Haematology Flashcards
(218 cards)
What is acute lymphoblastic leukaemia?
malignant clonal proliferation of lymphoblastic cells (most commonly B cells)
What is the most common childhood cancer?
ALL
what age range is ALL most common in ?
<20 => children
bimodal age peaks - 4-5 year and 50+
What are 4 risk factors for ALL?
Age (child, 50+)
genetics
Hx of malignancy
Down’s (AML more common)
what is the pathophysiology of ALL?
Genetic mutations => uncontrolled proliferation and clonal expansion of lymphoid progenitor cells => leukemic blasts infiltrate the bone marrow and other organs, which disrupts their normal function.
CNS involvement common
What are 6 manifestations of ALL?
lymphadenopathy hepatosplenomegally fever, fatigue, pallor dizziness, palpitations, SOB bleeding - anaemia, infection, epistaxis, bruising, petechia bone/abdo pain
what are 3 investigations for ALL?
FBC with differential - anaemia, leukocytosis, neutropenia, thrombocytopenia
Peripheral blood smear - leukaemia lymphoblasts
immunophenotyping
what is the gold standard investigation for ALL/AML?
bone marrow aspiration and biopsy
>20% lymphoblasts/myeloblasts in bone marrow is diagnostic
what are 3 differentials for Leukaemias?
meningococcal septicaemia
idiopathic thrombocytopenia purpura
vasculitis
what is the treatment for ALL?
Chemo - vincristine + corticosteroids
imatinib - if Philadelphia +ve
mercaptopurine + methotrexate => 2 years maintenance
bone marrow transplant
What are 3 complications of ALL?
stunted growth and development in children
tumour lysis syndrome
infertility
What is acute myeloid leukaemia?
the clonal expansion of myeloid blasts in the bone marrow, peripheral blood, or extramedullary tissues.
what age group is AML more common in?
anywhere about 45 - most common 65+
what are 5 risk factors for AML?
65+ previous chemo/radiation Down's syndrome benzene - painters, petroleum, rubber myelodysplastic/proliferative syndromes
what is the pathophysiology of AML?
Accumulation of myeloid blasts unable to differentiate into mature neutrophils, RBCs or platelets resulting in bone marrow failure
what are 6 presentations of AML?
pallor bruising (ecchymoses + petechia) and bleeding infections lymphadenopathy hepatosplenomegaly fatigue, dizziness, palpitations bone/abdo pain
what are 3 investigations of AML?
FBC with differential - anaemia, macrocytosis, leukocytosis, neutropenia, thrombocytopenia
peripheral blood smear - blasts, Auer rods
coagulation pannel - may be normal, if abnormal suspect DIC
what is the treatment of AML?
Chemo - cytarabine and an anthracycline (tretinoin)
All-trans retinoid acid
stem cell transplant
what are 3 complications of AML?
tumour lysis syndrome
Disseminated intravascular coagulation (DIC)
infection
what is the prognosis for AML?
high incidence of relapse
5 year survival - 25%
what is reticulocyte count?
measure of immature RBCs
shows if production or removal is cause of anaemia
What are 5 causes of microcytic anaemia?
TAILS
Thalassaemia Anaemia of chronic disease Iron deficiency Lead Poisoning Sideroblastic anaemia
what are 5 causes of normocytic anaemia?
AAAHH
Acute blood loss Anaemia of chronic disease Aplastic anaemia - CKD, bone marrow suppression Haemolytic anaemia Hypothyroidism
what are 7 causes of macrocytic anaemias?
Megaloblastic:
B12/folate deficiency
Normoblastic: alcohol reticulocytosis - haemolytic anaemia/blood loss Hypothyroidism liver disease drugs