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Related Concept Videos

Hemorrhagic Stroke ll: Pathophysiology01:29

Hemorrhagic Stroke ll: Pathophysiology

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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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Traumatic Brain Injury l: Introduction01:28

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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...
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Spinal Cord Injury ll: Pathophysiology01:14

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Spinal cord injury progresses through two interconnected phases: primary injury and secondary injury.Primary InjuryPrimary injury happens at the moment of trauma and involves immediate mechanical damage to the spinal cord.Compression happens when broken vertebrae, herniated discs, or accumulating blood (such as a hematoma) press directly against the spinal cord, distorting its normal shape and function. In cases of contusion, the cord is bruised by a blunt force (like penetrating injuries or...
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Increased Intracranial Pressure ll: Pathophysiology01:29

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Increased intracranial pressure (ICP) refers to a potentially life-threatening rise in pressure inside the skull. This usually happens when there is a major change in the volume of brain tissue, blood, or cerebrospinal fluid (CSF) — the three components inside the skull. According to the Monro-Kellie doctrine, if the volume of one component increases, the volumes of the other components must decrease to maintain normal pressure. If this does not happen, ICP rises.The process often begins...
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Cerebral Edema ll: Pathophysiology01:22

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Vasogenic edema is a major form of cerebral edema characterized by abnormal accumulation of fluid in the brain’s extracellular space due to disruption of the blood–brain barrier (BBB). The BBB is a specialized structure composed of endothelial cells connected by tight junctions, supported by astrocytic endfeet and a basement membrane. Under normal conditions, it tightly regulates the movement of ions, proteins, and solutes between the bloodstream and brain parenchyma. When this...
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Secondary Spinal Cord Injury llI: Pathophysiology01:25

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Early Ischemia and Ionic ImbalanceWithin minutes of spinal cord injury, a secondary cascade begins, progressing over hours to weeks. Vascular damage reduces blood flow, causing ischemia and mitochondrial dysfunction. ATP depletion leads to ion pump failure, membrane depolarization, sodium influx, potassium efflux, and water accumulation, resulting in cellular swelling. Increased intracellular calcium further disrupts mitochondria and accelerates cellular injury.Excitotoxicity and Neuronal...
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A Mouse Model of Single and Repetitive Mild Traumatic Brain Injury
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The Pathophysiology of Concussive Brain Injury.

Bradley R Shane1, Ann N Hoffman2, Mayumi Prins3

  • 1David Geffen School of Medicine, UCLA Steve Tisch BrainSPORT Program; Department of Pediatrics, University of California Los Angeles, Los Angeles, CA, USA; Department of Neurology, University of California Los Angeles, Los Angeles, CA, USA.

Clinics in Sports Medicine
|March 5, 2026
PubMed
Summary
This summary is machine-generated.

Concussion is a complex brain injury impacting brain cells and leading to metabolic issues. Understanding cellular responses and individual patient types helps prevent further injury and guides personalized recovery strategies.

Keywords:
Axonal dysfunctionBiomarkersConcussionEndotypesNeuroinflammationNeurometabolic cascadePersisting post-concussion symptoms (PPCS)Traumatic brain injury

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Traumatic Brain Injury

Background:

  • Concussion is a complex brain injury affecting neurons and nonneuronal cells.
  • It causes acute neurometabolic disturbances, including ionic imbalance and energy crisis.
  • Cellular responses can lead to inflammation, blood-brain barrier disruption, and neurodegeneration.

Purpose of the Study:

  • To explore the cellular mechanisms underlying concussion.
  • To understand the role of biological vulnerability and repeat concussions.
  • To investigate the concept of postconcussion endotypes for targeted treatment.

Main Methods:

  • Review of cellular responses in concussion.
  • Analysis of factors contributing to biological vulnerability.
  • Examination of the endotype concept in persistent postconcussion symptoms.

Main Results:

  • Concussion affects multiple brain cell types, including astrocytes, oligodendrocytes, microglia, and endothelial cells.
  • Cellular responses extend beyond metabolism to influence inflammation, BBB integrity, neuroplasticity, glymphatic function, and neurodegeneration.
  • The concept of endotypes links persistent symptoms to specific biological mechanisms.

Conclusions:

  • Recognizing biological vulnerability and repeat concussion risks informs protective protocols.
  • Postconcussion endotypes offer a framework for personalized diagnosis and treatment.
  • Ongoing research into biomarkers and mechanisms is crucial for improved prognostication and recovery.