Heme Flashcards
Iron Deficiency Anemia cause
↓ iron -> impaired hemoglobin production -> bone marrow pumps out small and pale RBC -> ↓ O2 to tissue -> ↑ BM activation -> ↑ poikilocytosis (shape) and anisocytosis (size) -> defective mitochondrial enzymes
Chronic bleeding (cancer, menses, h pylori, hookworms, etc)
Malnutrition
Absorption disorders
Gastrectomy/surgery
Pregnancy, childhood
Iron Deficency Anemia diagnosis
- Serum iron level decreased
- Total iron-binding capacity increased
- Percentage transferrin saturation decreased
- Serum ferritin level decreased or normal
- Platelet count increased
- Reticulocyte count decreased
- FEP increased
- Peripheral blood smear
- Mentzer index >13
- Microcytic hypochromic RBC
- Basophilic stippling
- Howell-jolly bodies (if severe)
Iron Deficiency Anemia comp
Plummer-Vinson syndrome (triad of IDA, esophageal webs, dysphagia)
Glossitis
Iron Deficiency Anemia clinical
Fatigue, conjunctival pallor, palpitation, pica, spoon nails (koilonychia), SOB, hair loss
a-Thalassemia cause
Cis or trans deletion on chromosome that results in absent/reduced alpha globin chains
a-globin gene deletions on chromo 16, decreased a-globin synthesis
autosomal recessive
a-Thalassemia RF
Cis deletion - Asian populations
Trans deletion - African populations
areas of high incidence of malaria
a-Thalassemia comp
chronic tissue hypoxia, leg ulcers, high output heart failure, hypermetabolic state, gallstones, bone marrow hyperplasia, bone marrow widens structural malformations, iron deposition in liver, myocardium, pancreas, and kidney
a-Thalassemia sx
Feeling tired or weak
Shortness of breath
Paleness
Dizziness and fainting
Headaches
Pale skin or yellowing of the skin and eyes (jaundice)
A large abdomen from a spleen or liver that is larger than normal
Changes or problems with bones in the face
Dark urine
Poor appetite
Intellectual or developmental disabilities
Lead Poisoning-Related Anemia RF
contaminated water, lead paint, industrial emissions (smelters, refiners, battery manufacturing, recycling) , lead-glazed ceramics
Lead Poisoning-Related Anemia comp
developmental delays, learning difficulties, chronic kidney disease, HTN, low libido, infertility, SIADH,
Lead Poisoning-Related Anemia clinical
fatigue, dyspnea, activity intolerance, abdominal pain, headache, difficulty concentrating, muscle/joint pain, confusion, ataxia
Lead anemia DX
heavy metal testing
CBC
Lead Poisoning-Related Anemia clinical
fatigue, dyspnea, activity intolerance, abdominal pain, headache, difficulty concentrating, muscle/joint pain, confusion, ataxia
Beta Thalassemia cause
mutation in beta globins
1: carrier
2: mild anemia
Beta Thalassemia comp
chronic tissue hypoxia, leg ulcers, high output heart failure, hypermetabolic state, gallstones, bone marrow hyperplasia, bone marrow widens structural malformations, iron deposition in liver, myocardium, pancreas, and kidney
Beta Thalassemia RF
FH, Mediterranean, middle eastern, southeast Asian, African genetic descent
Alpha thalassemia diagnosis
Microcytic
Basophilic stippling
Heinz’s bodies
Serum iron increased or normal
TIBC decreased or normal
Percentage saturation increased
Ferritin increased or normal
Reticulocyte increased or decreased
Serum LDH increased or normal
Haptoglobin decreased
Mentzer Index (Ratio of MCV/RBC) <13
Beta Thalassemia DX
- CBC
- microcytic anemia
- target cells
- inc RBCS
- Hemoglobin electrophoresis with hemoglobin F and A2 quantitation
- Mentzer index <13
Autoimmune Hemolytic Anemia path
