Download - Minarcik robbins 2013_ch13-rbc
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RBC
and BLEEDING DISORDERS
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RBC and Bleeding Disorders• NORMALNORMAL– Anatomy, histologyAnatomy, histology–DevelopmentDevelopment– PhysiologyPhysiology
• ANEMIASANEMIAS– Blood loss: acute, chronicBlood loss: acute, chronic–HemolyticHemolytic–Diminished erythropoesisDiminished erythropoesis
• POLYCYTHEMIAPOLYCYTHEMIA• BLEEDING DISORDERSBLEEDING DISORDERS
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TABLE 13-2 -- Adult Reference Ranges for Red Blood Cells
Measurement (units) Men WomenHemoglobin (gm/dL) 13.6–17.2 12.0–15.0
Hematocrit (%) 39–49 33–43
Red cell count (106 /µL) 4.3–5.9 3.5–5.0
Reticulocyte count (%) 0.5–1.5
Mean cell volume (µm3 ) MCV 82–96
Mean corpuscular hemoglobin (pg) MCH 27–33
Mean corpuscular hemoglobin concentration (gm/dL) MCHC
33–37
RBC distribution width 11.5–14.5
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WHERE is MARROW?• Yolk Sac: very early embryo• Liver, Spleen: NEWBORN• BONE– CHILDHOOD: AXIAL SKELETON & APPENDICULAR
SKELETON BOTH HAVE RED (active) MARROW– ADULT: AXIAL SKELETON RED MARROW,
APPENDICULAR SKELETON YELLOW MARROW
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MARROW FEATURES• CELLULARITY 50%• MEGAKARYOCYTES at least 1-2/hpf• M:E RATIO 3:1• MYELOID MATURATION 1/3 bands or more• ERYTHROID MATURATION nucleus/cytoplasm• LYMPHS, PLASMA CELLS small percentage• STORAGE IRON, i.e., HEMOSIDERIN present• “FOREIGN CELLS”
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MARROW“DIFFERENTIATION”
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ANEMIAS*• BLOOD LOSS–ACUTE–CHRONIC
• IN-creased destruction (HEMOLYTIC)• DE-creased production
* A good definition would be a decrease in OXYGEN CARRYING CAPACITY, rather than just a decrease in red blood cells, because you need to have enough blood cells THAT FUNCTION, and not just enough blood cells.
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Features of ALL anemias• Pallor, where?• Tiredness•Weakness• Dyspnea, why?• Palpitations• Heart Failure (high output), why?
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Blood LossAcute: trauma
Chronic: lesions of gastrointestinal tract, gynecologic disturbances. The features of chronic blood loss anemia are the same as iron deficiency anemia, and is defined as a situation in which the production cannot keep up with the loss.
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HEMOLYTIC• HEREDITARY– MEMBRANE disorders: e.g., spherocytosis– ENZYME disorders: e.g., G6PD deficciency– HGB disorders (hemoglobinopathies)
• ACQUIRED– MEMBRANE disorders (PNH)– ANTIBODY MEDIATED, transfusion or autoantibodies– MECHANICAL TRAUMA (vascular or mechanic)– INFECTIONS– DRUGS, TOXINS– HYPERSPLENISM
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IMPAIRED PRODUCTION• Disturbance of proliferation and differentiation
of stem cells: aplastic anemias, pure RBC aplasia, renal failure
• Disturbance of proliferation and maturation of erythroblasts
• Defective DNA synthesis: (Megaloblastic)• Defective heme synthesis: (Fe)• Deficient globin synthesis: (Thalassemias)
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MODIFIERS• MCV, microcytosis, macrocytosis• MCH • MCHC, hypochromic• RDW, anisocytosis
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HEMOLYTIC ANEMIAS• Life span LESS than 120 days• Marrow hyperplasia (M:E), EPO+• Increased catabolic products,
e.g., bilirubin, serum HGB, hemosiderin, haptoglobin-HGB
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HEMOLYSIS• INTRA-vascular (vessels)• EXTRA-vascular (spleen)
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M:E Ratio normally 3:1
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HEREDITARY SPHEROCYTOSIS
Genetic defects affecting ankyrin, spectrin, usually autosomal dominant
Children, adults
Anemia, hemolysis, jaundice, splenomegaly, gallstones (what kind?)
