Immunology Flashcards
Type 1 hypersensitivity reaction =
IgE mediated
Example of type 1
Allergic reaction
Type 2 hypersensitivity reaction =
Antibody dependent
Example of type 2
Myasthenia gravis
Good pastures
Type 3 hypersensitivity reaction =
Immune complex
Example of type 3
Glomerulonephritis
Vasculitis
Type 4 hypersensitivity reaction =
T cell mediated
Example of type 4
TB
Type 5 hypersensitivity reaction =
Stimulus
How does histamine release cause shock
Capillary leak and oedema
Causes vasodilation
Loss of PVR
Symptoms and signs of anaphylaxis
Stridor Increased resp effort Wheeze Cyanosis Tachycardia Skin reaction - rash / itch Angioedema
Useful diagnostic test in anaphylaxis
triptase
Acute treatment in anaphylaxis
ABCDE Remove precipitant Alert anaesthetics Adrenaline IM 0.5mg Chlorphenamine Hydrocortisone IV fluids Nebs salbutamol for wheeze
Causes of lymphadenopathy
Malignancy - lymphoma / leukaemia
Infective - bacterial (TBV) / viral (EBV)
Sarcoid
RA
Amyloidosis
Lymphadenopathy as part of malignancy usually presents as?
Slow and painless
Painful lymph nodes associated with?
infection
Associated symptoms to consider with lymphadenopathy
Splenomegaly Fever B symptoms Rash Joint pain
Blood tests to investigate lymphadenopathy
FBC UandE LFT ESR Clotting AB screen Monospot test for EBV Viral serology
Imaging in lymphadenopathy
CXR - first line
consider US/ CT
Other tests for lympadenopathy
FNA
Excision biopsy
Consider BM aspirate for haematological malignancies
Causes of pruritus
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Blood disease - iron deficiency anaemia, polycythaemia Liver disease Infection / immunological Neoplasm Kidney Endocrine - hyper / hypoT, DM Dermatological and drugs
Associated symptoms to look for with pruritis
Rash Jaundice Anaemia Lethargy Weight loss
Examination in pruritus
Full skin exam
Abdo
Lymph exam
Tests in pruritus
Urine dip
FBC, UandEs, LFTs, TFTs, glucose
Sarcoidosis is =
Sarcoidosis is a multisystem disorder of unknown aetiology characterised by non-caseating granulomas.
Features of sarcoidosis
Rash (lupus like) Lympadenopathy Swinging pyrexia cough and SOB hypercalcaemia Arthalgia (acutely)