Warm: IgG to Rh on RBC at normal body temp, antibody fixes complement + binds to RBC membrane -> antibody-coated RBCs destroyed extravascular by macrophages in spleen, liver
Cold: IgM, I, i, P
antibodies activate direct complement system attack, intravascular, complement-mediated
Autoimmune Hemolytic Anemia RF
immune deficiencies, malignancies, certain drugs, measles, varicella, mycoplasma, H. influenza, lymphoproliferative disorders, autoimmune disorders, exposure to cold
Autoimmune Hemolytic Anemia comp
venous thromboembolism, cholelithiasis, renal insufficiency, cardiac comp (older)
Autoimmune Hemolytic Anemia clinical
pallor, fatigue, activity intolerance, bounding pulses, tachycardia, pulmonary congestion,
cold: hemoglobinuria, jaundice, pain in legs and back, anemia, acrocyanosis, Raynaud’s, anemia after infx
Autoimmune hemolytic anemia dx
- High ferritin
- TIBC normal
- Reticulocyte count low
- CBC
- Normocytic/microcytic
- Normochromic/ hypochromic
- Low serum iron
Glucose-6-Phosphate Dehydrogenase Deficiency path
inadequate G6PD, GSH -> oxidative stress -> build-up of free radicals, peroxides -> precipitation of hemoglobin -> disruption of cell membrane -> ↑ cellular rigidity -> extravascular hemolysis, accelerated removal of damaged RBCs by reticuloendothelial system in spleen; intravascular hemolysis may also occur
G6PD deficiency dx
- total serum bilirubin
- CMP
- rapid fluorescent spot test
- quantitative spectrophotometric analysis
- reticulocyte count
- serum aminotransferase
- lactate dehydrogenase
- A peripheral blood smear may show signs of hemolysis such as schistocytes.
Glucose-6-Phosphate Dehydrogenase Deficiency clinical
pallor, jaundice, dark urine, abdominal/back pain, renal insufficiency,
Hemolytic Disease of the Newborn path
fetomaternal hemorrhage exposes maternal circulation to antigens present on fetal RBCs -> maternal sensitization -> formation of maternal IgG antibodies against fetal RBCs -> IgG antibodies small enough to cross placenta -> antibody attachment to fetal cells -> agglutination -> microcirculatory impairment -> hemolysis, destruction of RBCs by macrophages in reticuloendothelial system
Hemolytic Disease of the Newborn comp
Acute bilirubin encephalopathy, cerebral palsy, auditory dysfunction, paralysis of upward gaze, and permanent intellectual dysfunction
Hemolytic Disease of the Newborn clinical
anemia and hyperbilirubinemia, which may present as lethargy, jaundice, conjunctival icterus, pallor, hepatosplenomegaly, tachycardia or bradycardia, increased oxygen requirement, and/or apnea
Hemolytic Disease of Newborn dx
maternal RBC antibodies (agglutination in an indirect antibody test) and/or a positive direct antibody test (DAT) in the infant’s serum
Hereditary Spherocytosis path
mutation of genes encoding for proteins that secure RBC membrane skeleton to plasma membrane -> membrane destabilization -> rigidity, resistance to deformability -> hemolysis
Hereditary Spherocytosis comp
transient aplastic crisis caused by parvovirus B19
megaloblastic anemia
neonatal icterus, non-immune hydrops fetalis
Hereditary Spherocytosis clinical
Mild: anemia, splenomegaly, jaundice, modest reticulocytosis, normal hemoglobin, adolescents/adults
Moderate: anemia, reticulocytosis, hyperbilirubinemia, infants/children
Severe: anemia, hyperbilirubinemia, splenomegaly,
Hereditary Spherocytosis RF
northern European descent
Hereditary spherocytosis dx
