acd by aseem
DESCRIPTION
TRANSCRIPT
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ALLERGIC CONTACT DERMATITIS (ACD)
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INTRODUCTION• Von Pirquet (1906) - Gk: ‘Allos’ = Other ; ‘Ergon’ – Work
• 1840 - Dakin Dermatitis Venenata / Rhus dermatitis
• Bloch / Steiner-Worlich Allergic Sensitization of skin (Primula sp)
• Haxthausen (1942) ‘Allergy stems from within’
• Landsteiner / Chase (1949) Cell-mediated hypersensitivity reaction to HAPTENS
• Staedler (1847) – Blotting paper patch test ; modified by Jadassohn – Dermatitis Medicamentosa
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DEFINITION
• type of contact dermatitis
• Delayed cell-mediated HSN
• manifestation of an allergic response
• contact with an exogenous substance
• previous sensitization
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EPIDEMIOLOGY
• 3700 documented allergens
• Children > Adults
• Females > Males ? Ni ? Fragnance Mix
• Males : 10-19 % Occupational (44% - Hand Dermatitis)
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ETIOPATHOGENESIS
• Type IV HSN• T-cell mediated Inflammation to Haptens• Genetic Susceptibility HLA alleles to Co / Ni / Cr• Sensitization (Induction) – Elicitation –
Resolution• Hapten + Epidermal Carrier Protein (LC) =
Contact Allergen• Contact Allergen conjugate recognized by LC
Presented to T-cells• Internalized to LNs LCs differentiate into DCs
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PATHOGENESIS
• AA
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CLINICAL FEATURES
• A
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• ACUTE : pruritic papules and vesicles on an erythematous base Erosions , crusting
• Edema in areas of higher absorption coefficient – Mucosae / Eyelids / Genitals
• CHRONIC : Lichenified pruritic plaques , scaling
• Initial Site localization – causal
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REGIONAL DISTRIBUTION
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ACUTE ACD
10
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ACUTE ACD
11
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CHR ACD
12
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VARIANTS• Mucosae - Contact Aphthae / Lingual erosions / Peri-
anal dermatitis ; more in Geriatric group Poor hygeine , incontinence , mucosal dryness
• PARADOXICAL ACDWeak allergens -
Contact / Damaged Epidermis
Gold on Metal OxidesParaben / Lanolin EczemaTopical Corticosteroids
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• Eythroderma / Exfoliative Dermatitis
• EM – Ni / Poison Ivy / Hair dye / Neomycin
• Non-Eczematous : Contact Purpura / Contact Leucoderma / Lichenoid AC Reactions / Erythema Dyschromia Perstans
• Allergic Contact Urticaria (ACU) – IgE ; Latex Rubber / Colophony / Bacitracin
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• Systemic Eczematization (Immunological Memory + Secondary Systemic Exposure)
• ACD SYNDROME
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DDx
• aa
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DDx
• a
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DIAGNOSIS
• DETAILED HISTORY
• CLINICAL EXAM / REGIONAL ALGORITHM
• PATCH TESTING +/- ROAT
• SPOT TESTS (DIMETHYLGLOXAMINE TEST)
• HISTOPATHOLOGY
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PATCH TESTING (IN-VIVO)
• ISS (Indian Standard Series)
• TRUE (Thin-layer Rapid Use ; Epicutaneous)
• Other Series (Plant / Food / Vegetable / Fragnance / Cosmetic / Textile)
‘Gold Standard’
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INTERPRETATION
• − (0) Negative reaction • ?+ Doubtful reaction; erythema only • + (1+) Weak (nonvesicular) positive allergic
reaction; erythema, infiltration and possibly papules
• ++ (2+) Strong (vesicular) positive allergic reaction; erythema, infiltration, papules and vesicles
• +++ (3+) Extreme positive allergic reaction; bullous reaction
• IR Irritant reaction
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PATCH TESTING (IN-VITRO)
• LEUKOCYTE TRANSFORMATION INHIBITION
• MACROPHAGE MIGRATION INHIBITION
• LYMPH NODE ASSAY
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HPE
• Spongiosis
• Eosinophillic Folliculitis
• Microvesicle formation
• Perivascular infiltrate in Dermis ; granuloma formation noted
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MANAGEMENT
• PHARMACOTHERAPY
– Aluminium Sulfate / Calcium Acetate– Emollients– Topical Antipruritic agents– Antihistaminics– Corticosteroids (topical / Oral)– Calcineurin Inhibitors (topical / Oral)
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PHOTOTHERAPY
P-UVANBUVB
PREVENTION
?? HYPOSENSITIZATION / TOLERANCE INDUCTION
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THANK YOU