Haematology Flashcards
Aetiology of Acute Myeloblastic Leukaemia
Malignant proliferation of precursor myeloblasts in bone marrow
Risk factors for Acute Myeloblastic Leukaemia
Other haematological disorders, exposure to radiation, chemotherapy, Down’s syndrome, Neurofibromatosis, exposure to Benzene, increasing age
What is the most common Acute Leukaemia in adults?
Acute Myeloblastic Leukaemia
Presentation of Acute Myeloblastic Leukaemia
Anaemia, leukopenia (infections), thrombocytopenia (bleeding), infiltration of leukaemic cells (hepatosplenomegaly, gum hypertrophy)
Diagnosis of Acute Myeloblastic Leukaemia
Bone marrow- blast cells > 20% in blood/bone marrow
Management of Acute Myeloblastic Leukaemia
Supportive- fertility cryopreservation, blood products
Chemotherapy
Bone marrow transplant
Prognosis of Acute Myeloblastic Leukaemia
50% 5-year survival
What is Acute Lymphoblastic Leukaemia?
Malignant proliferation of lymphoblast precursor cells in bone marrow, mostly B cells
Lymphoblast precursor cells proliferate and replace normal cells of bone marrow- spill into peripheral circulation
What is the most common cancer in children?
Acute Lymphoblastic Leukaemia
What is the most common age of presentation of Acute Lymphoblastic Leukaemia?
Age 2-4 years
Presentation of Acute Lymphoblastic Leukaemia
Fatigue, dizziness, palpitations, bone and joint pain, infections, fever, splenomegaly, dyspnoea, thrombocytopenia, pallor, petechiae, lymphadenopathy
Diagnosis of Acute Lymphoblastic Leukaemia
Bone marrow- blast cells > 20% in blood/bone marrow
How is Acute Lymphoblastic Leukaemia classified?
Into B and T cells
Management of Acute Lymphoblastic Leukaemia
Chemotherapy/Radiotherapy, stem cell transplant
Prognosis of Acute Lymphoblastic Leukaemia
80% cured
What is Chronic Lymphoblastic Leukaemia?
Malignant proliferation of mature lymphocytes, usually B cells
Presentation of Chronic Lymphoblastic Leukaemia
Lymphocytosis in blood
Lymphadenopathy
Splenomegaly
Management of Chronic Lymphoblastic Leukaemia
Chemotherapy
What is Chronic Myeloid Leukaemia?
Proliferation of mature myeloid cells
- neutrophils, basophils, eosinophils
Which genetic mutation is linked to Chronic Myeloid Leukaemia?
Philadelphia chromosome t9;22 chromosomal translocation
–> tyrosine kinase activity
Management of Chronic Myeloid Leukaemia
Imatinib is a tyrosine kinase inhibitor
Cured by bone marrow transplant
Which age group is affected by Chronic Myeloid Leukaemia?
Middle aged to elderly
Where is lymphoma found?
Mostly in lymph nodes, but also in blood, bone marrow, spleen, liver
Aetiology of lymphoma
Cancer of lymphatic system- malignant growth of lymphocytes (WBCs)
Which age groups are affected by Hodgkin’s Lymphoma?
Young adults + Elderly
Presentation of Hodgkin’s Lymphoma
Painless lymphadenopathy, hepatosplenomegaly, B symptoms, anaemia
Lump in neck painful on alcohol consumption
Investigation of Hodgkin’s Lymphoma
Lymph node biopsy- Reed Sternberg cells
What is found on lymph node biopsy in Hodgkin’s Lymphoma?
Reed Sternberg cells
Management of Hodgkin’s Lymphoma
Stage 1-2a: short combo chemotherapy then radiotherapy
Stage 2a-4a: longer combo chemo
Relapse: high dose chemo then autologous bone marrow transplant
Rituximab: anti-CD20
Which group of people are most likely to get Non-Hodgkin’s Lymphoma?
Immunodeficient- drugs, HIV
How is Non-Hodgkin’s Lymphoma classified?
Cell of origin: T or B
Stage of lymphatic maturation- high grade or low grade
What are high grade Non-Hodgkin’s Lymphomas?
Diffuse large B cell lymphoma
Burkitt Lymphoma
What are low grade Non-Hodgkin’s Lymphomas?
