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Related Concept Videos

Drug Toxicity: Allergic Reactions01:30

Drug Toxicity: Allergic Reactions

Drug-related allergies are immune-mediated responses triggered by the administration of pharmacological agents. These hypersensitivity reactions are classified based on the immune mechanisms involved. The four primary types—Type I, II, III, and IV—are mediated by different immunological pathways and exhibit distinct clinical manifestations.Type I Hypersensitivity/ IgE-Mediated Reactions: Immunoglobulin E (IgE) immediately mediates Type I hypersensitivity reactions. Upon initial exposure to a...
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,...
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...
Necrosis01:16

Necrosis

Necrosis is considered as an “accidental” or unexpected form of cell death that ends in cell lysis. The first noticeable mention of “necrosis” was in 1859 when Rudolf Virchow used this term to describe advanced tissue breakdown in his compilation titled “Cell Pathology”.
Morphological Manifestations of Necrosis
Necrotic cells show different types of morphological appearance depending on the type of tissue and infection. In coagulative necrosis, cells become anucleated and die, but their...
Cellular Injury IV: Necrosis01:16

Cellular Injury IV: Necrosis

Necrosis is a form of irreversible cell death caused by severe injury such as ischemia, toxins, or trauma. Unlike programmed cell death, it is an uncontrolled, pathological process that typically provokes inflammation in surrounding tissues.Pathophysiologic ChangesNecrosis begins when cells sustain critical damage, leading to swelling of organelles, particularly mitochondria, and rapid ATP depletion. As energy levels decline, membrane ion pumps fail, leading to calcium influx and eventually,...
Prevention of Further Absorption of Poison01:14

Prevention of Further Absorption of Poison

In cases of acute poisoning, the primary objective is to prevent further absorption of the toxic substance into the body. Immediate interventions using various decontamination techniques targeting the gastrointestinal (GI) tract can achieve this. Decontamination is crucial to prevent poison from entering the systemic circulation, which involves washing affected areas with water and mild soap and removing contaminated clothing. Once external decontamination is done, attention must be turned to...

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Related Experiment Video

Updated: May 20, 2026

A Standardized Procedure of Dressing Management for Toxic Epidermal Necrolysis
07:22

A Standardized Procedure of Dressing Management for Toxic Epidermal Necrolysis

Published on: March 14, 2025

Ocular involvement in toxic epidermal necrolysis.

J Palmares1, O Correia, L Delgado

  • 1Departments of Ophthalmology, Oporto, Portugal.

Ocular Immunology and Inflammation
|July 26, 2012
PubMed
Summary

Toxic epidermal necrolysis (TEN) causes severe skin and mucosal damage, frequently affecting the eyes. Survivors often experience chronic ocular complications, significantly impacting their long-term health and quality of life.

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Evaluating Therapeutic and Chemical Toxicity Using Organ-Cultured Porcine Corneas and Epithelial Wound Healing
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Last Updated: May 20, 2026

A Standardized Procedure of Dressing Management for Toxic Epidermal Necrolysis
07:22

A Standardized Procedure of Dressing Management for Toxic Epidermal Necrolysis

Published on: March 14, 2025

Evaluating Therapeutic and Chemical Toxicity Using Organ-Cultured Porcine Corneas and Epithelial Wound Healing
03:57

Evaluating Therapeutic and Chemical Toxicity Using Organ-Cultured Porcine Corneas and Epithelial Wound Healing

Published on: January 10, 2025

Area of Science:

  • Ophthalmology
  • Dermatology
  • Immunology

Background:

  • Toxic epidermal necrolysis (TEN), also known as Lyell's syndrome, is a severe, life-threatening condition often triggered by adverse drug reactions or infections.
  • It is characterized by extensive epidermal detachment and significant mucosal membrane involvement.
  • The underlying pathophysiology is not fully understood but is thought to involve immune-mediated processes.

Purpose of the Study:

  • To review the ocular manifestations in patients diagnosed with drug-induced TEN.
  • To analyze the acute and chronic ocular complications in a cohort of TEN patients.
  • To assess the long-term impact of ocular involvement on patient morbidity.

Main Methods:

  • Retrospective review of ten cases of drug-induced TEN over a four-year period.
  • Detailed analysis of ocular findings during both the acute and chronic phases of the disease.
  • Correlation of ocular involvement with the extent of epidermal loss and systemic disease severity.

Main Results:

  • All ten patients exhibited ocular involvement, with varying degrees of epidermal loss (24-95% body surface area).
  • Acute ocular findings included conjunctivitis, inflammatory membranes, punctate epithelial keratitis, and corneal ulcers.
  • Chronic complications observed in survivors comprised keratoconjunctivitis sicca, symblepharon, entropion with trichiasis, and corneal neovascularization.

Conclusions:

  • Ocular involvement is a near-universal complication of drug-induced TEN.
  • Survivors of TEN frequently experience persistent ocular issues, contributing substantially to their overall morbidity.
  • Early recognition and management of ocular complications are crucial for improving long-term outcomes in TEN patients.