Emergency med Flashcards
deaths per year anaphylaxis
20
type of reaction anaphylaxis
type 1 hypersensitivity
type 1 hypersensitivity
1st exposure - Th2 cells primed, IL4 released causes B cells to switch IgM to IgE..bind to mast cells and basophils..sensitised to allergen
2nd exposure - IgE crosslinks and causes mast cell degranulation and release of mediators…vasodilation, bronchoconstriction, permeability of endothelium
triggers of anaphylaxis
drugs - abx, NSAIDS
injections
venom
food - shellfish, nuts, peanuts, eggs
exercise induced anaphylaxis
idiopathic
higher risk anaphylaxis
existing comorbidities - asthma, CVD
exposed to same allergen again - food triggers
increased severity anaphylaxis
exercise
fever
acute infection
premenstrual status
emotional stress
ddx anaphylaxis
life threatening asthma
septic shock
hereditary angioedema
vasovagal episode
adult and children >12 adrenaline
IM 500 micrograms
child 6-12 adrenaline
300 micrograms
6mths to 6yrs adrenaline
150 micrograms
<6mths adrenaline
100-150 micrograms
management anaphylaxis
give IM adrenaline very 5 mins until infusion started
A to E
Take a blood sample for mast cell tryptase testing immediately after starting treatment to support diagnosis
paeds - biphasic response can occur so must be admitted (within 72 hrs)
febrile seizure definition
“A seizure associated with a febrile illness not caused by an infection of the central nervous system, without previous neonatal seizures or a previous unprovoked seizure and not meeting the criteria for other acute symptomatic seizure, which occurs in children aged 6 months to 6 years”
most common neurological condition in paeds
febrile convulsions
risk factors febrile convulsions
pathophysiology unknown
family hx - twins tudies
viral infections (URTI, LRTI nad otitis media most common)
socio economic class
seasonal prevalence
zinc and iron deficiency
hx febrile seizure
> 38 degrees
6 mths to 6yrs
tonic-clonic seizure
constitional sx suggesting infection