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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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Cerebral Edema l: Introduction01:19

Cerebral Edema l: Introduction

18
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...
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Cytotoxic Edema: Pathophysiology01:21

Cytotoxic Edema: Pathophysiology

14
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...
14
Pulmonary Edema II: Pathophysiology01:18

Pulmonary Edema II: Pathophysiology

24
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...
24
Diabetic Retinopathy01:27

Diabetic Retinopathy

48
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...
48
Heart Failure II: Pathophysiology01:29

Heart Failure II: Pathophysiology

1.7K
Systolic Heart Failure and Compensatory MechanismsSystolic heart failure (also termed HFrEF, Heart Failure with Reduced Ejection Fraction) is the most prevalent type of heart filure. It results in a decreased volume of blood being pumped from the ventricle. The aortic arch and carotid sinuses have baroreceptors that detect reduced blood pressure, triggering the sympathetic nervous system (SNS) to release epinephrine and norepinephrine. Initially, this response aims to boost heart rate and...
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Related Experiment Video

Updated: Apr 25, 2026

An Acute Retinal Model for Evaluating Blood Retinal Barrier Breach and Potential Drugs for Treatment
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[Pathopshysiological mechanisms in macular edema].

Cristian Turlea, Ileana Zolog, Codruta Blăjan

    Oftalmologia (Bucharest, Romania : 1990)
    |August 23, 2014
    PubMed
    Summary

    Intravitreal pharmacotherapy is now standard for diabetic macular edema, surpassing laser treatments. Emerging intravitreal devices offer new therapeutic options for this condition.

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    Area of Science:

    • Ophthalmology
    • Endocrinology
    • Pharmacology

    Context:

    • Diabetic macular edema (DME) treatment has rapidly evolved.
    • Shift from laser monotherapy to intravitreal pharmacotherapy is standard practice.
    • Intravitreal injections show continuous development and positive outcomes.

    Purpose:

    • To review current and future treatments for diabetic macular edema.
    • To evaluate the efficacy of intravitreal therapies compared to laser treatments.

    Summary:

    • Intravitreal pharmacotherapy, including injections and devices, is a viable and superior alternative to laser monotherapy for DME.
    • Recent clinical studies confirm the effectiveness of intravitreal treatments.
    • The article discusses advancements and future directions in DME management.

    Impact:

    • Highlights the significant progress in managing diabetic macular edema.
    • Provides insights into the benefits of intravitreal treatments for patients with DME.
    • Informs clinical practice and future research in retinal vascular diseases.