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ACTIVE LEARNING TEMPLATE: System Disorder STUDENT NAME DISORDER/DISEASE PROCESS Contact dermatitis REVIEW MODULE CHAPTER Alte
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#. Contact Dermatitis

Definition: Rash due to direct skin exposure to a substance

-Classified as allergic contact dermatitis or irritant contact dermatitis

-distance from systemic effects due to drug or allergen sensitivities

#. Pathophysiology of Contact Dermatitis

-type IV hypersensitivity reaction involving T cells

-First exposure: immune system sensitized to antigen that is presented to APC in epidermis and carried to naive T cells. Takes 10-14 days

-Re-exposure: Antigen presented to sensitized lymphocytes and it releases cytokines that activate inflammation, destroying cells along with antigen. Takes 12-48 hrs

#. Common Triggers of Contact Dermatitis (Antigens)

-Plant oleoresin (ex poison ivy, oak, and sumac (sometimes mango)

-nickel in jewerly

-formaldehyde (clothing, nail polish)

-tape adhesives

-fragrances, preservatives

-antibiotic ointment (Neomycin in Neosporin)

-Latex (less common now than in 80s)

#. Acute Presentation Allergic Contact Dermatitis

-Acute exposure: one exposure and a few days later get a rash

-Usually able to identify a triggering exposure

ex. pulled weeds at house

-Intensely pruritic or burning rash with vesciles, wet, crusty, weepy

#..Chronic Presentation Allergic Contact Dermatitis

-Chronic exposure: exposed on a daily basis, and evolves more slowly

-belly ring or belt buckle for example

-More difficult to elicit trigger from history with chronic because most often an ongoing exposure

-Still intensely pruritic but scalin, red, and thickened (lichenified)

#. Diagnostic Tests for Contact Dermatitis

-Diagnosed on basis of history and physical (what it looks like &distribution). Another clinical diagnosis

-If you think it is contact dermatitis, treat it as such and hope it gets better

-Usually rash gets better so more testing is not usually necessary

-If rash does not get better, can do more testing if needed:

-Epicutaneous patch testing- take a bunch of common antigens & put on skin see if get a rash

-daily diary to track possible exposures

#. Complications :-

Infection

Cellulitis

Neurodermatitis

Decreased quality of life

#. Health promotion and prevention methods / client education :-

- avoid irritants and substances that cause allergies

- use of proper clothes , gloves etc

- avoid moisture buildup

- compliance to medications

- maintaining hygiene

#. Medications :-

Topical and oral corticosteroid

Antihistamines

Analgesics

#. Nursing care :-

- Teach patient how to maintain hygiene

- Teach patient the importance of compliance to medications and how to have the medications

- Advise patient to avoid irritants and substances that cause allergies

- Assisst in diagnostic procedure

- Provide psychological and emotional to the patient

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