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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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Hyperglycemia delays terminal depolarization and enhances repolarization after peri-infarct spreading depression as measured by serial diffusion MR mapping.

We investigated the effect of hyperglycemia on the initiation and propagation of spreading depression-like peri-infarct ischemic depolarization (SD) induced by focal cerebral ischemia in rats. Peri-infarct SD were monitored during the initial 15 minutes after remotely induced middle cerebral artery occlusion (MCAO) using serial diffusion weighted magnetic resonance imaging. Maps of the apparent diffusion coefficient (ADC) were calculated and ADC decreases were monitored over time. Hyperglycemic rats (n = 6) had a significant prolongation of the time from induction of MCAO to the start of the ADC decrease as compared with normoglycemic control rats. The time to the maximal ADC decrease was significantly delayed and recovery of transient ADC declines in the area adjacent to the ischemic core was significantly faster in hyperglycemic rats. We conclude that hyperglycemia delays the terminal depolarization in the ischemic core and supports a faster repolarization in severely mal-perfused penumbral tissue after SD, which reflects the increased availability of energy substrates in the state of hyperglycemia.[1]

References

  1. Hyperglycemia delays terminal depolarization and enhances repolarization after peri-infarct spreading depression as measured by serial diffusion MR mapping. Els, T., Röther, J., Beaulieu, C., de Crespigny, A., Moseley, M. J. Cereb. Blood Flow Metab. (1997) [Pubmed]
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