Follicular Lymphoma
Splenic marginal zone lymphoma
Presentation of Non-Hodgkin’s Lymphoma
Painless superficial lymphadenopathy, B symptoms, pancytopenia
Extra-nodal disease: Gastric MALT, small bowel lymphomas, skin, bone, oropharynx, CNS, lung
Aetiology of Multiple Myeloma
Malignant proliferation of plasma cells in bone marrow
- B cells that produce Ig
- Bone marrow destruction + failure from infiltration
What is the spectrum of pre-malignant conditions for Multiple Myeloma?
MGUS (Monoclonal Gammopathy of Undetermined Significance)
- -> Asymptomatic Myeloma
- -> Multiple Myeloma
What is the peak age for Multiple Myeloma?
Age 70
How is Multiple Myeloma classified?
By antibody
Which is the most common type of Multiple Myeloma?
IgG
Features of Multiple Myeloma
CRAB:
- hyperCalcaemia due to bone resorption
- Renal failure- deposition of light chains in renal tubules
- Anaemia (normocytic)
- Bony lesions- pain or pathological fractures
X-ray findings in Multiple Myeloma
Lytic bone lesions eg pepper-pot skull
Vertebral collapse
Fractures
Osteoporosis
Management of Multiple Myeloma
Chemo then autologous bone marrow transplant Correct anaemia Fluids for renal failure Manage infection Analgesia/radiotherapy for bone pain
How are MGUS, Asymptomatic myeloma and Multiple myeloma differentiated?
MGUS: - <10% plasma cells - +ve monoclones - Asymptomatic Asymptomatic myeloma: - >10% plasma cells - +ve monoclones - Asymptomatic Multiple myeloma: - >10% plasma cells - +ve monoclones - Symptomatic
What is Systemic Sclerosis?
Autoimmune production of antibodies –> abnormalities in small blood vessels, fibrosis of skin and internal organs due to excessive collagen production and deposition, immune activation
Types of Systemic Sclerosis
Diffuse or Limited
Presentation of limited Systemic Sclerosis
CREST
- Calcinosis
- Raynaud’s
- oEsophageal dysmotility
- Sclerodactyly
- Telangiectasia
Which antibodies may be present in Systemic Sclerosis?
Anti-topoisomerase I
Anti-centromere (ACA) - limited
Anti-RNA polymerase III - diffuse
Management of Systemic Sclerosis
Symptomatic treatment
Immunotherapy- Methotrexate
Mechanism of action of Heparin
Binds to antithrombin + increases its activity, indirect thrombin inhibitor
How can Heparin be monitored?
APTT
How is LMW Heparin excreted?
Renally excreted
Mechanism of action of aspirin
COX inhibitor, inhibits thromboxane formation –> inhibits platelet aggregation
Mechanism of action of Clopidogrel
Inhibits ADP-induced platelet aggregation
Mechanism of action of Warfarin
Prevents synthesis of Factor 2, 7, 9, 10; antagonises vitamin K, prolongs PT
How can Warfarin be monitored?
INR- target 2-3
Also prolongs PT
How can Warfarin be reversed?
Vitamin K or FFP
What is target INR for somebody on Warfarin therapy?
2-3 (normal < 1)
Mechanism of action of DOACs
Direct Oral Anticoagulants
Anti-IIa and Anti-Xa inhibitors
- Rivaroxaban + Apixaban- Xa
- Dabigatran- direct thrombin inhibitor
How can DOACs be reversed?
Beriplex
Name the 4 blood groups
A, B, AB, O
What type of immunoglobulin crosses the placenta in rhesus disease?
IgG anti-D
What coagulation disorder does bleeding into muscles and joints suggest?
Haemophilia
How do mucocutaneous bleeding disorders present?
Easy bruising, prolonged bleeding, epistaxis, gum bleeding, GI blood loss
What is the function of Neutrophils?
Phagocytose and kill bacteria
What is the function of Monocytes?
Produced in bone marrow and enter tissues as macrophages, some become dendritic cells which present antigens to the immune system
What is the function of Basophils?
Migrate to tissues and become mast cells, contain granules of histamine, surface IgE
What is the function of Eosinophils?
Protection against parasites, role in inflammation and allergy
What is the function of Lymphocytes?
Immunity, generate antibodies against foreign antigen, some have memory –> vaccination
Risk factors for Arterial thrombosis
Smoking, hypertension, diabetes, obesity, stress, hyperlipidaemia
How does Arterial thrombosis present?
MI
CVA
PVD
Management of Arterial thrombosis
Thrombolytics- alteplase, streptokinase