Document Detail


The gamut of blood flow responses coupled to spreading depolarization in rat and human brain: from hyperemia to prolonged ischemia.
MedLine Citation:
PMID:  21116926     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
Cortical spreading depolarizations (SD) have been shown to occur frequently in patients with aneurysmal subarachnoid hemorrhage (SAH) and are associated with delayed ischemic brain damage. In animal models the link between SD and cell damage is the microvascular spasm coupled to the passage of SDs, resulting in spreading ischemia. Here we compared the hemodynamic changes induced by SD between human and rat cerebral cortex. Specifically, we addressed the question, whether the full spectrum of regional cerebral blood flow (rCBF) responses to SD is found in the human brain in a similar fashion to animal models. SDs were identified by slow potential changes in electrocorticographic recordings and the rCBF response profiles and magnitudes were analyzed. We found a large variability of rCBF changes concomitant to SDs in rat and in human recordings. The spectrum ranged from normal hyperemic responses to prolonged cortical spreading ischemia with intermediate forms characterized by biphasic (hypoemic-hyperemic) responses. The bandwidths of rCBF responses were comparable and the relative response magnitudes of hypo- and hyperperfusion phases did not differ significantly between rats and humans. The correspondence of the rCBF response spectrum to SD between human and animal brain underscores the importance of animal models to learn more about the mechanisms underlying the early and delayed pathological sequelae of SAH.
Authors:
N Offenhauser; O Windmüller; A J Strong; S Fuhr; J P Dreier
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Acta neurochirurgica. Supplement     Volume:  110     ISSN:  0065-1419     ISO Abbreviation:  Acta Neurochir. Suppl.     Publication Date:  2011  
Date Detail:
Created Date:  2010-11-30     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100962752     Medline TA:  Acta Neurochir Suppl     Country:  Austria    
Other Details:
Languages:  eng     Pagination:  119-24     Citation Subset:  IM    
Affiliation:
Center for Stroke Research Berlin, Charité-University Medicine Berlin, Berlin, Germany.
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