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Related Concept Videos

Cerebral Edema ll: Pathophysiology01:22

Cerebral Edema ll: Pathophysiology

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 barrier loses...
Cerebral Edema l: Introduction01:19

Cerebral Edema l: Introduction

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...
Cytotoxic Edema: Pathophysiology01:21

Cytotoxic Edema: Pathophysiology

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 supply...
Pulmonary Edema II: Pathophysiology01:18

Pulmonary Edema II: Pathophysiology

Pulmonary edema is the accumulation of fluid in the interstitial and alveolar spaces of the lungs, impairing gas exchange and oxygen delivery. It may be cardiogenic or noncardiogenic, but both reduce oxygenation and lung compliance.Cardiogenic Pulmonary EdemaCardiogenic edema results from increased hydrostatic pressure in pulmonary capillaries, usually due to left ventricular dysfunction from myocardial infarction, heart failure, or valvular disease. Ineffective cardiac pumping causes blood to...
Diabetic Retinopathy01:27

Diabetic Retinopathy

DefinitionDiabetic retinopathy is a microvascular complication of diabetes affecting the retinal blood vessels.Risk FactorsDiabetic retinopathy is present in almost all individuals with type 1 diabetes and more than 60% of those with type 2 diabetes after two decades of disease.The risk increases with poor glycemic control, hypertension, dyslipidemia, smoking, pregnancy, and puberty.Although cataracts and glaucoma are also more frequent in people with diabetes, retinopathy remains the leading...
Increased Intracranial Pressure ll: Pathophysiology01:29

Increased Intracranial Pressure ll: Pathophysiology

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 with...

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Related Experiment Video

Updated: Jun 10, 2026

Characterization of Vascular Morphology of Neovascular Age-Related Macular Degeneration by Indocyanine Green Angiography
05:14

Characterization of Vascular Morphology of Neovascular Age-Related Macular Degeneration by Indocyanine Green Angiography

Published on: August 11, 2023

Macular edema. General pathophysiology.

Albert Augustin, Anat Loewenstein, Baruch D Kuppermann

    Developments in Ophthalmology
    |August 13, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Macular edema, a vision-threatening condition, results from various eye diseases. Understanding its complex causes, including inflammation and ischemia, is key to developing effective treatments.

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    Enrichment of Bruch's Membrane from Human Donor Eyes
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    Enrichment of Bruch's Membrane from Human Donor Eyes

    Published on: November 15, 2015

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    Characterization of Vascular Morphology of Neovascular Age-Related Macular Degeneration by Indocyanine Green Angiography
    05:14

    Characterization of Vascular Morphology of Neovascular Age-Related Macular Degeneration by Indocyanine Green Angiography

    Published on: August 11, 2023

    Enrichment of Bruch's Membrane from Human Donor Eyes
    10:22

    Enrichment of Bruch's Membrane from Human Donor Eyes

    Published on: November 15, 2015

    Area of Science:

    • Ophthalmology
    • Pathophysiology
    • Retinal Diseases

    Background:

    • Macular edema is a frequent outcome of diverse ocular pathologies.
    • It is associated with conditions such as diabetic retinopathy and retinal vascular occlusions.
    • Post-surgical and inherited retinal disorders can also lead to macular edema.

    Purpose of the Study:

    • To detail the pathogenetic mechanisms contributing to macular edema.
    • To explain the role of blood-ocular barrier breakdown and inflammation.
    • To explore the impact of ischemic processes on macular edema development.

    Main Methods:

    • Review of existing literature on macular edema pathophysiology.
    • Analysis of cytokine release and inflammatory pathways.
    • Examination of ischemic complications in ocular disorders.

    Main Results:

    • Identified breakdown of the blood-ocular barrier as a central mechanism.
    • Highlighted the role of inflammatory cytokines in edema formation.
    • Described how ischemic processes can exacerbate macular edema.

    Conclusions:

    • Macular edema results from a complex interplay of factors.
    • Understanding these mechanisms is crucial for managing related ocular conditions.
    • Further research into specific pathogenetic pathways may yield targeted therapies.