Asthma, Allergy Flashcards
type of allergic reaction (immune mediated pathway) involved in hemolytic anemia
Type II
first line therapy for eczema
emollients and moisturizers
Type I hypersensitivity mediated by what?
IgE
What three things are released with Type I hypersensitivity
histamine, leukotriene, prostaglandin
histamine responsible for what?
bronchoconstriction, bronchial smooth muscle contraction vasodilation, local pain/pruritis (immediate)
leukotrienes responsible for what?
Powerful bronchoconstricton, sustains inflammation (more long term)
prostaglandins responsible for what?
smooth muscle constriction, inflamm. mediation
Types of type I HS reactions
atopic dermatitis urticaria allergic rhinitis anaphylaxis food allergies PCN allergy
Type II HS reactions involve what
antibody response
Type II HS mediated by
IgM, IgG, IgA
binds to patients own cells
What gets activated by type II reactions
complement pathway and B cell response
lysis of cells releases anaphylactoxins, which trigger mast cell degranulation
Examples of type II reactions
hemolytic anemia, thrombocytopenia, graves disease, rheumatic fever, myasthenia gravis, idiopathic thrombocytopenic purpura
type III reactions involve what
antigen-antibody complexes form (immune complex)
examples of type III HS reactions
serum sickness, Henoch-Schonlein purpura, post streptococcal glomerulonephritis, SLE
Type IV reactions involve what
cellular immune mediated or delayed hypersensitivity
In type IV sensitivity, what recognizes antigens?
sensitized T cells
This type of HS is usually seen with contact allergies, but can be autoimmune (DM I, hashimoto, MS, celiac disease)
type IV
Over 80% of patients with atopic dermatitis will develop these two things:
asthma and allergic rhinitis (ATOPIC TRIAD)
the majority of patients with atopic derm have elevated levels of this
IgE
Presence of atopic derm in young kids vs toddlers
younger- face, neck folds, EXTENSOR surfaces
older- FLEXOR lichenification
kid comes in with pruritic, erythematous papules with associated excoriations and vesiculations
atopic dermatitis
pt comes in with erythematous papules over groin and axillary, with linear lesions
scabies
kis comes in with yellow scales on the scalp that didnt itch
seborrheic dermatitis
kid comes in with coin shaped lesions
nummular eczema
treatment for atopic dermatitis
rehydration therapy: moisturizers and occlusives (emollients, ointments- NOT lotion)
topical corticosteroids: fluticasone, tacrolimus
what type of HS reaction can cause urticaria
type I HS
Raised, red, itchy lesions on the skin that often come and go and can coalesce together in to larger, red, itchy areas. Unlike other rashes, these come and go and move about the skin. Superficial dermis.
urticaria
edema extending into deep dermis or subcutaneous tissues
angioedema
Angioedema resolves faster than urticaria. T or F
False… Ang takes 72 hours, urticar takes 24 hours
serious complication of type I HS. Rapid onset, serious allergic reaction in a previously sensitized patient
anaphylaxis