Haematology Flashcards
What are the 4 components of blood?
erythrothcytes (red blood cells)
thrombocytes (platelets)
leukocytes (neutrophils, eosinophils, basophils, lymphocytes, monocytes)
plasma (water, proteins, clotting factors, electrocytes, CO2, O2)
What is meant by the term haematocrit?
volume percentage of red blood cells
What is meant by the term haematopoiesis?
the production of red blood cells in the bone marrow
Haematopoiesis regulation depends on glycoprotein growth factors, which drive the proliferation and differentiation of 5 progenitor cells such as?
erythropoietin (production of red blood cells) thrombopoietin (production of platelets) interleukins colony-stimulating factors negative regulators
Multipotent haematopoietic stem cells (HSCs) are able to differentiate into?
myeloid and lymphoid cell lines
Lymphoid progenitor cells give rise to which 3 cell types?
- B-lymphocytes
- T-lymphocytes
- natural killer cells
B-lymphocytes give rise to which cell types?
plasma cells
Myeloid progenitor cells give rise to which 3 cell types?
- megakaryocyte
- erythroblast
- myeloblast
Megakaryocyte cells give rise to which cell types?
platelets
Erythroblasts give rise to which cell types?
- reticulocyte
- red blood cells
Myeloblast cells give rise to which 4 cell types?
- monocytes
- neutrophils
- basophils
- eosinophils
What is the term used to describe the following process?
- low oxygen level in the body due to; hypoxia, decreased O2 availability to the blood, increased O2 demand from the tissues
- kidneys then secrete hormone erythropoietin
- erythropoietin stimulates enhanced erythropoiesis in the bone marrow
- RESULT: increased red blood cell count
erythropoiesis
What are 2 elements needed for erythropoiesis to take place?
- iron
- B12/folate
Which cell type is being described?
- biconcave shape
- no nucleus
- rich in haemoglobin (iron-containing protein)
- primary function is gas exchange
- lifespan of 120 days
erythrocytes (red blood cells)
Each haemoglobin is made of 4 subunits; ??
2 alpha globin chains
2 beta globin chains
What is the name of the graph that shows the following?
shows how the hemoglobin saturation with oxygen (SO2,), is related to the partial pressure of oxygen in the blood (PO2)
oxygen dissociation curve
What is the name of the condition being described?
- decreased number of red blood cells, haemoglobin or ability to carry oxygen
- CAUSES; blood loss, impaired red blood cell production, increased red blood cell destruction
- haemoglobin <130g/L (male), <120g/L (female)
anaemia
What are the following symptoms of?
- eyes: yellowing or in severe cases redness
- skin: paleness, coldness, yellowing
- respiratory: shortness of breath
- muscular: weakness
- fatigue, dizziness, fainting
- heart: low blood pressure, chest pain, increased heart rate
- spleen: enlargement
anaemia
What are the 3 sub categories of anaemia?
- microcytic anaemia
- normocytic anaemia
- macrocytic anaemia
Which type of anaemia is being described?
- MCV 80-100 fL
- total haemoglobin and haematocrit reduced, red blood cell size remains normal
reticulocyte count low:
anaemia of chronic disease
aplastic anaemia
reticulocyte count normal:
acute haemorrhage
haemolytic anaemia
normocytic anaemia
Which type of normocytic anaemia is the following?
- common syndrome in which the anaemia is due to an inflammation mediated reduction in red blood cell production and sometimes red blood cell survival
- caused by: infection, neoplasms, autoimmune reactions and trauma
anaemia of chronic disease
Which type of normocytic anaemia is the following?
- HSC in bone marrow are damaged - pancytopenia
- bruising, more prone to infections, clotting issues
- caused by: chemicals, drugs, radiation, infection, autoimmune disease
aplastic anaemia
Which type of normocytic anaemia is the following?
- premature destruction of red blood cells, rate of destruction greater than the rate of production
- jaundice
- caused by: autoantibodies, medications and underlying malignancy
haemolytic anaemia
Which type of normocytic anaemia is the following?
- as a result of trauma blood loss
- put into 4 classes
acute haemorrhage
What are the 2 main types of microcytic anaemia (MCV <80 fL)?
