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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,...
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,...
Toxidromes: Clinical Features01:30

Toxidromes: Clinical Features

Toxidromes are specific patterns of symptoms resulting from toxic substance exposure. They help in the identification and treatment of poisoning. The symptoms of each toxidrome group indicate poisoning by a certain class of chemicals or drugs.1. Sympathomimetic: Stimulates the sympathetic nervous system. Symptoms include agitation, increased heart rate (HR), blood pressure (BP), respiratory rate (RR), temperature, and pupil size. Drugs like cocaine and amphetamines, along with tremors and...
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...

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Related Experiment Video

Updated: Jun 3, 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

Toxic epidermal necrolysis. A case report.

Patricia Villalta1, Ines Velez, Lina Mejia

  • 1Nova Southeastern University, College of Dental Medicine, Florida 33328, USA.

The Journal of Clinical Pediatric Dentistry
|March 23, 2011
PubMed
Summary

Toxic Epidermal Necrolysis, a severe Stevens Johnson Syndrome variant, is a fatal immune reaction causing skin and mucosal blistering. This extreme case highlights severe complications like blindness and esophageal destruction.

Related Experiment Videos

Last Updated: Jun 3, 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

Area of Science:

  • Dermatology
  • Immunology
  • Toxicology

Background:

  • Stevens Johnson Syndrome (SJS) and Toxic Epidermal Necrolysis (TEN) are severe cutaneous adverse drug reactions.
  • TEN represents the most extreme form of SJS, characterized by extensive epidermal detachment.
  • These conditions are potentially fatal immune-mediated responses.

Observation:

  • The case presented is an extreme manifestation of TEN.
  • The reaction severely affected the skin and mucous membranes.
  • Extensive blistering and epithelial sloughing were observed.

Findings:

  • The patient experienced severe sequelae impacting multiple organ systems.
  • Documented complications included blindness, hearing loss, and dental malformations.
  • Significant esophageal damage, leading to destruction, was a critical finding.

Implications:

  • This case underscores the critical need for early recognition and management of TEN.
  • Understanding the severe sequelae is crucial for patient prognosis and long-term care planning.
  • Highlights the potential for devastating outcomes in severe immune reactions affecting the skin and mucosa.