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Unit 2 - Hematology
Coagulation Cascade Overview
Secondary Hemostasis
Intrinsic Pathway
Partial Thromboplastin Time (PTT)
Heparin
Extrinsic Pathway
Prothrombin Time (PT)
Warfarin
Common Pathway
Thrombin
Convert Fibrinogen to Fibrin
Stabilizes the Platelet Plug
2 mins
Clotting Overview
Characteristics
Endothelial Cells are Damaged
Platelets Respond to Exposed Collagen and Stick
Platelets Release Recruiting Factors
More Platelets are Attracted
Soluble Fibrinogen Turns to Insoluble Fibrin
Fibrin Seals the Clot
Clot Dissolves
Liver Produces Clotting Factors
2 mins
Hemoglobin
Hemoglobin Has Four Iron Hemes
Lots Of Hemoglobin In Red Blood Cells
High O2 Levels Increase O2 Binding
High Temperature Reduces O2 Binding
High CO2 Levels Reduce O2 Binding
Low pH Reduces O2 Binding
Myoglobin Binds Oxygen in Muscle
2 mins
Hemochromatosis Pathophysiology
Pathophysiology
Hemosiderin Deposition
Autosomal Recessive
HLA-A3
Secondary to Transfusion Therapy
Increase Iron
Increase Ferritin
Increased Transferrin Saturation
2 mins
Hemochromatosis Signs and Symptoms
Signs and Symptoms
Micronodular Cirrhosis
Hepatocellular Carcinoma
Diabetes
Bronze Skin Coloring
CHF
Arthropathy
Testicular Atrophy
Impotence
2 mins
Microcytic Anemia Causes
MCV < 80
Causes
Thalassemias
Chronic Disease or Illness
Lead Toxicity
Late Iron Deficiency
Sideroblastic Anemia
1 min
Normocytic Nonhemolytic Anemia Causes
MCV 80-100
Nonhemolytic
Anemia of Chronic Disease/Inflammation
Aplastic Anemia
Chronic Kidney Disease
Early Iron Deficiency
1 min
Normocytic Hemolytic Anemia Causes
Intrinsic Hemolytic
Hereditary Spherocytosis
RBC Enzyme Deficiency
Hemoglobin C Defect
Paroxysmal Nocturnal Hemoglobinuria (PNH)
Sickle Cell Anemia
Extrinsic Hemolytic
Autoimmune
Microangiopathic
Mechanical Destruction
Prosthetic Cardiac Valves
Infection
Snake Venom
2 mins
Macrocytic Anemia Causes
MCV > 100
Megaloblastic
B12 Deficiency
Folate Deficiency
Orotic Aciduria
Non Megaloblastic
Alcoholism
Liver Disease
Reticulocytosis
2 mins
Anemia Lab Values
Iron Deficiency Anemia
Serum Iron Decreased
Transferrin Increased
Ferritin Decreased
% Transferrin Saturation Decreased
Pregnancy and OCP Use
Serum Iron Normal
Transferrin Increased
Ferritin Normal
% Transferrin Saturation Decreased
Anemia of Chronic Disease
Serum Iron Decreased
Transferrin Decreased
Ferritin Increased
% Transferrin Saturation Decreased or Normal
Hemochromatosis
Serum Iron Increased
Transferrin Decreased
Ferritin Increased
% Transferrin Saturation Increased
3 mins
Iron Deficiency Anemia
Causes
Malnutrition/Malabsorption
Hemorrhage
Signs
Microcytic, Hypochromic Anemia
Decreased Heme Synthesis
Labs
Decreased Reticulocytes
Decreased Ferritin
Increased Red Cell Distribution Width (RDW)
Poikilocytosis
Anisocytosis
Increased Central Pallor
2 mins
Hereditary Spherocytosis Disease
Northern Europeans
Mechanisms
Autosomal Dominant
Spectrin/Ankyrin Deficiency
Spherocyte Formation
Hemolytic Anemia
Symptoms
Bilirubin Gallstones
Jaundice
Splenomegaly
3 mins
Hereditary Spherocytosis Diagnosis & Treatment
Labs
Increased MCHC
Spherocytes
Normocytic Anemia
Diagnosis
Eosin-5-Maleimide (EMA) Binding Test
Osmotic Fragility Test
Glycerol Lysis Test
Treatment
Folic Acid
Splenectomy
2 mins
Sickle Cell Anemia (Mechanism)
Intrinsic Normocytic Hemolytic Anemia
Point Mutation
Autosomal Recessive
African American
Dehydration or Decreased O2
Newborns Asymptomatic
Heterozygote Malarial Resistance
2 mins
Sickle Cell Anemia (Signs and Complications)
Signs
Crew-cut on Skull X-ray
Complications
Auto-splenectomy
Painful Crisis
Aplastic Crisis
Splenic-sequestration Crisis
Hyper-hemolytic Syndrome
Renal Papillary Necrosis
Salmonella osteomyelitis
Pulmonary Hypertension
Hyposthenuria
2 mins
Sickle Cell Anemia (Management)
Long Term Treatment
Hydroxyurea
Bone Marrow Transplant
Folate
Acute Treatment
Exchange Transfusion
Prophylaxis
Penicillin Prophylaxis
1 min
Beta Thalassemia
Mechanism
Microcytic, Hypochromic Anemia
Mediterranean Populations
Decreased Beta-Globin
Beta-Thalassemia Minor
Increased HbA2
No Intervention
Beta-thalassemia Major
Blood Transfusions
Hemochromatosis
Crew-cut on Skull X-Ray
Diagnosis
Electrophoresis
2 mins
Paroxysmal Nocturnal Hemoglobinuria (PNH)
Pathophysiology
Defective PIG-A Gene
Deficiency of DAF (Decay Accelerating Factor CD55)
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