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Related Concept Videos

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...
Encephalitis l: Introduction01:19

Encephalitis l: Introduction

Encephalitis is inflammation of the brain parenchyma, most often due to infections or autoimmune processes. It presents with neuropsychiatric features such as fever, altered mental status, behavioral changes, cognitive dysfunction, seizures, focal deficits, and sometimes autonomic instability. In some cases, the meninges are also involved, resulting in meningoencephalitis.Infectious CausesInfectious encephalitis is most commonly viral but can also result from bacterial, fungal, or parasitic...
Encephalitis ll: Pathophysiology01:26

Encephalitis ll: Pathophysiology

Encephalitis is inflammation of the brain parenchyma caused by direct viral invasion or immune-mediated mechanisms triggered by infections or tumors. Both processes lead to neuronal injury, disrupted neurotransmission, and diverse neurological symptoms, often with overlapping clinical and pathological features.Autoimmune EncephalitisIn autoimmune encephalitis, antibodies target neuronal antigens on cell surfaces, synapses, or within neurons. A key example is anti-NMDAR encephalitis, which can...
Effect of Hepatic Disease on Pharmacokinetics: Pathophysiologic Assessment and Liver Function Test01:22

Effect of Hepatic Disease on Pharmacokinetics: Pathophysiologic Assessment and Liver Function Test

In clinical practice, the direct measurement of hepatic blood flow to evaluate liver function presents significant challenges due to the intricate and specialized nature of the necessary techniques. Consequently, healthcare professionals often rely on empirical estimates derived from thorough patient examinations and liver function tests to gauge liver health. Among the tools at their disposal, the Child–Pugh and MELD scoring systems stand out for their ability to categorize and assess the...
Esophageal Varices-II: Clinical Features and Management01:28

Esophageal Varices-II: Clinical Features and Management

Esophageal varices often manifest as gastrointestinal bleeding episodes, presenting symptoms like hematemesis (vomiting of blood), hematochezia (passing fresh blood via the rectum), and melena (black, tarry stools). Other signs can include weight loss, anorexia, abdominal discomfort, jaundice, pruritus, altered mental status, and muscle cramps.
In the initial assessment, a thorough review of the patient's medical history is vital to identify risk factors such as liver disease, alcohol abuse, or...
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...

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A Piglet Model of Neonatal Hypoxic-Ischemic Encephalopathy
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Published on: May 16, 2015

Hepatic encephalopathy.

Juan Córdoba1, Beatriz Mínguez

  • 1Servei de Medicina Interna-Hepatologia, Hospital Vall d'Hebron, Departament de Medicina, Universitat Autònoma de Barcelona, Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas, Barcelona, Spain. jcordoba@vhebron.net

Seminars in Liver Disease
|February 23, 2008
PubMed
Summary
This summary is machine-generated.

Hepatic encephalopathy, a severe cirrhosis complication, involves ammonia. Skeletal muscle plays a key role in ammonia removal, impacting nutritional status and neurological function.

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Area of Science:

  • Hepatology and Neuroscience

Background:

  • Hepatic encephalopathy (HE) is a severe complication of cirrhosis.
  • Ammonia accumulation significantly contributes to HE pathogenesis, affecting neurotransmission and astrocyte function.
  • Oxidative stress and inflammation exacerbate brain disturbances in HE.

Purpose of the Study:

  • To analyze interorgan ammonia trafficking and its role in HE.
  • To review current assessment methods and therapeutic strategies for HE.
  • To discuss future directions in HE management.

Main Methods:

  • Analysis of interorgan ammonia transport, particularly skeletal muscle's role.
  • Review of diagnostic tools including clinical scales, neuropsychological tests, and neuroimaging.
  • Evaluation of existing therapeutic interventions and evidence-based practices.

Main Results:

  • Skeletal muscle is identified as a crucial site for ammonia removal.
  • Nutritional status is highlighted as a key factor influencing ammonia levels.
  • Current evidence does not support protein-restricted diets for HE management.

Conclusions:

  • Hepatic encephalopathy pathogenesis involves ammonia, oxidative stress, and inflammation.
  • Liver transplantation is a viable option for select HE patients.
  • Future research should focus on novel ammonia-lowering drugs, edema reduction, and liver support devices.