anemia in children - robert wood johnson medical...
TRANSCRIPT
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Anemia in children
Wilbur Pan, M.D., Ph.D.
Pediatric Hematology/OncologyBristol-Myers-Squibb Children’s HospitalCancer Institute of New Jersey
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• Diagnose, explain, and manage the following hematologic or oncologic conditions:
• Iron deficiency
• Hemoglobin traits
• Alpha and beta thalassemia
• Sickle cell
• Hgb E
• Lead poisoning
• Transient erythroblastopenia of childhood
• Minor, common reactions to blood transfusions
• Benign bone cyst
• Idiopathic thrombocytopenic purpura
• Nosebleeds
• Bruising
Common Conditions Not Referred (Hematology/Oncology). Diagnose and manage patients with hematological disorders that generally do not need referral
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What is anemia?
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• Definitions vary
• Laboratory – hemoglobin less than two standard deviations below the mean
• Red blood cell count
• Hemoglobin
• Hematocrit
Definition of anemia
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• Physiologic – hemoglobin too low to support O2 needs of the body
Definition of anemia
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• Production and development of blood cells
• Pleuripotent stem cell
• continuous self-replication
• gives rise to all blood cell lines
• Growth factors (cytokines) - promote differentiation into mature blood elements
Hematopoiesis
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Erythroid Maturation Sequence
Proerythroblast(Pronormoblast)
BasophilicNormoblast
PolychromatophilicNormoblast
OrthochromatophilicNormoblast
Reticulocyte
Erythrocyte
Early Intermediate Late
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• Hemoglobin (Hgb) -
• direct measurement (g/dl)
• Hematocrit (Hct) -
• packed RBC volume - manual “spun” hematocrit (%)
• automated counters calculate based on RBC number and size
Red Blood Cell
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• Mean corpuscular volume (MCV) - average size of the RBCs
• Mean cell hemoglobin (MCH) - Hgb/RBC
• Mean cell hemoglobin concentration (MCHC) - Hgb/Hct
• Red blood cell distribution width (RDW) - index of size variation
Red Blood Cell Indices
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What is anemia?
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• Age
• Sex
• Race
• Altitude
Factors that affect hemoglobin
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• Hemoglobin: 11 + 0.1 rule
• MCV: 70 + 1 rule
Normal hemoglobin indices
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• History
• Symptoms
• Weakness, malaise, fatigue
• CNS hypoxia - headaches, faintness, visual changes
• Skin pallor, thinning and inelasticity
• Nail brittleness
• Nonspecific signs and symptoms
• Diet
• Jaundice
• Family history
• Prior normal CBC
Evaluation of child with anemia
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• Physical exam
• Pallor
• Jaundice
• Cardiovascular status
• Splenomegaly
• Lymphadenopathy
• Other diseases
Evaluation of child with anemia
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• Make sure the child is not bleeding!
Evaluation of child with anemia
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• Microcytic anemia
• Iron deficiency
• Lead poisoning
• Thalassemia
• Anemia of chronic disease
Morphologic classification of anemia
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• Macrocytic anemia
• B12 deficiency
• Folate deficiency
• Thiamine depletion
• Aplastic anemia
• Diamond-Blackfan anemia
• Bone marrow infiltration
• Hypothyroidism
• Liver disease
Morphologic classification of anemia
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• Normocytic anemia
• Red cell membrane defects
• Enzyme defects
• Hemoglobinopathies
• Renal disease
• Antibody mediated hemolysis
• Microangiopathic hemolysis
• Splenic sequestration
• Blood loss
Morphologic classification of anemia
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• Anemia means not enough RBCs
• Inadequate production
• Excessive destruction
Pathophysiologic classification
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• Distinguish between decreased production and increased destruction
• Reticulocyte count
What test?
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• Decreased/altered nutrition
• iron deficiency, B12 deficiency, folate deficiency, lead poisoning
• Anemia of chronic disease
• Decreased erythropoietin
• Marrow infiltration/dysfunction
• Infection, drugs, radiation, toxins, TEC, DBA, cancer
Anemia due to inadequate production
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• Acquired
• antibody mediated
• toxin mediated, infections (malaria)
• mechanical (microangiopathic, HUS, artificial valve)
• Intrinsic
• Membrane defects: hereditary spherocytosis
• Hemoglobinopathies: Hgb SS, thalassemias
• Enzyme defects: G6PD, pyruvate kinase
Anemia due to excessive destruction
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• CBC/diff
• Reticulocyte count
• Coomb’s test (direct)
Initial lab tests
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• Most common nutritional deficiency
• Required in hemoglobin synthesis
• Heme + globin chains = hemoglobin
• Occurs in RBC cytoplasm
• Hypochromic microcytic anemia
Iron deficiency
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• Iron is absorbed primarily in duodenum
• 25% of heme-bound iron (red meat)
• 1-2% of non-heme iron
• Body losses of iron are limited
• 1-2 mg/day by epithelial cell shedding
• Mucosal block - maintains balance
Iron metabolism
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• Transport protein for iron in blood
• Fully saturated transferrin = TIBC
• 300 - 350 µg/dl Fe
• Normal transferrin
• 1/3rd bound with iron
• 100 - 120 µg/dl Fe (serum iron)
Transferrin
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• Ferritin – protein-iron complex
• Found in all tissues
• BM, liver (transferrin)
• Spleen (RBC breakdown)
• Hemosiderin - breakdown product of ferritin
Iron Storage
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• Depletion of stores
• ↓ serum ferritin
• ↓ serum Fe, ↑ transferrin (↑ TIBC)
• ↓ stainable BM iron
• ↓ transferrin saturation
• ↓ hemoglobin, myoglobin, Fe proteins
Development of Iron Deficiency
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• Anemia - nonspecific findings
• Blue sclera
• Pica
• Koilonychia
• Developmental delay
Iron Deficiency Anemia - Clinical Manifestations
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• Hypochromic microcytic anemia
• (↓ RBC count, ↓ MCV)
• ↓ Serum ferritin levels
• ↓ Transferrin saturation
• (↓ serum Fe, ↑ transferrin)
Iron Deficiency Anemia Laboratory Findings
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• External blood loss - most common
• Female genital tract
• Gastrointestinal tract
• Increased demand
• Infancy
• pregnancy
• Intestinal malabsorption syndrome
Causes of Iron Deficiency (Adult version)
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• Dietary deficiency
• Milk monster
• Decreased bioavailability
• Increased needs
• Possible chronic GI losses
• Vegetarian diets
• Bleeding
Causes of Iron Deficiency (Pediatric version)
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• Oral supplementation
• FeSO4: 6 mg/kg elemental iron
• No milk
• No milk
• No milk
• Fe rich foods
• Parental supplementation
• Iron dextran
• Developmental followup
Iron Deficiency – Therapy