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AP 3 > Lecture 7 - Hypersensitivity Reactions > Flashcards

Lecture 7 - Hypersensitivity Reactions Flashcards

1
Q

what are the 4 basic types of hypersensitivity reactions?

A

type I: anaphylactic
type II: cytotoxic
type III: abnormal immune complex
type IV: delayed

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2
Q

what type of allergic reaction is the most common?

A

type 1 - anaphylactic

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3
Q

what could cause a type 2 allergic reaction?

A

incompatible blood transfusion (antibodies act on antigens in RBC = agglutination)

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4
Q

what could cause a type 3 allergic reaction?

A

formation of abnormal antigen-antibody complexes that become trapped in capillaries and damage them

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5
Q

when does a delayed (type 4) allergic reaction usually appear?

A

12-72 hours after antigen exposure

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AP 3 (11 decks)

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