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Immunopathological reaction type IV (delayed type). Cutaneous and mucous contact allergy. IgE mediated immunopathological reaction (type I, atopy). Allergens. Allergic diseases – causes, symptoms and diagnostics. Anaphylaxis (causes, symptoms and treatment). Examples of diseases based on immunopathological reaction type I. Treatment. Drug allergy.
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Mechanism of IgE–mediated reaction Type I – Allergy Allergen IgE bound to the surface of the mast cell Degranulation, mediator release +
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Allergic reaction IL-4 IL-5 Eosinophil IgE B T T Th2 APC Allergen T Th1 IFN- B IgG IL-12 IL-12 Th1/Th2 response
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Immunopathological reaction type IV (delayed type). Cutaneous and mucous contact allergy. IgE mediated immunopathological reaction (type I, atopy). Allergens. Allergic diseases – causes, symptoms and diagnostics. Anaphylaxis (causes, symptoms and treatment). Examples of diseases based on immunopathological reaction type I. Treatment. Drug allergy.
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Allergens Inhaled (airborne) Food Venoms Drugs
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Inhaled allergens seasonal perennial pollen molds mites animals birch grass mugwort ragweed EXAMPLES Alternaria Cladosporium Aspergillus Dermatophagoides pteronyssinus Dermatophagoides farinae cat dog
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Food allergens EXAMPLES cow s milk eggs vegetables, fruits, nuts fish, seafood aditives AGE
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Hymenoptera venom allergens EXAMPLES honey bee (bumble bee) wasp, yellow jacket (hornet)
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Drug allergens EXAMPLES penicillines, cephalosporines non-steroidal antiinflammatory drugs iodine contrast media local anesthetics peripheral myorelaxants latex ethylenoxid
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Diagnosis of allergy History Clinical examination Skin tests Specific IgE in the serum Provocation and elimination tests
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Immunopathological reaction type IV (delayed type). Cutaneous and mucous contact allergy. IgE mediated immunopathological reaction (type I, atopy). Allergens. Allergic diseases – causes, symptoms and diagnostics. Anaphylaxis (causes, symptoms and treatment). Examples of diseases based on immunopathological reaction type I. Treatment. Drug allergy.
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Anaphylaxis GradeSkinGI-tractRespiratory tract Cardiovascular system IItching, urticaria, flush, angioedema --- IIItching, urticaria, flush, angioedema Nausea, cramps Rhinorrhoea, dyspnea Tachycardia, arythmia, decrease of blood pressure IIIItching, urticaria, flush, angioedema DiarrhoeaLaryngeal oedema, bronchospasm Cardiovascular shock, faints IVItching, urticaria, flush, angioedema DiarrhoeaRespiratory arrest Cardial arrest
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Treatment of anaphylaxis Adrenaline / Epinephrine: l Intramuscular – in patients with clinical symptoms of shock, oedema of the airways and pronounced dyspnoea l Dosage in adults: 0.5 ml - 1:1000 dilution In case of necessity repeat every 5-10 minutes
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Immunopathological reaction type IV (delayed type). Cutaneous and mucous contact allergy. IgE mediated immunopathological reaction (type I, atopy). Allergens. Allergic diseases – causes, symptoms and diagnostics. Anaphylaxis (causes, symptoms and treatment). Examples of diseases based on immunopathological reaction type I. Treatment. Drug allergy.
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Atopic diseases l Allergic asthma is chronic inflammatory disease of the airways in which a wide variety of cells (mast cells. Eosinophils, TH2 lymphocytes) and mediators play a role. Atopic dermatitis Allergic rhinitis Allergic asthma Allergic rhinitis is affection of the nose (and ocular conjunctiva) caused by IgE-mediated inflammation of nasal mucosa after allergen exposure. Atopic dermatitis is inflammatory disease of the skin which is mediated by T cells and stimulated by IgE- dependent reactions. IgE mediated food allergy Allergy
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Treatment of allergic diseases Allergen avoidance Pharmacotherapy Specific immunotherapy
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Allergen avoidance Anti-mites beddings Pollen filters Stay in mountains during pollen season Animal avoidance
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Pharmacotherapy Antihistamines Corticosteroids Symptomathic treatment
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Specific immunotherapy Subcutaneous Sublingual
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APC IgE IL-4 IL-5 Allergic response Eosinophil Th2 B-cell + + Tr1 IL-10 TGF - - - + IT Th1 IgG IFN- B-cell IT - CD4 CD80/86 T cell Allergen TCR HLA CD28
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Immunopathological reaction type IV (delayed type). Cutaneous and mucous contact allergy. IgE mediated immunopathological reaction (type I, atopy). Allergens. Allergic diseases – causes, symptoms and diagnostics. Anaphylaxis (causes, symptoms and treatment). Examples of diseases based on immunopathological reaction type I. Treatment. Drug allergy.
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Definition – differential diagnosis l toxicity – high dose, disorder of metabolism or elimination of the drug l intolerance – sensitive individuals l idiosyncrazy - intolerance based on another defect l other side effects of the drug (Jarish - Herxheimer reaction, sy. Hoigne, alteration of enzyme function, candidasis, inhibition of histaminases,...) l symptoms of the current disease
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Type of the immunopathological reaction l IgE l cytotoxic reaction l immunocomplex reaction l delayed type of hypersensitivity
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IgE n PNC-barbiturates n ACTH -gelatine n insuline -opioids n latex-etylenoxide n myorelaxants
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Cytotoxic reaction l PNC, cephalosporines l rifampicine l alfametyldopa
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Immunocomplex reaction l PNC l streptomycine l cephalosporines l PAS l hydantoinates
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Delayed type of hypersensitivity l „para“ group - sulphonamides, procaine, PAS, azote colourants, prothazine, chlorpromazine l streptomycine l PNC
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Local anaesthetics l paraaminobenzoic acid esthers l amides
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Local anaesthetics - diff. dg. of adverse events l vasovagal syncope l surgical trauma l adverse effect of adrenaline l toxicity of administered drug l reaction to conservants (parabens, sulphites)
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Local anaestetics l Diagnostic procedures - skin tests – risk of false positivity - provocation test
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Latex allergy l Contact type - additives l Immediate type - Hev b1 - Hev b 10
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Latex allergy l Risk groups: - healthcare personal (surgeons 2-6%) - patients with repeated surgeries (children with spina bifida - 20-30%) l Risk factors - women - younger age - preexisting eczema - atopy
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Latex allergy l Triggers - gloves - drains - catheters - condoms l Immediate manifestation - urticaria, dyspnoea, tachycardia
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Latex allergy l Diagnosis - skin test - specific IgE in serum l Solution - hypoallergenic products (vinyl gloves etc.)
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Allergy to beta-lactam antibiotics l Penicillins: frequency - max. 4 - 5 % of administrations (less severe skin disorders) anaphylaxis <0,1 % l Cephalosporins: less frequent than in penicillins
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Manifestations l exanthemas, oedemas l anaphylaxis
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Risk factors l not atopy l not allergy to molds l i.v. administration
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