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Allergic Reactions

Allergic Reactions

Asthma-II: Pathophysiology and Classification

Asthma-II: Pathophysiology and Classification

Asthma is a prevalent chronic respiratory condition marked by inflammation and hyperresponsiveness of the airways. Its pathophysiology involves complex interactions among inflammatory pathways, immune responses, and neural mechanisms.
Additionally, environmental and genetic factors play crucial roles in determining an individual's susceptibility to asthma and the severity of their condition.
Critical processes in asthma pathophysiology include:

Allergic Reactions: Anaphylaxis

Allergic Reactions: Anaphylaxis

Anaphylaxis is a severe, life-threatening hypersensitivity reaction mediated by Immunoglobulin E (IgE) antibodies. When IgE binds to allergens, it triggers the release of mediators– histamine, leukotrienes, and prostaglandins from mast cells and basophils. These mediators cause vasodilation, edema, and inflammation, leading to various symptoms.The primary allergens causing anaphylaxis include food items (e.g., peanuts, shellfish), drugs (e.g., penicillin, asparaginase, corticotropin, heparin),...

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...

Allergic Drug Reactions

Allergic Drug Reactions

Allergic reactions related to drugs are hypersensitivity responses driven by the immune system and bear no connection to the drug's therapeutic action. While drugs in isolation do not trigger an immune response, they can interact with endogenous proteins to form antigens. These antigens stimulate lymphocytes to produce antibodies. IgE-type antibodies attach themselves to mast cells. Upon subsequent exposure to the same stimulus, the antigen-antibody interaction is initiated, unleashing numerous...

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...

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Related Experiment Video

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Immunofluorescent Labeling in Nasal Mucosa Tissue Sections of Allergic Rhinitis Rats via Multicolor Immunoassay

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Monosensitization and polysensitization in allergic rhinitis.

Giorgio Ciprandi¹, Ignazio Cirillo

¹Department of Internal Medicine, University of Genoa, Genoa, Italy. gio.cip@libero.it

European Journal of Internal Medicine

|November 15, 2011

Summary

This summary is machine-generated.

Most allergic rhinitis (AR) patients are polysensitized, but 25.7% are monosensitized. Polysensitized patients experience more severe AR symptoms, with Parietaria allergy causing the most severe symptoms in monosensitized individuals.

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Area of Science:

Immunology
Allergology
Clinical Medicine

Background:

Polysensitization is frequent in allergic rhinitis (AR) patients and can influence clinical presentation.
A subset of AR patients remains monosensitized, necessitating further investigation into distinct characteristics.

Purpose of the Study:

To determine the prevalence of monosensitization and polysensitization in a large cohort of AR patients.
To compare the clinical features, including symptom severity and duration of AR, between monosensitized and polysensitized individuals.

Main Methods:

An observational, cross-sectional study involving 2415 AR patients.
Evaluation of symptom severity, type and number of allergen sensitizations, and duration of AR.

Main Results:

25.7% of patients (621) were monosensitized to specific allergens like Parietaria (377) and house dust mites (194).
Polysensitized patients reported significantly higher symptom severity compared to monosensitized patients (p<0.05).
Among monosensitized patients, Parietaria allergy was associated with the most severe symptoms.

Conclusions:

Monosensitized and polysensitized AR patients may represent distinct clinical categories.
The specific allergen sensitization profile can significantly impact the clinical manifestation of allergic rhinitis.