia in rats under isoflurane anesthesia, [Na + ] br time course maps were acquired continuously on a 3 T whole body scanner from 2 to 7 hours after occlusion followed by T2-weighted proton images. Microtubule-associated protein-2 immunostained brain sections were used to verify the location of the infarct. Results— The ischemic region identified with microtubule-associated protein-2 corresponded to the region of maximum [Na + ] br increase ( P <0.001; n=5), and all of the animals demonstrated high linearity. [Na + ] br increased at a mean rate of 25±4.7%/h in ischemic tissue ( P =0.013) but not in normal cortex (1.0±1.1%/h; P =0.42). The mean onset time error was 1±4 minutes (n=4). Conclusions— These results of sodium MRI show that the region of maximum [Na + ] br increase corresponds to the ischemic region. Although [Na + ] br increases at a different rate in each animal, the increase is linear, and, therefore, onset time can be estimated. These findings suggest that this method can be used as a ticking clock to estimate time elapsed after vascular occlusion.

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53 citations in Web of Science
63 citations in Scopus

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Collaboration types
Domestic collaboration
Web of Science research areas
Clinical Neurology
Peripheral Vascular Disease
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