- iron deficiency
- thalassaemia
What are 4 predisposing factors of iron deficiency anaemia?
- pregnancy
- Afro Caribbean women
- vegan diet
- obesity
What are 3 causes of iron deficiency anaemia?
- decreased intake (inadequate diet, impaired absorption)
- increased requirement (pregnancy, lactation, growth)
- blood loss (GI bleeding, heavy menstrual bleeding)
What are 6 symptoms of iron deficiency anaemia?
- fatigue
- koilonychia (spoon nails)
- hair loss
- angular stomatitis
- glossitis
- PICA (start to eat non food items)
What are 2 treatment options for iron deficiency anaemia?
- oral supplementation
- red cell transfusion
Which type of microcytic anaemia is the following?
- inherited erythropoiesis disorder - abnormal haemoglobin production
- type depends on which globin chain is abnormal: alpha and beta
- inherited in recessive fashion
- most common in Italian, greek, Middle Eastern, south asian and African ethnicity
thalassemia
What are 10 symptoms of thalassaemia?
- lethargy
- enlargement of spleen or liver
- jaundice
- failure to thrive
- low height/weight
- pallor (pale)
- spinal deformity
- large head
- chipmunk faces
- misaligned teeth
What are 5 treatment options for thalassaemia?
- genetic counselling
- transfusion if symptomatic
- iron chelation
- splenectomy
- stem cell transplant if only cure
What are 4 complications of thalassaemia?
- skin pigmentation
- thrombotic compilations
- cardiovascular complications
- oestopaenia
Which type of anaemia is the following?
- inhibition of DNA synthesis during erythropoiesis - cell therefore has prolonged growth phase of cell cycle - large cell
macrocytic anaemia (MCV > 100 fL)
What are the 3 main causes of macrocytic anaemia?
- B12/folate deficiency
- hypothyroidism
- alcoholism
What are the 2 types of macrocytic anaemia?
megaloblast
and
non-megaloblast
Which type of macrocytic anaemia are the following causes of?
- B12 deficiency (pernicious anaemia)
- folate deficiency (eg. dietary insufficiency)
megaloblast
Which type of macrocytic anaemia are the following causes of?
- alcohol
- reticulocytosis
- liver disease
- hypothyroidism
non-megaloblast
Which type of macrocytic anaemia is the following?
- caused by autosomal recessive gene defect in the beta chain of haemoglobin which results in production of sickle cell haemoglobin
sickle cell anaemia
What are 6 symptoms of sickle cell anaemia?
- fever
- jaundice
- bone pain
- pneumonia like symptom
- tachycardia
- maxillary hypertrophy with overbite
What are 5 treatment options for sickle cell anaemia?
- blood transfusion
- bone marrow transplant
- antibiotics
- antihistamine
- analgesia
What are 5 precipitating factors (trigger) of sickle cell anaemia?
- acidosis
- dehydration
- cold temperatures
- extreme exercise
- stress & infection
What are 5 complications of sickle cell anaemia?
- iron overload
- leg ulcers
- blindness
- gallstones
- cardiovascular manifestations
What is the definition of haemostasis?
the physiological process that stops bleeding at the site of an injury while maintaining normal blood flow elsewhere in the circulation
What are the 3 stages of haemostasis?
- vascular reaction
- platelet aggregation (primary haemostasis)
- coagulation cascade (secondary haemostasis)
What stage of haemostasis is the following?
- injury to a blood vessel triggers local sympathetic nervous reaction
- vascular smooth muscle cells constrict
- vasospasm occurs
- blood flow to injured area reduced
- endothelin release causes vasoconstriction
- serotonin, ADP and thromboxane released from recruited platelets to enhance vasoconstriction
- reflex constriction of neighbouring arterioles
vascular reaction
Which cell type is the following?
- does not have a nucleus
- derived from megakaryocyte
- circulating lifespan of 10 days
- without injury - do not adhere to each other or endothelium
platelets ‘thrombocytes’
Which stage of haemostasis is the following?
- platelets adhere to exposed endothelial materials eg. collagen and von Willebrand factor
- vWF in endothelium binds to platelet glycoprotein Gplb
- vWF binding exposes Gpllb/llla sites
- Gpllb and Gpllla link with counterparts on other platelets via vWF
platelet aggregation