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Related Concept Videos

Ischemic Stroke l: Introduction01:15

Ischemic Stroke l: Introduction

Ischemic stroke is an acute cerebrovascular condition in which blood flow to a brain region is suddenly interrupted, leading to tissue infarction. Neurons depend on continuous oxygen and glucose supply, so even brief reductions in perfusion cause energy failure, ionic imbalance, and irreversible injury. Ischemic strokes are classified into thrombotic and embolic types based on their underlying mechanisms.Thrombotic MechanismsThrombotic stroke develops when a clot forms within a cerebral artery.
Traumatic Brain Injury l: Introduction01:28

Traumatic Brain Injury l: Introduction

DefinitionTraumatic brain injury, or TBI, is a disturbance of normal brain function induced by an external mechanical force, such as a direct blow to the head or a penetrating injury. It can affect both brain structure and function, producing a wide range of clinical outcomes. TBI is a heterogeneous condition, meaning its effects may differ based on the type, location, and severity of the injury.Basis of ClassificationTBI is classified based on severity, injury mechanism, or pathophysiology. In...
Neuroplasticity01:01

Neuroplasticity

Neuroplasticity reflects the brain's remarkable capacity to adapt and evolve, responding dynamically to learning, experiences, or injury by reorganizing its neural circuitry. This reorganization involves creating new neural connections and refining old ones through a series of biological processes that contribute to the brain's lifelong development and adaptability.
Ischemic Stroke ll: Pathophysiology01:15

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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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Related Experiment Video

Updated: May 18, 2026

Randomized, Triple-Blind, and Parallel-Controlled Trial of Transcranial Direct Current Stimulation for Cognitive Rehabilitation after Stroke
08:53

Randomized, Triple-Blind, and Parallel-Controlled Trial of Transcranial Direct Current Stimulation for Cognitive Rehabilitation after Stroke

Published on: June 6, 2025

Training the brain to survive stroke.

Jeff F Dunn1, Ying Wu, Zonghang Zhao

  • 1Department of Radiology, Faculty of Medicine, University of Calgary, Calgary, Alberta, Canada. dunnj@ucalgary.ca

Plos One
|October 3, 2012
PubMed
Summary
This summary is machine-generated.

Pre-conditioning the brain to low oxygen (hypoxia) enhances its ability to recover from stroke. This adaptive mechanism, involving increased capillary density, significantly reduces brain damage and improves outcomes after ischemic events.

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Last Updated: May 18, 2026

Randomized, Triple-Blind, and Parallel-Controlled Trial of Transcranial Direct Current Stimulation for Cognitive Rehabilitation after Stroke
08:53

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Published on: June 6, 2025

Cognitive Function and Upper Limb Rehabilitation Training Post-Stroke Using a Digital Occupational Training System
07:35

Cognitive Function and Upper Limb Rehabilitation Training Post-Stroke Using a Digital Occupational Training System

Published on: December 29, 2023

Area of Science:

  • Neuroscience
  • Physiology
  • Pathology

Background:

  • Limited therapeutic options exist for repairing brain tissue post-stroke.
  • The mammalian brain may possess intrinsic adaptive capacities to hypoxia, potentially improving outcomes from ischemic episodes.
  • Chronic hypoxia exposure can increase capillary density and tissue oxygen levels, enhancing survival during ischemia.

Purpose of the Study:

  • To investigate the brain's intrinsic capacity to adapt to chronic hypoxia.
  • To determine if hypoxic acclimation improves outcomes following a reversible ischemic stroke.
  • To identify adaptive mechanisms that could be stimulated to improve stroke recovery.

Main Methods:

  • Rats were acclimated to hypoxia (living at half an atmosphere for 3 weeks).
  • Capillary density was measured morphometrically, and brain oxygen partial pressure was monitored using implantable sensors.
  • Ischemic stroke was induced via middle cerebral artery occlusion, followed by assessment of behavioral scores, lesion volume (T2-weighted MRI), and inflammatory markers.

Main Results:

  • Hypoxic acclimation increased cortical capillary density by 30% and brain oxygen partial pressure by 40%.
  • Acclimated rats showed improved behavioral scores and a 52% reduction in MRI-defined lesion volumes post-stroke.
  • A significant reduction in neuroinflammation was observed, with decreased lymphocytes (27-33%) and ED1-positive cells (35-45%).

Conclusions:

  • Natural adaptive mechanisms in the brain can be stimulated to reduce stroke damage and improve outcomes.
  • Protection against ischemic damage appears linked to morphological changes like angiogenesis, occurring even after initial adaptive factors normalize.
  • Pre-conditioning strategies, such as exercise or pharmaceuticals, could potentially halve the severity of stroke damage, though not necessarily reduce incidence.