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Related Concept Videos

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...
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...
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...
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...
Ischemic Stroke ll: Pathophysiology01:15

Ischemic Stroke ll: Pathophysiology

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...
Imbalances in Cardiac Output01:26

Imbalances in Cardiac Output

The heart's primary function is to pump blood throughout the body, maintaining a balance between blood sent out (cardiac output) and blood returning (venous return). If this balance is disrupted, it can result in congestive heart failure (CHF), a severe condition where the heart becomes an inefficient pump, leading to inadequate blood circulation.
CHF can occur due to the failure of either side of the heart. Left-side failure leads to pulmonary congestion—the right side continues to send blood...

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Related Experiment Video

Updated: Jun 21, 2026

Dynamic Assessments of Coronary Flow Reserve after Myocardial Ischemia Reperfusion in Mice
05:07

Dynamic Assessments of Coronary Flow Reserve after Myocardial Ischemia Reperfusion in Mice

Published on: August 25, 2023

Dysfunction induced by ischemia versus edema: does edema matter?

Tanya L Butler1, Jonathan R Egan, Fabian G Graf

  • 1Kids Heart Research, The Children's Hospital at Westmead, Sydney, Australia.

The Journal of Thoracic and Cardiovascular Surgery
|July 7, 2009
PubMed
Summary
This summary is machine-generated.

Cardiac edema alone causes only mild dysfunction in heart cells and whole hearts, unlike ischemia-reperfusion injury. This suggests edema

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Measuring Post-Stroke Cerebral Edema, Infarct Zone and Blood-Brain Barrier Breakdown in a Single Set of Rodent Brain Samples
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Measuring Post-Stroke Cerebral Edema, Infarct Zone and Blood-Brain Barrier Breakdown in a Single Set of Rodent Brain Samples

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Ischemic Tissue Injury in the Dorsal Skinfold Chamber of the Mouse: A Skin Flap Model to Investigate Acute Persistent Ischemia
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Ischemic Tissue Injury in the Dorsal Skinfold Chamber of the Mouse: A Skin Flap Model to Investigate Acute Persistent Ischemia

Published on: November 17, 2014

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Last Updated: Jun 21, 2026

Dynamic Assessments of Coronary Flow Reserve after Myocardial Ischemia Reperfusion in Mice
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Measuring Post-Stroke Cerebral Edema, Infarct Zone and Blood-Brain Barrier Breakdown in a Single Set of Rodent Brain Samples
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Measuring Post-Stroke Cerebral Edema, Infarct Zone and Blood-Brain Barrier Breakdown in a Single Set of Rodent Brain Samples

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Ischemic Tissue Injury in the Dorsal Skinfold Chamber of the Mouse: A Skin Flap Model to Investigate Acute Persistent Ischemia
10:24

Ischemic Tissue Injury in the Dorsal Skinfold Chamber of the Mouse: A Skin Flap Model to Investigate Acute Persistent Ischemia

Published on: November 17, 2014

Area of Science:

  • Cardiology
  • Cell Biology
  • Physiology

Background:

  • Pediatric cardiac surgery recovery is impacted by ischemia-reperfusion injury, cardiac edema, and low cardiac output syndrome.
  • Previous studies linked edema and dysfunction, but confounding factors obscured a direct causal relationship.

Purpose of the Study:

  • To determine if cardiac edema directly causes cardiac dysfunction.
  • To differentiate the effects of edema from ischemia-reperfusion injury on cardiac function.

Main Methods:

  • Isolated cardiomyocytes and Langendorff-perfused hearts were subjected to either ischemia or edema induction.
  • Cellular function was assessed via shortening dynamics; whole heart function was measured by developed pressure.

Main Results:

  • Ischemia significantly impaired function in both isolated cells and whole hearts.
  • Edema alone, induced by hyposmotic solution, caused only mild dysfunction in cardiomyocytes and whole hearts.
  • Hearts tolerated edema levels exceeding those seen in clinical settings without lasting effects.

Conclusions:

  • The heart can tolerate significant edema without residual functional impairment.
  • Ischemia is a primary driver of contractile dysfunction post-cardiac surgery.
  • The clinical significance of edema-mediated dysfunction after cardiac surgery warrants re-evaluation.