Objective: Embolic occlusion of the middle cerebral artery (MCA) leads to distal perfusion deficits as the vessel is recanalized. However, the mechanism for the perfusion deficits is not fully understood. The authors examined whether distal movement of fragments formed from the original thrombus contributes to the perfusion deficits.
Methods: In the first series, they studied whether the reduction in perfusion deficits is due to the dissolution of the original clots embolized or due to collateral perfusion. In the second series, they studied whether fragments formed from the original clots move to distal arterial system. In the third series, they studied whether plasminogen activator plays a role in the thrombolysis following ischemia.
Results: Occlusion of MCA permanently resulted in large perfusion deficits in the ipsilateral hemisphere, and these perfusion deficits did not change significantly after the occlusion. In contrast, perfusion deficits reduced significantly in a model of transient MCA occlusion. The numbers of fragments formed from the original clots increased gradually after the MCA occlusion in the ischemic injured brain. In addition, expression of urokinase plasminogen activator was also upregulated.
Conclusion: The present study thus reveals the mechanisms of the downstream arterial occlusion following the dissolution of original thrombus.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1080/10739680600556936 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Current Role of CT Pulmonary Angiography in Pulmonary Embolism: A State-of-the-Art Review.
J Imaging
December 2024
Radiology Department, Clinica Universidad de Navarra, Calle Santa Marta n. 1, 28027 Madrid, Spain.
The purpose of this study is to conduct a literature review on the current role of computed tomography pulmonary angiography (CTPA) in the diagnosis and prognosis of pulmonary embolism (PE). It addresses key topics such as the quantification of the thrombotic burden, its role as a predictor of mortality, new diagnostic techniques that are available, the possibility of analyzing the thrombus composition to differentiate its evolutionary stage, and the applicability of artificial intelligence (AI) in PE through CTPA. The only finding from CTPA that has been validated as a prognostic factor so far is the right ventricle/left ventricle (RV/LV) diameter ratio being >1, which is associated with a 2.
View Article and Find Full Text PDFRethinking Arterial Spin Labeling Perfusion in Neurodegeneration Considering Global and Regional Changes.
Cureus
November 2024
Diagnostic Imaging, St. Marina University Hospital, Varna, BGR.
Recent advancements in arterial spin labeling (ASL) MRI have significantly improved our understanding of cerebral perfusion in neurodegenerative diseases. Traditionally, the focus has been on regional perfusion deficits corresponding to specific neural pathologies. However, this localized approach may overlook the influence of global cerebral blood flow alterations.
View Article and Find Full Text PDFAdequate post-ischemic reperfusion of the mouse brain requires endothelial NFAT5.
Acta Neuropathol Commun
December 2024
Institute of Physiology and Pathophysiology, Department of Cardiovascular Physiology, Heidelberg University, Heidelberg, Germany.
Severity and outcome of strokes following cerebral hypoperfusion are significantly influenced by stress responses of the blood vessels. In this context, brain endothelial cells (BEC) regulate inflammation, angiogenesis and the vascular resistance to rapidly restore perfusion. Despite the relevance of these responses for infarct volume and tissue recovery, their transcriptional control in BEC is not well characterized.
View Article and Find Full Text PDFBlood-brain barrier breakdown in brain ischemia: Insights from MRI perfusion imaging.
Neurotherapeutics
December 2024
Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, United States; Neurocritical Care Division, Department of Anesthesiology and Critical Care Medicine, Johns Hopkins University School of Medicine, MD, United States; Department of Neurosurgery, Johns Hopkins University School of Medicine, Baltimore, MD, United States; Department of General Internal Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, United States. Electronic address:
Brain ischemia is a major cause of neurological dysfunction and mortality worldwide. It occurs not only acutely, such as in acute ischemic stroke (AIS), but also in chronic conditions like cerebral small vessel disease (cSVD). Any other conditions resulting in brain hypoperfusion can also lead to ischemia.
View Article and Find Full Text PDFTranscranial Cortex-Wide Imaging of Murine Ischemic Perfusion With Large-Field Multifocal Illumination Microscopy.
Stroke
January 2025
Institute of Pharmacology and Toxicology, Faculty of Medicine, University of Zurich, Switzerland (Z.C., Q.Z., Y.-H.L., C.G., I.G., M.W., H.A.I.Y., D.R.K., B.W., D.R.).
Background: Ischemic stroke is a common cause of death worldwide and a main cause of morbidity. Presently, laser speckle contrast imaging, x-ray computed tomography, and magnetic resonance imaging are the mainstay for stroke diagnosis and therapeutic monitoring in preclinical studies. These modalities are often limited in terms of their ability to map brain perfusion with sufficient spatial and temporal resolution, thus calling for development of new brain perfusion techniques featuring rapid imaging speed, cost-effectiveness, and ease of use.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!