Haemotology Flashcards
Anaemia defenition
- Low RBC mass
- Increase plasma volume
eg: Pregnancy
What does reticulocyte count indicate
Low - production issue
High - removal issue
MCV classification
MCV <80 - Microcytic
MCV 80-100 - Normocytic
MCV >100 - Macrocytic
Microcytic anaemia causes
Iron deficiency
- hypochromic
Chronic disease
Thalassaemia
Normocytic anaemia causes
Acute blood loss
Chronic disease
Combined haemanitic def
- Querey malabsorption
Macrocytic anaemia causes
Vit B12 def
Alcohol/liver disease
Hyperthyroidism
Folic acid def
Reticulocytosis
FAT RBC MD
D- drugs
AZT/Phenytoin
Serum ferritin
Major iron storage protein in the body
- directly measure iron levels in the body
- Acute phase reactant so can be raised falsley in inflammand malignancy
Anaemia general presentation
Sx
- fatigue
- lethargy
- dyspnoea
- palpitations
- headache
Signs
- pale skin
- pale mucous membranes
- tachycardia (compensatory)
Iron deficiency causes
Poor diet - low iron Blood loss - Menorrhagia - GI bleeding - Hookworm Malabsorption - coeliac Pregnancy - increased requirements
Where is iron absorbed
Duodenum
*Coelaic disease - Inflamm and duodenal cell destruction
Iron deficiency anaemia signs
- Brittle hair and nails
- Atrophic glossitis
- Kolionychia
- Angular stomatitis
Iron deficiency anaemia investigations
- Serum ferritin
- Low serum ferritin confirms dx
- Acute phase reactant
- FBC
Hypochromic microcytic anaemia - Reticulocyte count
- Reduced
- Transferrin saturation
- LOW = Iron deficiency
HIGH = Iron overload - Coeliac serology
Iron deficiency anaemia tx
Ferrous sulphate S/E: - Black stools - Nausea - Constipation - Diarrhoea - GI upset - Abdo discomfort
*Take with OJ
Why should you take ferrous sulphate with OJ
Increases acidity - helps with absorption
What are the promoting factors for intestinal iron absorption
- Gastric acid
- Iron def
- Increase Erythropoeitc -activity
Anaemia of chronic disease
- Shortening of RBC
- RBC reduced cell production
CKD
RA
SLE
Cancer
Investigations for new iron def anaemia in an adult withhout a clear underlying cause
GI cancer investigations
- Oesophago-gastroduodenoscopy (OGD)
- Colonoscopy
What is the normal rise in iron levels for a pt recieving iron def anaemia tx
10 grams/ litre / week
Megaloblastic anaemia
B12 and folate
- Inhibition of DNA synthesis
- Continued growth without division
- Macrocytosis
What are megaloblasts
Erythroblasts with delayed nuclear maturation due to delayed DNA synthesis
Folate deficiency
- Anaemia
- Neural tube malformation
Folate sources
Green leafy veg - Spinach - Brocolli Liver Kidney
How long is the folate store in the body + where is it basorbed
4 months
Jejunum
Causes of folate def anaemia
- Poor folate diet
Alcohol
Poverty - Malabsorption
Coeliac
IBD - Crohns - Pregnancy
- Anti flolate drug
Methotrexate
Phenytoin - Haemolysis
- Malabsorption