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Related Concept Videos

Toxic Reactions: Overview01:26

Toxic Reactions: Overview

When toxic substances penetrate the human body, they disseminate to various tissues, undergoing metabolic changes. This process yields reactive metabolites that may covalently bind with specific target molecules, resulting in toxicity.
Toxicity falls into two primary categories: local and systemic.
Local toxicity appears at the exposure site, such as protein denaturation caused by caustic substances.
In contrast, systemic toxicity requires the toxic agent's absorption and distribution,...
Local Anesthetics: Adverse Effects01:12

Local Anesthetics: Adverse Effects

While local anesthetics are generally safe and well-tolerated, they can occasionally cause adverse effects that vary in severity. Local anesthetics can induce toxicity at two distinct levels. They can either produce local effects through direct contact with the neural elements or be absorbed into the bloodstream from the injection site, leading to systemic effects.
Once absorbed into the systemic circulation, local anesthetics can affect the organs that depend on the functioning of sodium...
Botulism01:22

Botulism

Botulism is a life-threatening neuroparalytic condition caused by botulinum neurotoxin, which is produced by the bacterium Clostridium botulinum, a Gram-positive, spore-forming, obligate anaerobe.In adults, the toxin enters the body in different ways: in foodborne botulism, the preformed toxin is absorbed in the intestine. In wound botulism, spores grow in injured tissue and release the toxin into the blood. Infant botulism differs mechanistically from adult forms. In infants, botulism commonly...
Acute Coronary Syndrome I: Introduction01:30

Acute Coronary Syndrome I: Introduction

Acute Coronary Syndrome (ACS) encompasses a spectrum of heart conditions caused by sudden obstruction of coronary arteries, typically resulting from the rupture of an atherosclerotic plaque and subsequent thrombus (blood clot) formation. This obstruction can lead to partial or complete blockage of blood flow, causing varying degrees of myocardial ischemia or infarction.ACS includes the following clinical entities:Unstable Angina (UA)Non-ST-Elevation Myocardial Infarction (NSTEMI)ST-Elevation...
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...
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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Related Experiment Video

Updated: Jun 5, 2026

Anterior Segment Organ Culture Platform for Tracking Open Globe Injuries and Therapeutic Performance
07:27

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Published on: August 25, 2021

[Toxic anterior segment syndrome].

P-L Cornut1, C Chiquet

  • 1Service d'ophtalmologie, hôpital Édouard-Herriot, CHU de Lyon, hospices civils de Lyon, université Claude-Bernard Lyon I, 5, place d'Arsonval, 69437 Lyon cedex, France.

Journal Francais D'Ophtalmologie
|December 24, 2010
PubMed
Summary
This summary is machine-generated.

Toxic anterior segment syndrome (TASS) is acute sterile inflammation after eye surgery, mimicking infection. Prompt diagnosis and steroid treatment are crucial to prevent vision loss from corneal edema or glaucoma.

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Area of Science:

  • Ophthalmology
  • Surgical Complications
  • Inflammation

Context:

  • Toxic anterior segment syndrome (TASS) presents as acute sterile inflammation post-anterior segment surgery.
  • It mimics infectious endophthalmitis, occurring 12-72 hours after procedures like cataract extraction.
  • Severe anterior segment inflammation, hypopyon, and corneal edema are characteristic findings.

Purpose:

  • To define Toxic anterior segment syndrome (TASS) as a sterile, non-infectious postoperative inflammation.
  • To identify potential causes and clinical features of TASS.
  • To differentiate TASS from infectious endophthalmitis and outline management strategies.

Summary:

  • TASS results from non-infectious substances entering the anterior segment during surgery.
  • Potential causes include preservatives, denatured ophthalmic viscosurgical devices, bacterial endotoxin, and intraocular lens-induced inflammation.
  • Diagnosis is often based on clinical presentation, as bacteria are not isolated; treatment involves local steroids.

Impact:

  • Early diagnosis and treatment with steroids can improve outcomes.
  • Untreated or severe TASS can lead to chronic elevated intraocular pressure or irreversible corneal damage.
  • Understanding TASS etiology is vital for preventing sight-threatening complications in anterior segment surgery.