Hematology Flashcards
MC cause of iron deficiency in the US?
Chronic blood loss
MC cause of iron deficiency in the world?
diet
Sx of iron defiency?
pic, pagophagia, koilonychia, glossitis, angular cheilitis, pallor
CBC seen in iron deficiency?
microcytic hypochromic anemia
Iron study seen in iron deficiency anemia?
decreased ferritin
decreased serum iron
increased TIBC
Txt for iron deficiency anemia?
ferrous sulfate
Adv effects of iron?
constipation, GI, dark stools
Txt for severe iron deficiency anemia
RBC transfusion
MC cause of B12 deficiency?
pernicious anemia
Who are at risk for B12 deficiency?
vegans, chronic alcoholics
Sx of B12 defiency?
neurologic abnormalities
MC initial sx of B12 deficiency?
symmetric paresthesias
Blood smear for B12 defiency?
macrocytic anemia, hypersegmented neurtophils
What can be used to distinguish B12 deficiency from folate?
increased methylmalonic acid, neurologic sx
Txt for B12 deficiency?
oral, IM cynaobalamin
Txt for B12 deficiency due to pernicious anemia?
lifelong monthly IM B12 injections
Where is B12 absorbed?
distal ileum
What is needed for B12 absorption?
intrinsic factor
What cells make intrinsic factor?
parietal cells
MC cause of folate deficiency?
inadequate intake
Sx of folate deficiency?
no neurologic abnormalities, normal methylmalonic acid
Txt for folate deficiency?
oral folic acid
CBC seen in anemia of chronic dx?
normocytic normochromic anemia
Iron studies seen in chronic anemia?
normal or increased ferritin
decreased TIBC
decreased serum iron
Txt for anemia of chronic dx?
treat underlying cause
erthyropoietin alpha if renal dx
Sickle cell trait is what type of genetic disorder?
autosomal recessive
Sx of pts w/ sickle cell trait?
asymptomatic. May develop sx if exposed to factors
Dx of sickle cell?
hemoglobin electrophoresis
Txt for sickle cell trait?
none
MC presenting sx of sickle cell dx?
dactylitis
Pts with sickle cell dx are at risk for?
infection w/ encapsulated organisms
Osteomyeltis
Stroke
MC organism in patients w/ sickle cell dx?
Salmonella spp.
Dx of sickle cell dx?
peripheral smear
What is seen on peripheral smear for sickle cell dx?
Howell-jolly bodies, target cell, sickled erythrocytes
What is seen on hemoglobin electrophoresis for sickle cell dx?
HbS, little to no HbA, increased HbF
What is the definitive dx for sickle cell dx?
DNA analysis
Txt for sickle cell dx?
IV hydration and oxygen
Med for sickle cell dx?
Hydroxyurea
Definitive cure for sickle cell?
bone marrow transplant
What supplement is need in sickle cell dx?
folic acid
What drug reduces the frequency and severity of pain episodes and prolongs survival in sickle cell dx?
Hydroxyurea
Adverse effects of Hydroxyurea?
Myelosupression, GI upset
What is the prophylactic for sickle cell dx?
Penicillin given at 2-3 mo till 5yrs
Pneumococcal and influenza vaccine
What’s the problem in Thrombotic thrombocytopenic purpura?
ADAMTS13 deficiency
Pentad seen in Thrombotic thrombocytopenic purpura?
Fever Anemia Thrombocytopenia Renal failure Neuro sx