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hypersensitivity rxn
First Aid hypersensitivity rxns
disorder | hypersensitivity rxn type |
---|---|
anaphylaxis | I |
allergic rhinitis (hay fever) | I |
asthma | I |
eczema | I |
hemolytic anemia | II |
ITP | II |
erythroblastosis fetalis | II |
RF | II |
Goodpasture's | II |
bullous pemphigoid | II |
Grave's | II |
MG | II |
SLE | III |
RA | III |
polyarteritis nodosum | III |
post-strep GN | III |
serum sickness | III |
arthus rxn | III |
hypersensitivity pneumonitis | III |
DM type I | IV |
MS | IV |
Guillain-Barre syndrome | IV |
Hashimoto's | IV |
graft-vs-host dz | IV |
PPD | IV |
contact dermatitis | IV |
IgE mediated - free Ag cross-links IgE on presensitized mast cells and basophils --> trigger release of vasoactive amines | I |
Ab mediated - IgM, IgG bind fixed Ag on enemy cell --> lysis by complement or phagocytosis | II |
immune complex mediated - Ag-Ab complex activates complement --> attract neutrophils --> neutrophils release lysosomal enzymes | III |
delayed (T-cell) mediated - sensitized T lymphocytes encounter Ag --> release lymphokines --> macrophage activation | IV |