Diagnosis is considered positive in patients who present Coombs-negative hemolysis with increased mean corpuscular hemoglobin concentration (MCHC), positive history for hereditary spherocytosis and spherocytes on microscopy, or by a positive result in a specialized test such as osmotic fragility, eosin-5-maleimide (EMA), or acidified glycerol lysis test (AGLT)
Sickle cell anemia path
point mutation of beta globin gene -> produces hemoglobin S -> RBC polymerize, deform into sickle/crescent-shaped forms when deoxygenated
Sickle cell anemia RF
areas where there are mosquitoes that carry malaria
Sickle cell anemia comp
ischemia/infraction, stroke, transient ischemic attack, seizures, MI, dysrhythmias, cardiomyopathy, HF, thromboembolism, leg ulcers, sudden death, acute chest syndrome, pulmonary HTN, priapism, pregnancy complications, osteoporosis, proliferative retinopathy, retinal detachment, multiorgan failure
Sickle cell anemia clinical
fatigue, activity intolerance, exertional dyspnea, hypersplenism, pain, vaso-occlusion, dactylitis, increased risk of infx,
Sickle Cell anemia dx
- “Sickle” shaped RBC with pointed ends on peripheral smear
- TIBC deceased
- Transferrin decreased
- electrophoresis
Anemia of chronic disease cause
infx, cancer, diabetes, autoimmune,
Anemia of chronic disease path
systemic inflammation -> ↑ circulation cytokines, IL-1, IL-6, TNF alpha, IFN beta, IFN gamma -> ↑ hepcidin secretion by liver -> ↓ iron absorption from GI tract, ↓ iron sequestration in reticuloendothelial system -> ↓ iron available for erythropoiesis -> ↓ secretion erythropoietin -> ↓ erythrocyte lifespan
Anemia of chronic disease labs
- normochromic normocytic
- low serum iron
- high ferritin
- TIBC normal
- Reticulocyte count low
Aplastic anemia cause
Fanconi anemia, Shwachman-Diamond syndrome, SLE, graft-versus-host disease, paroxysmal nocturnal hemoglobinuria, chemotherapy, carbamazepine, phenytoin, indomethacin, sulfonamides, Epstein-Barr, HIV, hepatitis, herpes, solvents, benzene, pesticides, radiation, idiopathic
Aplastic anemia path
bone marrow hypoplasia/aplasia, hematopoietic cell loss -> ↓ production of cell lineages -> peripheral pancytopenia
Aplastic anemia clinical
shorter lifespan, ↑ infx, neutropenia-related sepsis, gingival nares, ecchymosis, petechiae, heavy menstrual flow, occult blood in stool, intracranial hemorrhage, pallor, fatigue, dyspnea, activity intolerance, cardiorespiratory compromise
Aplastic anemia dx
- Normocytic
- Normochromic
- Serum iron elevated
- Reticulocytes count decreased
- Bone marrow aspiration
Megaloblastic anemia cause
cobalamin and/or folate deficiency due to diet, malabsorption, medications, surgery, pancreatic insufficiency, alcoholism
Megaloblastic anemia path
impaired DNA synthesis during erythropoiesis -> uncoordinated maturation of cytoplasm and nuclei in erythroblasts -> abnormally large RBCs + deflective cells w/ fragile membranes -> RBC die prematurely -> anemia
Megaloblastic anemia RF
alcohol use, old age, strict diets,
Megaloblastic anemia clinical
fatigue, activity intolerance, pallor, tachycardia, bounding pulse, jaundice, splenomegaly, glossitis
megoblastic anemia dx
- Macrocytic
- Ferritin increased
- B12 decreased
- Folate decreased
- Bilirubin increased
- Peripheral smear- neutrophil 5 or more segments
sideroblastic anemia cause
X-linked/autosomal recessive/mitochondrial inheritance, myelodysplastic syndromes, myeloproliferative neoplasms, excessive alcohol, isoniazid, chloramphenicol, copper deficiency, zinc overload
sideroblastic anemia path
