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Hypersensitivities

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.
Types of Hypersensitivities
Hypersensitivity reactions are categorized into four types: Type 1, Type 2, Type 3, and Type 4. Each type has a distinct mechanism...

Drug Toxicity: Allergic Reactions

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...

Hypoglycemia

Hypoglycemia

Hypoglycemia is a blood glucose level below 70 mg/dL. It commonly occurs in individuals using insulin or insulin-secreting drugs, but may also arise in non-diabetic conditions. People with type 1 diabetes are at the highest risk because they depend on exogenous insulin. People with type 2 diabetes are also at risk, especially when treated with insulin or medications such as sulfonylureas, which increase insulin release regardless of blood glucose levels. It develops when insulin levels exceed...

Hypersensitivity Reactions: Cytolytic Reactions

Hypersensitivity Reactions: Cytolytic Reactions

Type II hypersensitivity involves IgG and IgM antibodies targeting cell surface antigens, leading to cell destruction. This can occur through complement activation, antibody-dependent cell-mediated cytotoxicity (ADCC), or acting as opsonins for phagocytosis. When excessive, these reactions cause significant tissue damage.Drug-induced hemolytic anemia is a common example, where drugs like penicillin or cephalosporins bind to red blood cells, forming drug-protein complexes. These complexes...

Hypersensitivity Reactions: Immune-Complex Reactions

Hypersensitivity Reactions: Immune-Complex Reactions

Type III hypersensitivity reactions occur when antigen–antibody complexes form and activate the complement system. Normally, these complexes help the clearance of antigens by phagocytes and red blood cells. However, when large numbers of immune complexes are present, they can deposit in tissues—particularly in the walls of blood vessels—leading to inflammation and tissue injury. These deposits trigger complement activation and neutrophil recruitment, resulting in serum sickness, a systemic...

Insulin: Dosing Regimen and Adverse Effects

Insulin: Dosing Regimen and Adverse Effects

Insulin-replacement therapy usually includes both long-acting insulin (basal) and short-acting insulin (to cater to postprandial needs). In a diverse group of type 1 diabetes patients, the average daily insulin dose is typically 0.5-0.7 units/kg body weight. However, obese patients and pubertal adolescents may need more due to insulin resistance.
The basal dose constitutes about 40%-50% of the total daily dose, with the rest as premeal insulin. The mealtime insulin dose should mirror...

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Related Experiment Video

Updated: May 8, 2026

Improving IV Insulin Administration in a Community Hospital

Improving IV Insulin Administration in a Community Hospital

Published on: June 11, 2012

[Hypersensitivity reactions to insulin].

Martín Becerril-Ángeles¹, Cristina Moctezuma-Trejo, Francisco Espinosa-Larrañaga

¹Servicio de Alergia e InmunologÌa ClÌnica, Hospital de Especialidades Dr Antonio Fraga Mouret, Unidad MÈdica de Alta Especialidad, Centro MÈdico Nacional La Raza, IMSS, MÈxico, D.F. mbecer5@gmail.com.

Revista Alergia Mexico (Tecamachalco, Puebla, Mexico : 1993)

|September 7, 2013

Summary

This summary is machine-generated.

Insulin hypersensitivity, though rare, requires careful management. Understanding its types, diagnosis, and treatment ensures effective patient care and continued insulin therapy.

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Homogeneous Time-resolved Förster Resonance Energy Transfer-based Assay for Detection of Insulin Secretion

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Last Updated: May 8, 2026

Improving IV Insulin Administration in a Community Hospital

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Published on: June 11, 2012

Homogeneous Time-resolved Förster Resonance Energy Transfer-based Assay for Detection of Insulin Secretion

Homogeneous Time-resolved Förster Resonance Energy Transfer-based Assay for Detection of Insulin Secretion

Published on: May 10, 2018

Area of Science:

Immunology
Endocrinology
Pharmacology

Background:

Hypersensitivity reactions to insulin are uncommon but clinically significant.
These reactions can manifest through immune mechanisms of Type I, III, and IV hypersensitivity.
Understanding these mechanisms is crucial for diagnosis and management.

Purpose of the Study:

To elucidate the pathophysiology of insulin hypersensitivity.
To outline clinical features, diagnostic strategies, and therapeutic approaches.
To guide healthcare providers in managing insulin allergy and specialist referral.

Main Methods:

A comprehensive literature search was conducted on PubMed.
Relevant articles on insulin hypersensitivity were selected for review.
The review focused on pathophysiology, mechanisms, diagnosis, and treatment.

Main Results:

Thirty-eight papers were included, detailing pathophysiology and injury mechanisms.
Various insulin types involved in hypersensitivity reactions were analyzed.
Diagnostic criteria and treatment options, including specialist referral, were compiled.

Conclusions:

Insulin hypersensitivity presents with low prevalence and varied clinical symptoms.
Available insulin formulations allow for flexible and effective treatment continuation in most cases.
Proper diagnosis and management are key to overcoming hypersensitivity challenges.