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Glucose-6-Phosphate Dehydrogenase (G6PD) Deficiency
• A- and Mediterranean are most significant types
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FEATURES of G6PD Defic.• Genetic: X-linked• Can be triggered by foods (fava beans),
oxidant substances drugs (primaquine, chloroquine), or infections
• HGB can precipitate as HEINZ bodies• Acute intravascular hemolysis can occur:–Hemoglobinuria–Hemoglobinemia–Anemia
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Sickle Cell Disease• Classic hemoglobinopathy• Normal HGB is α2 β2: β-chain defects (Val->Glu)• Reduced hemoglobin “sickles” in homozygous• 8% of American blacks are heterozygous
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Clinical features of HGB-S disease
• Severe anemia• Jaundice• PAIN (pain CRISIS)• Vaso-occlusive disease: EVERYWHERE, but
clinically significant bone, spleen (autosplenectomy)
• Infections: Pneumococcus, Hem. Influ., Salmonella osteomyelitis
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THALASSEMIAS• A WIDE VARIETY of diseases involving GLOBIN synthesis,
COMPLEX genetics
• Alpha or beta chains deficient synthesis involved• Often termed MAJOR or MINOR, depending on severity,
silent carriers and “traits” are seen• HEMOLYSIS is uniformly a feature, and microcytic anemia,
i.e, LOW MCV (just like iron deficiency anemia has a low MCV)
• A “crew cut” skull x-ray appearance may be seen in severe erythroid hyperplasia.
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Hemoglobin H Disease• Deletion of THREE alpha chain genes• HGB-H is primarilly Asian
• HGB-H has a HIGH affinity for oxygen• HGB-H is unstable and therefore has
classical hemolytic behavior
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HYDROPS FETALIS• FOUR alpha chain genes are deleted, so this is
the MOST SEVERE form of thalassemia• Many/most never make it to term• Children born will have a SEVERE hemolytic
anemia as in the erythroblastosis fetalis of Rh disease:– Pallor (as in all anemias), jaundice, kernicterus– Edema (hence the name “hydrops”)– Massive hepatosplenomegaly (hemolysis)
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Paroxysmal Nocturnal Hemoglobinuria (PNH)
• ACQUIRED, NOT INHERITED like all the previous hemolytic anemias were
• ACQUIRED mutations in phosphatidylinositol glycan A (PIGA)
• Note: It is “P” and “N” only 25% of the time!
GlycosylphosPhatidylInositol (lipid rafts)
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Immunohemolytic Anemia• All of these have the presence of antibodies
and/or compliment present on RBC surfaces• NOT all are AUTOimmune, some are caused
by drugs• Antibodies can be–WARM AGGLUTININ (IgG)–COLD AGGLUTININ (IgM)–COLD HEMOLYSIN (paroxysmal) (IgG)
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IMMUNOHEMOLYTIC ANEMIAS• WARM AGGLUTININS (IgG), will NOT hemolyze at
room temp– Primary Idiopathic (most common)– Secondary (Tumors, especially leuk/lymph, drugs)
• COLD AGGLUTININS: (IgM), WILL hemolyze at room temp– Mycoplasma pneumoniae, HIV, mononucleosis
• COLD HEMOLYSINS: (IgG) Cold Paroxysmal Hemoglobinuria, hemo-LYSIS in body, ALSO often follows mycoplasma pneumoniae
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COOMBS TEST• DIRECT: Patient’s CELLS are
tested for surface Ab’s• INDIRECT: Patient’s SERUM is
tested for Ab’s.
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HEMOLYSIS/HEMOLYTIC ANEMIAS DUE TO RBC TRAUMA
• Mechanical heart valves breaking RBC’s• MICROANGIOPATHIES:–TTP–Hemolytic Uremic Syndrome
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NON-Hemolytic Anemias:i.e., DE-creased Production
• “Megaloblastic” Anemias• B12 Deficiency (Pernicious Anemia)• Folate Deficiency• Iron Deficiency• Anemia of Chronic Disease• Aplastic Anemia• “Pure” Red Cell Aplasia• OTHER forms of Marrow Failure
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MEGALOBLASTIC ANEMIAS• Differentiating megaloblasts
(marrow) from macrocytes (peripheral smear, MCV>94)
• Impaired DNA synthesis• For all practical purposes,
also called the anemias of B12 and FOLATE deficiency
• Often VERY hyperplastic/hypercellular marrow* (* exception to the rule)
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Decreased intake
Inadequate diet, vegetarianism
Impaired absorption
Intrinsic factor deficiency
Pernicious anemia
Gastrectomy
Malabsorption states
Diffuse intestinal disease, e.g., lymphoma, systemic sclerosis
Ileal resection, ileitis
Competitive parasitic uptake
Fish tapeworm infestation
Bacterial overgrowth in blind loops and diverticula of bowel
Increased requirement
Pregnancy, hyperthyroidism, disseminated cancer
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Vit-B12 Physiology• Oral ingestion• Combines with INTRINSIC FACTOR in
the gastric mucosa
• Absorbed in the terminal ileum
• DEFECTS at ANY of these sites can produce a MEGALOBLASTIC anemia
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Please remember that ALL megaloblastic anemias are also MACROCYTIC (MCV>94 or MCV~100), and that not only are the RBC’s BIG and hyperplastic/hypercellular, but so are the neutrophils, and neutrophilic precursors in the bone marrow too, and even more so, HYPERSEGMENTED!!!
