Dr. Singh - Hematopathology : RBC And Bleeding Disorders Flashcards
How to access for anemia
You look at Hemoglobin (12-16) or you look at Hematocrit (36%-48%)
For women ranges
How to measure the properties of RBCs
MCV(mean corpuscular volume) = Hct/RBC
MCH = Hgb/RBC
MCHC = Hgb/Hct
Low MCV
Microcytic Anemia
Volume of each cell is smaller
high MCV
Macrocyclic anemia
Volume of each RBC is larger
Low MCH
Hypochromic (lighter in color in middle is larger)
Low amounts of hemoglobin in each RBC
Polychromatic cells
What are they and how to confirm
They are Reticulocyte with a small RNA in them, they look more purple in color and slightly bigger then the RBCs
- confirm with supravital stain that stains the RNA inside it
Normal or low Reticulocytes seen and anemia
The BM has a problem and does not make more RBCs, RBCs have low Hcrit and Hgb
Anemia with many reticulocytes seen
There is a problem in the periphery causing the RBCs to not survive or function
BM produces more RBCs
Anisocytosis
Elevated RDW (distribution of size in RBCs) **** FE+3 deficiency anemia**** can cause this
Acute Blood Loss causes what to happen immediately and overtime
No difference in MHV and all other properties
- BP down, pulse up
OVERTIME :
- blood left pulls fluid from body = Hct and Hgb goes down (6-7hr later)
Chronic Blood loss
Very mild and gradual sx
- pt can come in with 5.5 hgb and feel fine due to body compensation
EX: heavy menstrual cycle, GI bleeds
Hemolytic Anemias what is it generally and 7 types
Peripheral destruction = high BM production of reticulocytes 1. G6PD deficiency 2. Hereditary Spherocytosis 3. Hemolytic anemia from trauma 4. Immunohemolytic anemia 5. Paroxysmal Npcturnal Hemoglobinuria 6. Sickle Cell 7. Thalassemia
Hereditary spherocytosis is what
Inherited mutation in RBC cytoskeleton spectrin
Small pieces on the plasma membrane bud off over time and makes the RBC small and round (small dark cell)
= high risk of hemolysis
Hereditary spherocytosis causes hemolytic anemia how
They are inflexible and unable to bend trough the vessels + MAINLY the spleen M eat them
= splenomegally + hypersplenism (many M made)
Hereditary spherocytosis TX
Take the spleen out
Hereditary spherocytosis on blood smear
Round and dark with no central pallor
Have Howell Jolly bodies if spleen is removed (DNA inclusions that the spleen normal removes) = a dot that is dark and small the RBCs
Hereditary spherocytosis SX
Anemia (normal MCH, high MCHC, low MCV)
Jaundice
Splenomegaly
Can be mild
Hereditary spherocytosis what can be life threatening
A Parvovirus B19 which attached Proerythrooblasts can cause an aplastic crisis, with extremely low RBCs extremely anemic
G6PD deficiency is transmitted how and in what populations usually
X- linked + homozygous carriers can have SXs
Sub-Saharan Africa
Mid East
Mediterranean
G6PD deficiency is what
G6PD makes NADPH which gives its electrons to make GSH (glutathione which is important to reduce free radicals)
G6PD deficiency causes hemolytic anemia how and when
When the conditions in body makes a lot of free radicals (a few days after, not immediately after:
- Stress
- Drugs (anti-malaria….)**
- Foods like favs beans (favism)
- Infections
Heinz bodies
Oxidative damaged proteins in the cells that climb together
Chopped out by the spleen
G6PD deficiency is found in the aftercare Middle East and Mediterranean for what reason
Protects them from Plasmodium falciparum infection
Sickle Cell Anemia is caused how
They have a B-chain mutation = HgS (normal HgA + HgB)
Mutation is GAG ——> GTG (Glu—> Val)
Sickle Cell Anemia Ss and SS and Ss
Heterozygous = SC trait
Homozygous SS = SC disease/anemia
Homozygous Ss = no SC
The populations that have a high chance of having Sickle Cell Anemia (HgS) can also be found to have what other hemoglobin modifications
- HgbC
2. B-thalassemia
Sickle Cell Anemia have RBCs that prefer and especially under what conditions
Polymerization
- Hypoxia
- ICF dehydration
- Low pH = low O2 affinity
- sluggy blood
Sickle Cell Anemia polymerization can cause what to happen
