Haematology_Medicine Flashcards
Anaemia - cause categorization? Ix? Deficiency-related anaemia - causes & relevant deficiencies?
Hb normal range: 130-175
MCV normal range: 82-98
Categorization:
- MICROcytic - IDA, thalassaemia, anaemia of chr disease (can be normocytic)
- NORMOcytic - acute bleed, aplastic anaemia, mixed anaemia (micro & macro)
- MACROcytic - B12/folate def, alcohol excess, haemolytic anaemia
Ix: FBC
- Microcytic - haematinics (Fe profile), Hb electrophoresis (thalassemia/SCD Dx)
- Macrocytic - B12, folate, DAT test (AI haemolytic anaemia Dx)
Deficiency-related anaemia:
- Poor dietary intake - Fe, B12, folate
- Malabsorption (IBD) - Fe, B12
- Pernicious anaemia (AI parietal cell destruction -> don’t prod intrinsic factor -> escorts B12 to terminal ileum for absorption) - B12
- Crohn’s disease (most common in terminal ileum where B12 is absorbed) - B12
- Bleeding (GI, menstrual) - Fe
Haem malignancies - Types?
Types:
- Leukemia
- Lymphoid
- Acute (ALL) - child, TdT+ve
- Can have BCR-ABL1, t(9;22)
- Chronic (CLL) - smear/smudge cells, IgH UNmutated = worse prognosis, 17p gene deletion
- Acute (ALL) - child, TdT+ve
- Myeloid
- Acute (AML) - Auer rods, MPO expression pattern
- Chronic (CML) - Basophils, Philadelphia chromosome (BCR-ABL1, t(9;22)), left shift
- Lymphoid
- Lymphoma
- Hodgkin
- Non-Hodgkin
- Other
- Myeloma
- Myelofibrosis
- Myelodysplasia
- Polycythaemia Vera
Leukaemia vs Lymphoma?
Blood cell dev? How does this relate to Leukemia?
Lymphoma types? Staging?
Leukemia vs Lymphoma:
- Same disease - characterised by abn prolif of lymphocytes
- Different location:
- Leukemia - blood & BM
- Lymphoma - LNs
Blood cell development & leukemia:
- Physiology:
- Differentiation (gene expression, morphology & cell function change –> mature cells right @end)
- Proliferation (number of cells increase)
- Acute - abn differentiation (not mature) + excessive proliferation –> acute onset, excessive blast cells, likely Sx (BM failure - anaemia, recurrent inf)
- Chronic - normal differentiation (mature) + excessive proliferation –> mature cells, can be asymptomatic
Lymphoma
- Hodgkin - B-cell only, single group of LNs, Reed-Sternberg cells (multinucleated lymphocytes)
- Non-Hodgkin - 90% lymphomas, B/T-cell, multiple groups of LNs
- Common features: painless lymphadenopathy, B-Sx, pruritis
- NOTE: type ultimately determined by LN biopsy
- Staging: Ann-Arbor staging
- I: 1 site, 1-side of diaphragm
- II: 2+ sites, 1-side of diaphragm
- III: Both sides of diaphragm
- IV: BM/splenic/solid organ involvement
- NOTE: stage classified as A/B – based on presence of B symptoms (fever>38, night sweats, unintentional >10% weight loss in 6 months – FLAWS)
Multiple myeloma - def? pathophysiology? Spectrum of disease? Ix? Dx? Mx?
