ANEMIA OF ABNORMAL IRON METABOLISM P2 Flashcards
Common among hospitalized patients
- Chronic inflammatory condition: E.g.
-___________
-__________ (tuberculosis, HIV,
malignancies)
Rheumatoid arthritis
- Chronic infections
ETIOLOGY
- originally called ____________________
- BUT chronic blood loss is not part of this
- correct term: ____________________
- ___________ is the unifying factor
- central feature: SIDEROPENIA with abundant iron stores
- cause:
- IMPAIRED FERROKINETICS → IRON-RESTRICTED ERYTHROPOIESIS
- IMPAIRED ERYTHROPOIESIS
- SHORTENED RBC LIFE SPAN
ANEMIA OF CHRONIC DISEASE
ANEMIA OF CHRONIC INFLAMMATION
inflammation
SIDEROPENIA
IMPAIRED FERROKINETICS
-__________is an acute phase reactant
- produced by the liver during inflammation in response to _________
(produced by macrophages)
- increase Hepcidin → increase breakdown of Ferroportin →
decrease iron release in the blood
- Iron becomes less available to bacteria
- not harmful in acute periods BUT when hepcidin levels are
chronically high → diminished RBC production
Hepcidin
IL-6
what organ hepcidin - liver
_____________second iron-related acute phase reactant that
leads to anemia of chronic inflammation
- iron-binding protein in the granules of neutrophils
- higher avidity for iron than transferrin
- prevent phagocytized bacteria from using intracellular
iron for their metabolic processes
- provide protection for the phagocyte from oxidized iron
that forms when ROS are produced during phagocytosis
lactoferrin
Lactoferrin
during infection and inflammation → lactoferrin is
released into the blood and extracellular spaces with the
death of neutrophils → it will scavenge iron to prevent it
from making oxidative damage
- this makes Lactoferrin _______________
- Lactoferrin carry the iron and bind to macrophages and
liver cells where iron will be taken up and salvaged
ANTI-INFLAMMATORY
IMPAIRED FERROKINETICS
____________
- but due to high Hepcidin, cells cannot acquire iron directly
- erythroblasts do not have __________receptors
- results to__________________
- iron is abundant in storage BUT unavailable to
developing erythroblasts
- BM examination with iron stains: (+) iron in macrophages
but not in erythroblasts
= ___________________________
Lactoferrin
lactoferrin
Functional iron deficiency
IRON-RESTRICTED ERYTHROPOIESIS
DIMINISHED ERYTHROPOIESIS
- production of inflammatory cytokines
- macrophages: __________
- activated T-cell:_____________
- leads to:
- impairment of the proliferation of erythroid progenitor cells
- diminishes their response to EPO
- decrease production of EPO by the kidney
TNF-a, IL-1
IF-gamma
EPO and Erythropoiesis
- extracellular mechanism but without clear identification to date
- inflammation appears to increase production of hemophagocytic
macrophages
SHORTENED RBC LIFE SPAN
LABORATORY DIAGNOSIS
- _______ anemia
- HGB _______
- without ____________
-_____________, __________
- Coexisting iron-deficiency: _________, ____________-
- _______________, ________ in due to inflammatory condition
Mild anemia
HGB 8-10 g/dL
reticulocytosis
Normocytic, normochromic
Microcytic, hypochromic cells
leukocytosis and thrombocytosis
LABORATORY DIAGNOSIS
- Iron studies:
________________
_______________
_________________
__________________
_______________
low serum iron and TIBC
increase serum ferritin
increase Free Erythrocyte Protoporphyrin
Decrease Hemoglobin content of reticulocytes
Normal Serum transferrin receptor
LABORATORY DIAGNOSIS
- BM:
- _________________ consistent with the lack of
reticulocytes in the peripheral blood
- ____________: confirms abundant stores of iron in macrophages
but not in RBC precursor
- examination is usually not required in the dx evaluation
Hypoproliferation of the RBCs:
Prussian blue
DILEMMA
- IRON DEFICIENCY ANEMIA (IDA)
- Iron deficiency may be missed due to increase in ___________
levels associated with the inflammation
- serum ferritin values in the ___________ range are most equivocal
(may mean 2 things)
- verify coexistence of IDA and chronic inflamm by measuring the ______ in the serum.
- increase in IDA
- normal in anemia of chronic inflammation
__________________
- rise dramatically in IDA (high numerator)
- normal in anemia of chronic inflammation
serum ferritin
30-100 ng/mL
sTfRs
sTfRs / log ferritin
TREATMENT
-_______: can correct anemia of chronic inflammation
- need ____________________ because of the
presence of functional iron deficiency (Iron stores are
unavailable)
- costly treatment → only for selected patients
-____________________: best course of treatment
-__________________ are being investigated
EPO
IRON administration concurrently
Alleviation of underlying condition
Anti-Hepcidin therapies
Diseases that interfere with the
production of protoporphyrin →
ANEMIA (Protoporphyrin synthesis
review Chapter 7 Rodak’s)
- iron is abundant in the BM
- Prussian Blue stain: (+)
mitochondrial iron surrounding the
nucleus in erythroblasts awaiting
incorporation into heme
-__________________: hallmark of
the sideroblastic anemias
Ring (Ringed) Sideroblasts
Hereditary and
Acquired conditions
__________________
- pharmacologic
doses help
stimulate heme
synthesis
- cofactor in the
1st step of
porphyrin
synthesis
- Pyridoxine (Vit B12)