Allergic Rhinitis, Asthma, COPD Flashcards
Exaggerated response to antigen
Hypersensitivity
Type of antigen that enters the body
Exogenous
Any substance that induces the immune system to produce antibodies against it
Antigen
Blood group antigen
Endogenous
Normal proteins or complexes that are recognised by the immune system of someone with an autoimmune condition
Auto-antigen
A type of antigen that produces abnormally vigorous immune response
Allergen
IgE mediated release of histamine, mast cells, and basophils
Type 1: Allergic reaction (immediate hypersensitivity)
Reaction within 1 hour
Type 1: Allergic reaction (immediate hypersensitivity)
Ex: Bee sting, latex allergy, medications (penicillin), urticaria, anaphylaxis, atopy
Type 1: Allergic reaction (immediate hypersensitivity)
Treatment for Anaphylaxis
Epinephrine
Genetic tendency to develop allergic diseases such as allergic rhinitis, asthma, and atopic dermatitis
Atopy
Allergic disease in atopy
Allergic rhinitis, asthma, atopic dermatitis
Involves IgG and IgM bound cell surface antigens
Type 2: Cytotoxic reaction
Hours to days rxn
Type 2: Cytotoxic reaction
Ex: Hemolytic reactions (bursting or destruction of RBC) with medications (ex. Sulfa drugs such as cotrimoxazole cause hemolytic anemia), graft rejections
Type 2: Cytotoxic reaction
Involves circulating IgG and IgM immune complex that deposits in post capillary venules
Type 3: Immune complex reaction
1-3 weeks rxn
Type 3: Immune complex reaction
Example: SLE, Serum sickness
Type 3: Immune complex reaction
Cell mediated immunity
Type 4: Delayed hypersensitivity
Mediated by T-cells rather than antibodies
Type 4: Delayed hypersensitivity
Example: Mantoux test
Type 4: Delayed hypersensitivity
Ex: nickel (cancerous) allergy, SJS, poison ivy
Type 4: Delayed hypersensitivity
Poison ivy due to Urushiol, can cause
Contact dermatitis
Involves inflammation of nasal mucous membranes in sensitized individuals when inhaled allergenic particles contact mucous membranes and elicit a response mediated by immunoglobulin E (IgE).
ALLERGIC RHINITIS