Def: cancer of plasma cells –> excessive monoclonal Ig prod
- Plasma cell dyscrasia (humoral immune dysfunction) – clonal plasma cell population –> proliferate –> monoclonal Ig light chains (in blood = paraprotein, in urine = Bence Jones protein)
-
Pathophysiology:
- Normally e.g. 5 different types of plasma cells produce 5 different types of Ig
- In MM - one type of plasma cell outcompetes the others so lots of 1 type of Ig produced
Spectrum of disease:
-
Multiple Myeloma:
- >1 focal lesion on MRI
- BM plasma cells >60%
-
End organ damage (1+ of CRAB(S)):
-
Calcium (>2.75) - high: lytic bone lesions –> release Ca into circulation
- NOTE: stones, bones, abdo groans, thrones, psychiatric overtones
- Renal (from excess Ig) – creatinine clearance <40ml/min OR creatinine >177
- Anaemia (Hb <100g/l) - BM supression
- Bone lesions (lytic)
- Signs of amyloidosis – damage from misfolded protein prod
-
Calcium (>2.75) - high: lytic bone lesions –> release Ca into circulation
-
Smouldering/asymptomatic myeloma
- Serum monoclonal protein >3g/dL
- BM plasma cells 10-60% in marrow
- NO end-organ damage (CRABS) BUT most progress to MM untreated
-
Monoclonal gammopathy of unknown significance (MGUS)
- Serum monoclonal protein <3g/dL
- Plasma cells <10% in BM
- No end-organ damage (CRABS)
- NOTE: 1-2% progress to MM, very common in elderly (if low risk – yearly bloods)
Dx: plasma cells on BF + Rouleaux cells
Ix: ESR, Ca, U&E, serum & urine electrophoresis (to identify an excess of one type of Ig = 1 large band)
- Electrophoresis (spike in gamma region, isolated IgG Kappa):
- Normally polyclonal bands, in myeloma = monoclonal band
- CD138= diagnostic
Mx:
-
MM:
- Young –> chemo followed by autologous SCT
- Old –> chemo followed by maintenance therapy
- Smouldering myeloma – treat
- MGUS – annual blood test
Microcytic anaemia + GI features - Ix? Mx?
Ix:
- IDA + lower GI features –> 2WW for colonscopy
- IDA + dyspepsia –> 2WW OGD (oesopho-gastro-duodenoscopy)
Microcytic anaemia, disproportionately low MCV - Dx?
Thalassaemia
Normocytic anaemia, reduced renal function - Dx?
CKD-related renal function (EPO)
Macrocytic anaemia + mixed upper/lower motor signs - Dx?
B12 def –> subacute combined degeneration of spinal cord
CML Mx? CML chromosome? How to identify if in accelerated (blast) phase? Dx?
Tyrosine kinase inhibitor e.g. Imatinib
BCR-ABL1, t(9;22)
≥20% blasts, Basophils ≥20%, progressive splenomegaly
Dx: blood film/BM aspiration, definitive = cytogenetic analysis
Auer rods - Dx?
AML
DIC & t(15;17) - Dx?
Acute promyelocytic leukaemia
Haemophilia A Mx? Haemophilia A vs B? vWD difference?
A = factor 8
B = factor 9
vWD - bleeding time prolonged because platelet dysfunction
Haemophilia - bleeding time not prolonged because no platelet dysfunction
Menorrhagia + prolonged bleed time - Dx?
vWD
Low platelets + low fibrinogen?
DIC
Raised INR, low Pl, deranged LFTs - Dx?
Liver cirrhosis
Haem malignancy buzzwords
ALL - Testicular swelling, 3-5yrs
AML - Auer rods
CML - Philadelphia chr, t(9;22), BCR-ABL1, left shift
- Tx: Imatinib (BCR-ABL tyrosine kinase inhibitor)
CLL - Smear/smudge cells
Polycythaemia vera - JAK2 mut, high haematocrit, flushed appearance, strokes/budd chiari
Essential thrombocythemia - High platelets, strokes, ± JAK2 mut
Myelofibrosis - Dry tap, teardrop cells (poikilocytes), massive splenomegaly
Hodgkin’s lymphoma - Painful LNs w/ alcohol, Reed-Sternberg cells, EBV
Follicular lymphoma - t(14;18), centroblasts
Mantle cell lymphoma - t(11;14), mantle cells
Burkitt’s lymphoma - t(8;14), starry sky appearance, EBV, HIV
Myeloma - CRAB, bence jones protein, IgG/A >30
MGUS - NO CRAB, paraprotein <30