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PERNICIOUS ANEMIA• MEGALOBLASTIC anemia• LEUKOPENIA and HYPERSEGS• JAUNDICE…???
• NEUROLOGIC posterolateral spinal tracts• ACHLORHYDRIA• Can’t absorb B12• LOW serum B12• Flunk Schilling test, i.e., can’t absorb B12,
using a radioactive tracer
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FOLATE DEFICIENCY MEGALOBLASTIC AMEMIAS
• Decreased Intake: diet, etoh-ism, infancy• Impaired Absorption: intestinal disease• DRUGS: anticonvulsants, BCPs, CHEMO• Increased Loss: hemodialysis• Increased Requirement: pregnancy, infancy• Impaired Usage
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Fe Deficiency Anemia• Due to increased loss or decreased
ingestion, almost always, in USA, nowadays, increased loss is the reason
• Microcytic (low MCV), Hypochromic (low MCHC)
• THE ONLY WAY WE CAN LOSE IRON IS BY LOSING BLOOD, because FE is recycled!
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Fe
Transferrin
Ferritin/apo- (GREAT test)
Hemosiderin
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Clinical Fe-Defic-Anemia• Adult men: GI Blood Loss• PRE menopausal women:
menorrhagia• POST menopausal women: GI Blood
Loss
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2 BEST lab tests:• Serum Ferritin•Prussian blue hemosiderin
stain of marrow (also called an “iron” stain)
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?
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Anemia of Chronic Disease*•CHRONIC INFECTIONS•CHRONIC IMMUNE
DISORDERS•NEOPLASMS• LIVER, KIDNEY failure
* Please remember these patients may very very much look like iron deficiency anemia, BUT, they have ABUNDANT STAINABLE HEMOSIDERIN in the marrow!
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APLASTIC ANEMIAS• ALMOST ALWAYS involve platelet and
WBC suppression as well• Some are idiopathic, but MOST are
related to drugs, radiation• FANCONI’s ANEMIA is the only one that
is inherited, and NOT acquired• Act at STEM CELL level, except for
“pure” red cell aplasia
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APLASTIC ANEMIAS
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APLASTIC ANEMIAS• CHLORAMPHENICOL• OTHER ANTIBIOTICS• CHEMO• INSECTICIDES, benzene, toluene, TNT• VIRUSES– EBV–HEPATITIS–VZ
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MYELOPHTHISIC ANEMIAS
• Are anemias caused by metastatic tumor cells replacing the bone marrow extensively
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POLYCYTHEMIA• Relative (e.g., hemoconcentration)• Absolute– POLYCYTHEMIA VERA (Primary) (LOW EPO), mutation in
tyrosine kinase, making RBCs hyper responsive to EPO
– POLYCYTHEMIA (Secondary) (HIGH EPO)• HIGH ALTITUDE• EPO TUMORS• EPO “Doping”• CVAC, the trendy California bubble pods
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P. VERA•A “myeloproliferative”
disease•ALL cell lines are increased,
not just RBCs
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BLEEDING DISORDERS(aka, Hemorrhagic “DIATHESES”)• Blood vessel wall abnormalities √• Reduced platelets √• Decreased platelet function √• Abnormal clotting factors √• DIC (Disseminated INTRA-vascular
Coagulation), also has ↓ plats.
