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Related Concept Videos

Cerebral Edema ll: Pathophysiology01:22

Cerebral Edema ll: Pathophysiology

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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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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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Bacterial Meningitis II: Pathophysiology01:26

Bacterial Meningitis II: Pathophysiology

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Bacterial meningitis typically begins when pathogens such as Neisseria meningitidis and Streptococcus pneumoniae colonize the nasopharynx and invade the bloodstream. This process is facilitated by bacterial virulence factors, such as polysaccharide capsules, which resist phagocytosis and complement-mediated killing. Less commonly, bacteria reach the central nervous system via contiguous spread from infections like otitis media or sinusitis, through congenital or acquired dural defects, or...
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Cerebral Edema l: Introduction01:19

Cerebral Edema l: Introduction

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Cerebral edema is a pathological increase in brain water content that disrupts intracranial pressure regulation and impairs neurological function. Because the cranial vault is rigid, even modest increases in tissue volume can compromise cerebral perfusion, distort neural structures, and initiate secondary injury. Cerebral edema develops through four principal mechanisms: vasogenic, cytotoxic, interstitial, and ionic.Vasogenic EdemaVasogenic edema arises from disruption of the blood–brain...
30
Increased Intracranial Pressure ll: Pathophysiology01:29

Increased Intracranial Pressure ll: Pathophysiology

20
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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Cytotoxic Edema: Pathophysiology01:21

Cytotoxic Edema: Pathophysiology

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Cytotoxic edema is a form of cerebral edema characterized by intracellular swelling of neurons, astrocytes, and other glial cells. It develops when the mechanisms responsible for maintaining ionic gradients across the cell membrane become impaired. Under normal physiological conditions, the sodium–potassium ATPase actively transports sodium ions out of the cell and potassium ions into the cell, preserving osmotic balance and enabling electrical signaling. This pump requires a continuous...
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A Mouse Model of Orthopedic Surgery to Study Postoperative Cognitive Dysfunction and Tissue Regeneration
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Cerebral protection: inflammation, endothelial dysfunction, and postoperative cognitive dysfunction.

Bernhard Riedel1, Kimberley Browne, Brendan Silbert

  • 1aDepartment of Anaesthesia and Pain Medicine, Peter MacCallum Cancer Center bDepartment of Anaesthesia, St Vincent's Hospital, University of Melbourne, Melbourne, Victoria, Australia.

Current Opinion in Anaesthesiology
|December 5, 2013
PubMed
Summary
This summary is machine-generated.

Postoperative cognitive dysfunction (POCD) may stem from a neuro-inflammatory response triggered by surgery. Understanding inflammation and endothelial dysfunction is key to preventing cognitive decline in elderly patients.

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Area of Science:

  • Anesthesiology
  • Neuroscience
  • Immunology

Background:

  • Postoperative cognitive dysfunction (POCD) affects ~15% of patients over 60.
  • The exact pathophysiology of POCD remains unclear.
  • POCD is a recognized perioperative syndrome following anesthesia and surgery.

Purpose of the Study:

  • To review recent advancements in understanding POCD pathophysiology.
  • To update anesthesiologists on POCD mechanisms.
  • To explore the link between inflammation and cognitive decline.

Main Methods:

  • Review of recent evidence on POCD.
  • Exploration of neuro-inflammatory pathways.
  • Analysis of the blood-brain barrier's role.

Main Results:

  • Neuro-inflammation, driven by surgery, is a likely mediator of POCD.
  • Inflammatory insults can compromise the blood-brain barrier.
  • Endothelial dysfunction may exacerbate neuro-inflammation and cognitive decline.

Conclusions:

  • A neuro-inflammatory cascade, potentially worsened by endothelial dysfunction, plays a central role in POCD.
  • Future research should focus on molecular mechanisms, biomarkers, and anti-inflammatory strategies.
  • Targeting these pathways is crucial, especially for the elderly, who are more susceptible.