Anemia Due to Hemolysis Flashcards
Hemolysis is defined as __________.
decreased RBC survival or an increase in RBC turnover beyond the normal range
RBCs can survive in blood for _________.
120 days (+/- 20 days)
Marrow production can increase by ______.
6-8 fold
List five cellular processes associated with normal turnover.
- decreased enzyme activity
- changes in calcium balance
- oxidative injury
- changes in membrane surface constituents
- antibodies attaching to membrane surface
What lab values are typically elevated in hemolytic anemia?
- reticulocyte count
- serum/urine hemoglobin
- bilirubin (unconjugated)
- methemalbumin
- LDH, SGOT (“housekeeping enzymes”)
What is the most common molecular abnormality in hereditary spherocytosis?
Spectrin deficiency
Hereditary spherocytosis presents with _______.
anemia, intermittent jaundice, splenomegaly, and responsiveness to splenectomy
Other than spectrin deficiency, spherocytosis can also be caused by _________.
ankyrin and band 3 defects
Familial spherocytosis is transmitted in a _________.
dominant (75%) and recessive (25%) manner
Conjugated hyperbilirubinemia results from ________.
liver damage
Aplastic crisis is _________.
the temporary cessation of RBC production (which is markedly worse in patients with sickle cell)
Genetically, glucose-6-phosphate dehydrogenase deficiency is _______.
an X-linked recessive disorder
G6PD is involved in the ______ pathway, which produces NADPH that then leads to ________.
pentose; glutathione production–important for production against oxidative damage
In autoimmune hemolytic anemia, ______ causes intravascular hemolysis and _____ causes extravascular hemolysis.
IgM; IgG
Splenic hemolysis is referred to as _______.
extravascular