impaired erythropoiesis, hemoglobin synthesis -> reduced iron in RBCs + defective RBCs undergo apoptosis w/in bone marrow + fewer functional RBCs in circulation -> anemia
sideroblastic anemia RF
genetics, alcohol, diet
sideroblastic anemia comp
iron overload, hemochromatosis, erythroid hyperplasia of bone marrow, increased risk of infx, acute leukemia, infx fatal
sideroblastic anemia clinical
fatigue, dyspnea, palpitations, pallor, mild jaundice, hepatosplenomegaly, cardiac arrhythmias, HF
Sideroblastic anemia dx
- Microcytic/ normocytic
- Hypochromic
- Basophilic stippling
- Ferritin elevated
- Serum iron elevated
- Transferrin saturation elevated
Polycythemia Vera path
JAK2V617F mutation
hematopoietic stem cell -> ↑ RBCs, platelets, basophils, eosinophils -> ↑ blood viscosity, ↑ total blood volume -> may evolve into spent phase
Polycythemia Vera RF
radiation, age, genetics
Polycythemia Vera comp
HTN, Budd-Chiari syndrome, DVT, arterial thrombosis, MI, gout, AML
Polycythemia Vera clinical
headache, fatigue, dizziness, dyspnea, plethora, cyanosis, pruritus, gastric ulcers, DVT, MI, portal vein thrombosis, hyperemic and inflamed extremities, bleeding gums, epistaxis, ecchymoses, GI bleed, hepatosplenomegaly, HTN
Polycythemia Vera dx
- Increased RBC
- Increased Hgb
- High platelets
- High WBCs
- High LDH
- Panmyelosis in the BM
- Low EPO level
- Positive JAK2 mutation
- May also have increased platelets and granulocytes
Disseminated Intravascular Coagulation cause
DIC TEAR
Delivery TEAR: obstetric
Infection
Cancer: prostate, pancreas, lung, stomach
Toxemia of pregnancy
Emboli
Abruptio placentae
Retain fetus products
preeclampsia, obstetric hemorrhage, retained dead fetus, critical illness, mucin-secreting adenocarcinoma, acute promyelocytic leukemia, infx/sepsis (gram - bacteria), massive tissue injury, intravascular hemolysis, shock, snakebites
Disseminated Intravascular Coagulation path
release of procoagulants, tissue factors, bacterial components, enzymes/major endothelial injury -> excessive activation of coagulation cascade -> thrombosis of small/medium blood vessels -> activation of fibrinolysis to resolve clots -> fibrin degradation products released into circulation -> interfere w/ platelet aggregation, clot formation
Disseminated Intravascular Coagulation RF
sepsis, cancer, blood transfusion reaction, pancreatitis, liver disease, surgery, anesthesia,
Disseminated Intravascular Coagulation comp
thromboembolism, tissue hypoxia, infraction, hypoxia of kidney, liver, lung, brain
Disseminated Intravascular Coagulation dx
- alow platelet count
- elevated D-dimer concentration
- decreased fibrinogen concentration
- prolongation of clotting times such as prothrombin time (PT)
Hemophilia A cause
X-linked recessive mutation F8 gene
Hemophilia A path
quantitative/qualitative deficiency of factor VII -> insufficient activation of the intrinsic pathway -> defect in common coagulation pathway -> increased tendency for bleeding
Hemophilia A RF
male
Hemophilia A comp
intracerebral hemorrhage, stroke
Hemophilia A clinical
asymptomatic
easy bruising, prolonged bleeding, hematomas, muscle hematomas, hemophilic pseudotumor, GI bleeding, hematuria, severe epistaxis, joint irregularity and disability,
Hemophilia A dx
high aPPT
normal PT
platelet count normal
Hemophilia B cause
mutation of F9 on X chromosome
Hemophilia B path
qualitative/quantitative deficiency of coagulation factor IX -> insufficient activation of intrinsic coagulation pathway -> impaired hemostasis