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Hepatic Encephalopathy

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...

Ischemic Stroke ll: Pathophysiology

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...

Cytotoxic Edema: Pathophysiology

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...

Hypoxia

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%.
Types of Hypoxia
There are four primary types of hypoxia, each resulting from a different cause:
1. Anemic hypoxia: This type occurs due to insufficient oxygen delivery caused by a lack of red blood cells (RBCs) or RBCs with abnormal or...

Cerebral Edema ll: Pathophysiology

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...

Acute Respiratory Failure-II

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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:

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Updated: Jul 5, 2026

The Hypoxic Ischemic Encephalopathy Model of Perinatal Ischemia

The Hypoxic Ischemic Encephalopathy Model of Perinatal Ischemia

Published on: November 19, 2008

Hypoxic Ischemic Encephalopathy.

Edgar Zamora¹, Carlos Zamora²

¹Department of Diagnostic Radiology, Thomas Jefferson University, Philadelphia, PA, USA.

Neuroimaging Clinics of North America

|July 3, 2026

Summary

Hypoxic-ischemic encephalopathy (HIE) results from brain oxygen deprivation. This article explains HIE mechanisms and how MRI findings change over time to assess injury severity.

Keywords:

Basal ganglia Cardiac arrest Diffusion-weighted imaging Hypoxic ischemic encephalopathy MR imaging Neonatal brain Prognosis Thalamus

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Last Updated: Jul 5, 2026

The Hypoxic Ischemic Encephalopathy Model of Perinatal Ischemia

The Hypoxic Ischemic Encephalopathy Model of Perinatal Ischemia

Published on: November 19, 2008

A Piglet Model of Neonatal Hypoxic-Ischemic Encephalopathy

A Piglet Model of Neonatal Hypoxic-Ischemic Encephalopathy

Published on: May 16, 2015

Continuous Video Electroencephalogram during Hypoxia-Ischemia in Neonatal Mice

Continuous Video Electroencephalogram during Hypoxia-Ischemia in Neonatal Mice

Published on: June 11, 2020

Area of Science:

Neurology
Radiology
Pediatric Neurology

Background:

Hypoxic-ischemic encephalopathy (HIE) is a critical condition caused by insufficient oxygen and blood flow to the brain.
Neuroimaging is crucial for diagnosing HIE and evaluating acute encephalopathy of unknown origin.
Magnetic Resonance (MR) imaging is the preferred method for assessing HIE, determining injury acuity, extent, and severity.

Purpose of the Study:

To outline the fundamental mechanisms underlying selective brain vulnerability in HIE.
To describe the temporal evolution of MRI findings in HIE patients.
To provide a comprehensive overview of MRI's role in HIE evaluation.

Main Methods:

Review of established knowledge on HIE pathophysiology.
Analysis of neuroimaging literature focusing on MRI in HIE.
Description of characteristic MRI findings and their progression.

Main Results:

Detailed explanation of selective neuronal vulnerability mechanisms in HIE.
Chronological description of how MRI features manifest and change post-insult.
Emphasis on MRI's capability to estimate injury characteristics.

Conclusions:

MRI is essential for diagnosing and characterizing HIE.
Understanding the evolution of MRI findings aids in prognosis and management.
This review provides a framework for interpreting MRI in HIE.