The polymerizartion causes hemolysis of the RBCs and that causes occlusion of small vessels causing more hypoxia in certain areas
Sickle Cell Anemia RBC 2 main properties
- Dense long polymer inside
2. Sticky surface from membrane damage
Sickle Cell Anemia SX
- Acute resp distress
- Acute chest syndrome
- Asymptomatic bone necrosis (marrow emboli can happen)
- Infarction of spleen (severe infection from capsular bacteria)
SC disease has what kind of hemoglobin
SS disease has what kind of hemoglobin
HgS + HgC = milder
HgS only = Sickle Cell Anemia
SC disease does what tho RBC
NO polymerization, the HgC crystallizes instead
They look like misshaped blobby RBCs (poikilocytes) + cells with pallor around the edge no in the center(Target cells)
Same risks and complications as SS only less severe
Sickle Cell Anemia TX
- Hydroxyurea : increase HgF
2. CRISPR gene editing
Thalassemia locations its found
Around Mediterranean Sea and some of Africa and Middle East
B- Thalassemia MAJOR what happens
The HgA aggregate and form clumps inside the RBCs (due to no normal HgB) + (hypochromic)
- Spleen hemolysis = hemolytic anemia
- Ineffective making of RBCs in BM = hemolysis in the BM (hypoproliferative)
- High Erythropoietin = BM expands
HgA and HgB are made from how many genes
A : 2 chr having 2 alleles = 4
B : 2 chr having 1 alleles = 2
B- Thalassemia is what
You can have 2HgA + 1 HgB = MINOR/ Trait
OR
2HgA + 0 HgB = MAJOR
Ineffective erythropoiesis can cause what to happen
- BM expands
2. Increased FE is taken into body = Fe overload (hyperchromatosis)
B- Thalassemia MINOR what happens
Mild Mycrocytic anemia (confused itch Fe deficient anemia)
Microcytic anemia from B- Thalassemia minor vs Fe deficiency
B-th Minor : high Ferritin, normal or high Fe levels, normal transferrin
Fe D: low ferritin, Transferrin, Fe levers
a- Thalassemia different types and severity
- aaaa = normal
- a*aaa= asymptomatic carrier
- aaaa= asymptomatic a-thal minor (mild microcytic anemia)
- aaa*a= HbH disease symptomatic and microcytic+hemolytic anemia, splenomegally)
- aaaa = fetal hydrops no life
a- Thalassemia with HbH disease what happens
Only 1 normal a-globin ——> you get 4HbB tetramer = HbH
It has highh affinity for O2 and cant deliver properly
= anemia and splenomegaly
a- Thalassemia with all 4 a-globins gone causes
Fetal hydrops = Hb Bart’s disease
- Rely on embryonic Hb that is BAD at delivering O2 = fetal hypoxia + anemia
- heart try’s to compensate = edema and effusion
- Liver and spleen try to compensate = enlarge
Paroxysmal Nocturnal Hemoglobinuria (PNH) happens how
RBC have CD55 + CD59 on membrane to —I complement
- Mutation in the PIGA gene = no CD55/59
- MAC complexes form on RBCs = blood urine
PNH is transferred how
Acquired on X-chr on hematopoietic stem cells so it effects all blood cells
= can lead to not just hemolytic anemia, however also WBCs involved can cause AML + MDS
PMS pt can also have
AML and MDS
PNH Sx
- Wake up and have blood in urine since at night blood pH lowers and MAC form more easily
- Thromboembolism (portal, cerebral, hepatic)
PNH TX
- Eculizamab ——I C5–>C5a
= prone to get Neisseria infection (esp Neisseria meningitis)
Immunohemolytic anemia can happen in what 3 ways
- Idiopathic = autoimmune hemolytic anemia
WARM Ab - Idiopathic = Chronic hemaggulutinin disease
COLD Ab - Mismatched blood transfusion (hemolytic D of newborn)
Coombs test : indirect and direct
I : test Ab in plasma
D : test Ag on RBCs
WARM hemolytic anemia
IgG : more active in hot temps
Bind to RBCs to opsonizing them in spleen or phagocytoced
- Autoimmune or drug related
COLD hemolytic anemia
IgM : stronger affinity at low temps
Usually on nose and fingertips (Raynaud phenomena)
IgM makes C3b opsonizing cells removed then by spleen and liver and BM
WARM Hemolytic Anemia looks like what on blood smear
Kinda like hereditary spherocytosis
Round dark small cells
(RBC have Ab damage and condenses the cell)
Hemolysis from RBC trauma
- Mechanically : prosthetic heart valve (causes laser cells that look similar to SS)
- Microangiopathic hemolytic anemia : DIC, TTP/HUS-> thrombosis