Comparison between coated vs. uncoated suture middle cerebral artery occlusion in the rat as assessed by perfusion/diffusion weighted imaging

UMMS Affiliation

Department of Neurology

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Document Type



Animals; *Cerebrovascular Circulation; Diffusion; *Diffusion Magnetic Resonance Imaging; *Disease Models, Animal; Functional Laterality; Infarction, Middle Cerebral Artery; Male; Perfusion; Rats; Rats, Sprague-Dawley; Silicon; Surface Properties; Sutures; Tetrazolium Salts; Time Factors


Molecular and Cellular Neuroscience | Neuroscience and Neurobiology | Radiology


Differences among models in the temporal evolution of ischemia after middle cerebral artery occlusion (MCAO) in rats may considerably influence the results of experimental treatment studies. Using diffusion and perfusion imaging, we compared the spatiotemporal evolution of ischemia in Sprague-Dawley rats after permanent MCAO (pMCAO) with different types of sutures. Male Sprague-Dawley rats were randomly assigned to pMCAO produced with either 4-0 silicone coated (n=8), or 3-0 uncoated monofilaments (n=8). Serial determination of quantitative cerebral blood flow (CBF) and apparent diffusion coefficient (ADC) maps were performed up to 3 h after pMCAO. Lesion volumes were calculated by using previously validated thresholds and correlated with infarct volume corrected for edema defined by 2,3,5-triphenyltetrazolium chloride (TTC) staining at 24 h after MCAO. The ADC/CBF-defined mismatch volume in the 4-0 coated suture model was present significantly longer (up to 120 min) compared to the uncoated 3-0 suture model (30 min). The TTC-derived infarct volume was significantly larger in the coated model (290.3+/-32.8 mm(3)) relative to the uncoated model (252.3+/-34.6 mm(3)). This study demonstrates that the type of suture may significantly influence the spatiotemporal evolution of the ADC/CBF-mismatch as well as the final infarct volume. These inter-model variations must be taken into account when assessing new therapeutic approaches on ischemic lesion evolution in the rat MCAO model.

DOI of Published Version



Neurosci Lett. 2007 Feb 2;412(3):185-90. Epub 2006 Nov 22. Link to article on publisher's site

Journal/Book/Conference Title

Neuroscience letters

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