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VESSEL WALL ABNORMALITIES(angiopathic thrombocytopenias)
(NON-thrombotic purpuras)• Infections, especially, meningococcemia, and rickettsia• Drug reactions causing a leukocytoclastic vasculitis• Scurvy, Ehlers-Danlos, Cushing syndrome• Henoch-Schönlein purpura (mesangial deposits too)• Hereditary hemorrhagic telangiectasia• Amyloid
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THROMBOCYTOPENIAS• Like RBCs:–DE-creased production–IN-creased destruction–Sequestration (Hypersplenism)–Dilutional
• Normal value 150K-300K
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DE-CREASED PRODUCTION• APLASTIC ANEMIA• ACUTE LEUKEMIAS• ALCOHOL, THIAZIDES, CHEMO• MEASLES, HIV• MEGALOBLASTIC ANEMIAS• MYELODYSPLASTIC SYNDROMES
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IN-CREASED DESTRUCTION• AUTOIMMUNE (ITP)• POST-TRANSFUSION (NEONATAL)• QUINIDINE, HEPARIN, SULFA• MONO, HIV• DIC• TTP• “MICROANGIOPATHIC”
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THROMBOCYTOPENIAS• ITP (Idiopathic Thrombocytopenic
Purpura)• Acute Immune• DRUG-induced• HIV associated• TTP, Hemolytic Uremic Syndrome
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I.T.P.• ADULTS AND ELDERLY• ACUTE OR CHRONIC• AUTO-IMMUNE• ANTI-PLATELET ANTIBODIES PRESENT
• INCREASED MARROW MEGAKARYOCYTES
• Rx: STEROIDS
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ACUTE ITP• CHILDREN• Follows a VIRAL illness (~ 2 weeks)• ALSO have anti-platelet antibodies• Platelets usually return to normal in a
few months
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DRUGS• Quinine• Quinidine• Sulfonamide antibiotics
•HEPARIN
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HIV• BOTH DE-creased production
AND IN-creased destruction factors are present
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Thrombotic Microangiopathies
• BOTH are very SERIOUS CONDITIONS with a HIGH mortality:– TTP (THROMBOTIC THROMBOCYTOPENIC PURPURA)– H.U.S. (HEMOLYTIC UREMIC SYNDROME)
• These can also be called “consumptive” coagulopathies, just like a DIC
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“QUALITATIVE” platelet disorders• Mostly congenital (genetic):–Bernard-Soulier syndrome (Glycoprotein-
1-b deficiency)–Glanzmann’s thrombasthenia
(Glyc.-IIB/IIIA deficiency)– Storage pool disorders, i.e., platelets mis-
function because of defective granulation
• ACQUIRED: ASPIRIN, ASPIRIN, ASPIRIN
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PTT PT/INR
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BLEEDING DISORDERS due toCLOTTING FACTOR DEFICIENCIES
• NOT spontaneous, but following surgery or trauma• ALL factor deficiencies are possible• Factor VIII and IX both are the classic X-linked
recessive hemophilias, A and B, respectively• ACQUIRED disorders often due to Vitamin-K
deficiencies (II, VII, IX, X)
• von Willebrand disease the most common, 1%
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von Willebrand Disease• 1% prevalence, most common bleeding disorder• Spontaneous and wound bleeding• Usually autosomal dominant• Gazillions of variants, genetics even more complex• Prolonged BLEEDING TIME, NL platelet count• vWF is von Willebrand Factor, which complexes with
Factor VIII, to join platelets with the exposed ECM in endothelial disruption. it is the von Willebrand Factor which is defective in von Willebrand disease
• Usually BOTH platelet and FactorVIII-vWF disorders are present
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PTT PT/INR
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HEMOPHILIA A• The “classic” HEMOPHILIA• Factor VIII decreased• Co-factor of Factor IX to activate Factor X• Sex-linked recessive• Hemorrhage usually NOT spontaneous• Wide variety of severities
• Prolonged PTT (intrinsic) only• Rx: Recombinant Factor VIII
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HEMOPHILIA B• The “Christmas” HEMOPHILIA• Factor IX decreased• Sex-linked recessive• Hemorrhage usually NOT spontaneous• Wide variety of severities
• Prolonged PTT (intrinsic) only• Rx: Recombinant Factor IX
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DIC, Disseminated INTRA-vascular, Coagulation
• ENDOTHELIAL INJURY• WIDESPREAD FIBRIN DEPOSITION• HIGH MORTALITY• ALL MAJOR ORGANS COMMONLY INVOLVED
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DIC, Disseminated INTRA-vascular, Coagulation
• Extremely SERIOUS condition• NOT a disease in itself but secondary to many
conditions– Obstetric: MAJOR OB complications, toxemia, sepsis,
abruption– Infections: Gm-, meningococcemia, RMSF, fungi,
Malaria– Many neoplasms, acute promyelocytic leukemia– Massive tissue injury: trauma, burns, surgery
• “Consumptive” coagulopathy
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Common Coagulation TESTS• PTT (intrinsic)• PT INR (extrinsic)• Platelet count, aggregation• Bleeding Time, so EASY to do• Fibrinogen• Factor Assays