Laser Doppler flowmetry predicts occlusion but not tPA-mediated reperfusion success after rat embolic stroke
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UMass Chan Affiliations
Department of NeurologyDocument Type
Journal ArticlePublication Date
2008-11-29Keywords
Animals*Brain Infarction
Cerebrovascular Circulation
Disease Models, Animal
*Infarction, Middle Cerebral Artery
therapy
Laser-Doppler Flowmetry
Magnetic Field Therapy
Male
Rats
Rats, Sprague-Dawley
*Reperfusion
Tetrazolium Salts
Time Factors
Tissue Plasminogen Activator
Neurology
Neuroscience and Neurobiology
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BACKGROUND AND PURPOSE: Laser Doppler flowmetry (LDF) is increasingly used to assess adequate occlusion after embolic stroke (ES) in rats. METHODS: Employing LDF, relative regional cerebral blood flow (rCBF) was continuously monitored during the first 2 h following ES and correlated with 24 h 2,3,5-triphenyltetrazolium chloride (TTC)-staining of corrected infarct volume. In a preliminary experiment (n=18), it was demonstrated that rCBF-reduction to 37% or less of baseline correctly identified occlusion success in the suture middle cerebral artery occlusion (sMCAO) model. Using the same methodology, we then assessed whether LDF allowed for identification of animals with successful ES (experiment 2, n=26) and tissue plasminogen activator (tPA)-mediated reperfusion following ES (experiment 3, n=28). RESULTS: In ES rats, 3 infarct patterns were identified: small (<150 mm(3)), medium ( approximately 250 mm(3)), and large (>400 mm(3)). Rats with an rCBF below 45% of preocclusion values had an 80% probability of developing medium to large infarcts, whereas rats with an rCBF above the 45%-threshold had a 100% chance of developing small infarcts. LDF did not reliably detect reperfusion in tPA-treated animals (sensitivity=40%), because it apparently occurred within brain areas remote from the LDF-monitoring site as indicated by TTC-staining and magnetic resonance angiography in a subset of animals. CONCLUSION: LDF is an excellent screening method to identify animals with successful ES; however, distinction of medium from large infarcts is not possible, the critical threshold for identifying adequate occlusion is higher than in the sMCAO model, and LDF poorly predicts tPA-mediated reperfusion.Source
Exp Neurol. 2009 Feb;215(2):290-7. Epub 2008 Nov 7. Link to article on publisher's siteDOI
10.1016/j.expneurol.2008.10.013Permanent Link to this Item
http://hdl.handle.net/20.500.14038/37696PubMed ID
19038254Related Resources
Link to Article in PubMedae974a485f413a2113503eed53cd6c53
10.1016/j.expneurol.2008.10.013