galvan Flashcards
anaemia is when haemoglobin is below what
120 in females and 130 in males
what is the normal response to anaemia
to make more blood cells (reticulocytosis )
describe reticulocytes
still have remnants of RNA, stain purple/deeper red, blood oil appears polychromatic and larger than average red cells
when will there be a low reticulocyte count
when there is decreased production
when might have anaemia but high reticulocyte count
bleeding or haemolysis
what murmur can be a sign of anaemia
systolic
reticulocyte assesses response of what
marrow
what anaemia is caused by deficient haemoglobin synthesis
microcytic
most common cause of microcytic anaemia
iron deficiency
in anaemia of chronic disease what is released and increases production of hepcidin. subsequently downregulating ferroportin
IL-6
what anaemia can be due to problems with porphyrin synthesis
sideroblastic
what has an excess iron build up in mitochondria due to failure to incorporate iron into haem
sideroblastic anaemia
acquired caused of sideroblastic anaemia
myelodysplastic syndrome, lead poisoning, alcohol excess
what are global deficiencies
Thalassaemia
circulating iron is bound to
transferrin
tissues that especially express transferrin receptors
erythroid marrow
what is increased in genetic haemochromatosis
% saturation of transferrin with iron (measures iron supply)
where is iron stored
in ferritin mainly in the liver
what is an indirect measure of storage iron
serum ferritin. Low ferritin means iron deficiency
what blocks ferroportin mediated release of iron
hepcidin
what falls when iron deficient erythropoiesis
MCV
what is koilonhcyia
spoon shaped nails
what reflects hypo chromic
MCH - mean corpuscular haemoglobin
microcytic is determine by
MCV
what is poikilocytosis
variation in shape of red cells
what is anisocytosis
variation in size of red blood cells
what correlates with total iron body stores
serum ferritin
improving gastric what can improve iron intake
gastric acidity
typically need iron supplements for how long to replenish stores
2-3 months
what anaemia has defective DNA synthesis
megaloblastic
characterised by the presence in the bone marrow of
erythroblasts
folate is found in what
leafy green vegetables
drugs that can cause folate deficiency
anticonvulsants
what is a megaloblast
abnormally large nucleated red cell precursor with an immature nucleus
what anaemias are characterised by a lack of red cells
megaloblastic
a macrocyte lacks what
nucleus
a megaloblast has what
immature nucleus
folate and B12 are absorbed where
folate - duodenum and jejunum
B12- ileum
source of B12
animal
what does fit B12 bind to
intrinsic factor
what glycoprotein transports fit B12
transcobalamin II
patients with what anaemia may appear mildly jaundiced
macrocytic
how might B12/folate deficiency present
like anaemia, weight loss, sore tongue, diarrhoea
blood film shows macrovalocytes and hypersegmented neutrophils (3-5 nuclear segments)
macrocytic anaemia
does low levels of B12 and folate in serum mean deficiency
no and normal levels may not always indicate it is normal
what antibodies are specific for macrocytic anaemia
anti intrinsic factor
in what anaemia do you need vitamin B12 injections for life
pernicious anaemia
causes of non megaloblastic macrocytosis WITH anaemia
alcohol, liver disease, hypothyroidism
what marrow failures are causes of macrocytosis without megaloblastic anaemias that are associated with anaemia
myelodysplasia, myeloma, anaplastic anaemia
what happens in spurious (false) macrocytosis
volume of the mature red cell is normal, but the MCV is measured as high
examples of when spurious macrocytosis may occur
reticulocytosis and cold agglutinins
thalassaemia have what inheritance pattern
recessive
having a thalassaemia trait is believed to confer some protection against what
falciparum malaria
consequence of alpha thalassaemia
microcytic hypochromic anaemia
how can you differ alpha thalassaemia trait from iron deficiency
in alpha thalassaemia the ferritin will be normal. in beta it can be normal or high but won’t be low
there is normally how many alpha genes
4
clinical features of thalassaemias
jaundice, fatigue and facial bone deformities
FBC in thalassaemias
microcytic hypochromic anaemia
what is needed to make the diagnoses in thalassaemias
genetic analysis
alpha genes are from what chromosome
16
mutations affecting Beta global synthesis are from what chromosome
11
what is diagnostic of beta thalassaemia minor trait
HbA2
blood film shows target cells and basophilic stippling
beta thalassaemia minor
blood film shows marked anisopoikilocytosis, target cells and nucleated RBCs
Beta thalassaemia major
management of severe thalassaemias
lifelong blood transfusions, splenectomy is an option particularly in those with HbH disease, bone marrow transplant( if carried out before complications develop)
biggest complication of thalassaemia
iron overload from transfusion becomes the main cause of mortality
iron overload from transfusion for thalassaemias can be prevented by
iron chelating agents eg desferrioxamine
what are sickle syndromes
group of genetic disorders that affect the structure of haemoglobin
the sickle beta is due to mutation on codon 6 that substitutes glutamine to
valine
clinical features of sickle cell
acute pain in hands and feet, acute chest syndrome, pulmonary hypertension, anaemia
bone marrow aplasia can occur in sickle syndrome and most commonly follows infection with
parvovirus B19
management of sickle crises
oxygen, fluids and analgesia. red cell exchange transfusion in severe crisis and antibiotics if evidence of infection
what prophylaxis for sickle cell
penicillin
what supplementation for long term management of sickle anaemia
folic acid
what can be given if severe sickle crises occur
hydroxycarbamide
is autoimmune haemolytic anaemia Coombs positive or negative
positive
do red blood cells have a mitochondria
no
extravascular haemolytic anaemia occurs where
spleen and liver
feature of haemolytic anaemia
anaemia, splenomegaly and jaundice
spherocytes suggest
membrane damage
heinz bodies
oxidative damage due to G6PD deficiency
first line mx for warm autoimmune haemolytic anaemia
prednisolone
which AIHA has IgM
cold
mx for cold AIHA
supportive. steroids not shown to have a benefit
what are schistocytes
fragments of RBCs