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Ischemic Stroke ll: Pathophysiology01:15

Ischemic Stroke ll: Pathophysiology

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An ischemic stroke occurs when a cerebral blood vessel becomes obstructed, most often by a thrombus or embolus, interrupting the delivery of oxygen and glucose to brain tissue. Because neurons rely on continuous aerobic metabolism, energy failure begins within minutes of reduced perfusion. The region receiving the least blood flow becomes the infarct core, an area of irreversible cellular death. Surrounding this core lies the penumbra, a zone of hypoperfused but still viable tissue that is...
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Hemorrhagic Stroke ll: Pathophysiology01:29

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A hemorrhagic stroke develops when a cerebral blood vessel ruptures, allowing blood to escape into the surrounding brain tissue, as in intracerebral hemorrhage (ICH), or into the subarachnoid space, as in subarachnoid hemorrhage (SAH). Because the skull is a rigid compartment, the sudden presence of extravascular blood rapidly increases intracranial pressure and compresses adjacent neural structures, leading to immediate tissue injury and impaired cerebral perfusion.Mass Effect and Primary...
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The regulation of stroke volume, which is the amount of blood the heart pumps out during each heartbeat, is critical for maintaining a healthy circulatory system. Stroke volume is influenced by three main factors: preload, contractility, and afterload.
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A hemorrhagic stroke is an acute neurological event that occurs when a weakened cerebral blood vessel ruptures, allowing blood to accumulate within or around the brain. The sudden release of blood forms a focal hematoma that increases intracranial pressure, displaces neural tissue, and can obstruct cerebrospinal fluid pathways. These effects may be compounded by intraventricular extension of the hemorrhage, cerebral edema, or compression of adjacent structures, all of which contribute to...
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A Model for Encephalomyosynangiosis Treatment after Middle Cerebral Artery Occlusion-Induced Stroke in Mice
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Endoglin deficiency impairs stroke recovery.

Fanxia Shen1, Vincent Degos1, Pei-Lun Chu1

  • 1From the Department of Anesthesia and Perioperative Care, Center for Cerebrovascular Research (F.S., V.D., Z.H., E.M.W., E.-J.C., H.K., M.M., W.L.Y., H.S.) and Departments of Neurological Surgery (M.T.L., W.L.Y.) and Neurology (W.L.Y.), University of California, San Francisco; Department of Neurology, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China (F.S.); Department of Anesthesia and Intensive Care, INSERM, U676, Hôpital Robert Debré, Paris, France (V.D.); and Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC (P.-L.C., D.M.).

Stroke
|May 31, 2014
PubMed
Summary

Endoglin deficiency impairs stroke recovery in mice, leading to larger infarcts and poorer behavioral outcomes. This suggests endoglin plays a crucial role in brain injury repair mechanisms.

Keywords:
angiogenesis effectmacrophagestelangiectasia, hereditary hemorrhagic

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Area of Science:

  • Neuroscience
  • Vascular Biology
  • Genetics

Background:

  • Endoglin deficiency causes hereditary hemorrhagic telangiectasia-1, impacting myocardial repair and leading to pulmonary arteriovenous malformations.
  • These malformations increase the risk of paradoxical embolism and ischemic brain injury.

Purpose of the Study:

  • To investigate the hypothesis that endoglin deficiency impairs stroke recovery.
  • To analyze the role of endoglin in brain injury and repair processes.

Main Methods:

  • Eng heterozygous (Eng+/-) and wild-type mice underwent permanent distal middle cerebral artery occlusion (pMCAO).
  • Pial collateral vessels, infarct/atrophic volume, vascular density, and macrophages were quantified post-pMCAO.
  • Behavioral function was assessed using corner and adhesive removal tests.
  • Association between ENG 207G>A polymorphism and brain arteriovenous malformation outcomes was analyzed in human patients.

Main Results:

  • Eng+/- mice exhibited larger infarct volumes and worse behavioral performance compared to wild-type mice post-pMCAO.
  • Macrophage counts in the peri-infarct region differed between groups at various time points.
  • Eng+/- mice showed reduced vascular density in the peri-infarct region 60 days after pMCAO.
  • The ENG 207A allele was linked to worse outcomes in human patients with arteriovenous malformation rupture or surgery.

Conclusions:

  • Endoglin deficiency significantly impairs recovery from brain injury.
  • Potential mechanisms include reduced angiogenesis, impaired macrophage homing, and delayed inflammation resolution.