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Related Concept Videos

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...
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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...
Hypoxia01:23

Hypoxia

Hypoxia is a medical condition characterized by an inadequate oxygen supply to body tissues. It typically manifests as a bluish discoloration of the skin and mucosae, especially in fair-skinned individuals, when hemoglobin (Hb) saturation drops below 75%.
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Hepatic Encephalopathy01:29

Hepatic Encephalopathy

DefinitionHepatic encephalopathy is a reversible neurologic syndrome that results from advanced liver dysfunction or portosystemic shunting. It leads to disturbances in cognition, behavior, and motor function due to the brain’s exposure to gut-derived toxins that the liver fails to detoxify.EtiologyThis condition develops either in the setting of acute fulminant hepatitis or progressively during chronic liver disease, such as cirrhosis and portal hypertension. Portosystemic shunting—including...
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Acute Respiratory Failure-II

Type I Respiratory Failure, or hypoxemic respiratory failure, occurs when the partial pressure of oxygen (PaO2) in arterial blood falls below 60 mmHg while breathing room air without a corresponding increase in arterial carbon dioxide levels (PaCO2). This condition highlights a significant impairment in the lungs' capacity to oxygenate the blood.
The underlying physiological abnormalities that contribute to hypoxemic respiratory failure include:
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 barrier loses...

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The Hypoxic Ischemic Encephalopathy Model of Perinatal Ischemia
08:47

The Hypoxic Ischemic Encephalopathy Model of Perinatal Ischemia

Published on: November 19, 2008

The chilling details: hypoxic-ischemic encephalopathy.

M Terese Verklan1

  • 1University of Texas Health Science Center at Houston, School of Nursing, Houston, TX 77459, USA. M.T.Verklan@uth.tmc.edu

The Journal of Perinatal & Neonatal Nursing
|February 12, 2009
PubMed
Summary

Hypoxic-ischemic encephalopathy (HIE) is a critical newborn complication from oxygen and glucose deprivation. Therapeutic hypothermia offers a window to mitigate this severe brain injury.

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Area of Science:

  • Neonatal Medicine
  • Neuroscience
  • Perinatal Biology

Background:

  • Hypoxic-ischemic encephalopathy (HIE) is a significant cause of newborn morbidity and mortality.
  • HIE results from oxygen and glucose deprivation to the brain, leading to primary and secondary energy failure.
  • The injury cascade involves acidosis, excitotoxicity, and oxidative stress, culminating in neuronal cell death.

Purpose of the Study:

  • To review the pathophysiology of HIE.
  • To discuss the biphasic nature of brain injury in HIE.
  • To highlight the therapeutic potential of hypothermia in managing HIE.

Main Methods:

  • Review of experimental animal research.
  • Analysis of clinical observations in human neonates.
  • Synthesis of current understanding of HIE pathogenesis.

Main Results:

  • HIE injury occurs in two distinct phases, separated by a period of relative quiescence.
  • Cellular damage mechanisms include energy failure, excitotoxicity, and oxidative stress.
  • Clinical presentation varies with insult severity and duration, evolving over 72 hours.

Conclusions:

  • Understanding the biphasic injury pattern is crucial for timely intervention.
  • Therapeutic hypothermia represents a key strategy to target the window of opportunity in HIE.
  • Early and appropriate management can ameliorate brain injury and improve outcomes in newborns with HIE.