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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...
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Optical perception, or vision, is an extraordinary sense dependent on converting light signals received via the ocular organs. These organs, known as eyes, are securely positioned within the bony cavities of the skull, called orbits. The orbits serve a dual purpose: a protective shield for the ocular globes and a stable attachment point for the soft ocular tissues. The eye's external protective mechanisms include the eyelids, which are edged with lashes that act as a barrier against foreign...
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The human eye has a specialized microbiota that reflects its unique anatomical and immunological environment. This low-biomass microbial community predominantly colonizes the conjunctiva and eyelid margins, playing a vital role in ocular surface homeostasis and defense. Despite its proximity to the richly colonized facial skin, the ocular surface maintains a distinct microbial profile due to continuous mechanical and biochemical defense mechanisms.The conjunctival surface hosts fewer microbial...
Hypersensitivities01:30

Hypersensitivities

Hypersensitivity, also known as a hypersensitivity reaction or allergic reaction, is a condition where the body's immune system reacts abnormally to a foreign substance. Such substances, that cause hypersensitivity are referred to as an allergen, could be something typically harmless to most people, like pollen or certain foods.
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Related Experiment Video

Updated: Jun 12, 2026

Induction of Ocular Surface Inflammation and Collection of Involved Tissues
06:38

Induction of Ocular Surface Inflammation and Collection of Involved Tissues

Published on: August 4, 2022

Periorbital contact sensitization.

Lilla Landeck1, Peter C Schalock, Lynn A Baden

  • 1Department of Dermatology, Massachusetts General Hospital, Harvard Medical School, 55 Fruit Street, Boston, MA 02114, USA.

American Journal of Ophthalmology
|June 15, 2010
PubMed
Summary
This summary is machine-generated.

Allergic contact dermatitis is a frequent cause of periorbital dermatitis. Patch testing is recommended for patients with periorbital dermatitis to identify and avoid allergens.

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Published on: August 2, 2024

Area of Science:

  • Dermatology
  • Allergology

Background:

  • Periorbital dermatitis is a common dermatological condition.
  • Identifying the underlying causes, particularly allergic contact dermatitis, is crucial for effective management.

Purpose of the Study:

  • To determine the frequency and patterns of contact sensitization in patients diagnosed with periorbital dermatitis.
  • To compare sensitization patterns between patients with and without periorbital dermatitis.

Main Methods:

  • A retrospective cross-sectional study involving 1247 patients referred for patch testing over 17 years.
  • Patch tests were administered using standard and customized trays, with results read at 48 and 72 hours.
  • Data from 266 patients with periorbital dermatitis were compared to 981 controls.

Main Results:

  • The study identified a significant female predominance (87.6%) and a peak age group of 40-59 years (45.9%) among periorbital dermatitis patients.
  • Nickel (16.5%) and fragrance mix (13.2%) were the most common sensitizers.
  • Allergic contact dermatitis was confirmed in 50.8% of tested periorbital dermatitis patients, with no significant difference in sensitization patterns compared to controls.

Conclusions:

  • Allergic contact dermatitis is a prevalent cause of periorbital dermatitis.
  • Patch testing is a valuable diagnostic tool for identifying specific allergens in patients with suspected contact allergy.
  • Identifying and avoiding causative allergens is essential for managing periorbital dermatitis.