Juan Shared "Boards: HEME/ONC" - 103 Picmonics

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Boards: HEME/ONC

Coagulation Cascade
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
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2 mins
Vitamin K
Sources
Dark Green Leafy Vegetables
Synthesized by Intestinal Flora
Mechanism
Activated by Epoxide Reductase
Gamma Carboxylation of Glutamate
Activation of Clotting Factors II, VII, IX, X, Protein C and S
Considerations
Deficiency with Broad Spectrum Antibiotics
Neonatal Hemorrhage with Increased PT and aPTT
Warfarin is a Vitamin K Antagonist
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4 mins
Folate Deficiency
Clinical Features
Macrocytic Anemia
Megaloblastic Anemia
Etiologies
Malabsorption
Dietary
Tea and Toast
Alcoholics
Medication-induced
Methotrexate
Trimethoprim
Increased Requirement
Hemolytic Anemia
Pregnancy
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2 mins
Orotic Aciduria
Pathophysiology
Autosomal Recessive
Defect in UMP Synthase
De Novo Pyrimidine Synthesis Pathway
Symptoms
Increased Orotic Acid in Urine
Megaloblastic Anemia
No Response to B12 or Folate
Non-Hyperammonemic
Failure to Thrive
Treatment
Oral Uridine Monophosphate
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2 mins
Vitamin B12 (Cobalamin) Mechanism and Deficiency
Mechanism
Cobalamin
Large reserve pool in the liver
Homocysteine to methionine
Methylmalonyl CoA to succinyl CoA
Deficiency Signs and Symptoms
Macrocytic Megaloblastic Anemia
Hypersegmented Neutrophils
Neurologic defects
Posterior column
Lateral corticospinal tract
Spinocerebellar tract
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5 mins
Vitamin B12 (Cobalamin) Deficiency Causes
Causes
Vegans
Pernicious Anemia
Gastric Bypass Surgery
Malabsorption
Sprue
Enteritis
Crohn's Disease
Diphyllobothrium latum
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4 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
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3 mins
Normocytic Nonhemolytic Anemia Causes
MCV 80-100
Nonhemolytic
Anemia of Chronic Disease/Inflammation
Aplastic Anemia
Chronic Kidney Disease
Early Iron Deficiency
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1 min
Microcytic Anemia Causes
MCV < 80
Causes
Thalassemias
Chronic Disease or Illness
Lead Toxicity
Late Iron Deficiency
Sideroblastic Anemia
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1 min
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
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2 mins
Plummer-Vinson Syndrome
Triad of Symptoms
Dysphagia
Esophageal Webs
Glossitis
Iron Deficiency Anemia
Association
Squamous Cell Cancer of Esophagus
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1 min
Transfusion Reactions
Acute Hemolytic
Febrile, Non-Hemolytic
Mild Allergic
Anaphylactic
Circulatory Overload
Sepsis Reaction
Transfusion-Related Acute Lung Injury (TRALI)
Massive Blood Transfusion
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2 mins
Blood Transfusion Administration
Proper Patient Identification
Large Bore Needle
Y Tubing
Baseline Vital Signs
Slow IV Infusion
Monitor During First 15 Minutes or 50 mL of Blood
Monitor for Reactions
Considerations
Do Not Add Anything To Same IV Line
No Dextrose or Lactated Ringers
Jehovah's Witnesses, No Transfusions
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3 mins
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
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2 mins
Warm Agglutinin Autoimmune Hemolytic Anemia (W-AIHA)
Pathophysiology
Most Common Autoimmune Hemolytic Anemia
IgG Coats RBCs at Warm Temperatures
Fc Portion of IgG Recognized By Macrophages
Extravascular Hemolysis
Medications
Alpha Methyldopa
Chronic Lymphocytic Leukemia (CLL)
Systemic Lupus Erythematosus (SLE)
Diagnosis
Positive Coombs Test
Treatment
Corticosteroids
Splenectomy
Intravenous Immunoglobulin (IVIG)
Rituximab
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3 mins
Cold Agglutinin Autoimmune Hemolytic Anemia (C-AIHA)
Pathophysiology
IgM Binds to RBCs at Cold Temperatures (28-31C)
Intravascular Hemolysis
Waldenstrom's Macroglobulinemia
Mycoplasma Pneumoniae
Infectious Mononucleosis
Lymphomas and CLL
Symptoms
Acral Cyanosis with Cold Exposure
Blue Fingers and Toes
Diagnosis
Positive Coombs Test
Treatment
Avoid Cold
Rituximab
+/- Fludarabine
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3 mins
Heme synthesis Part 1
Mitochondria
glycine + succinyl-CoA
with B6
E: aminolevulinate synthase
rate limiting step
cytoplasm
aminolevulinic acid
E: aminolevulinate dehydratase
Porphobilinogen
E: porphobilinogen deaminase
hydroxymethylbilane
Uroporphyrinogen III synthase
Uroporphyrinogen
Note: aminolevulinate = ALA
Note: glucose and heme inhibit ALA synthase
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Heme synthesis Part 2
cytoplasm
Uroprophrinogen
E: uroporphyrinogen decarboxylase
coproporphyrinogen III
Mitochondria
protoporphyrin
with iron (Fe2+)
E: ferrochelatase
Heme synthesis
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Lead Antidotes
Antidotes
Penicillamine
Dimercaprol
CaEDTA
Succimer
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58 secs
Acute Intermittent Porphyria (AIP)
Pathophysiology
Autosomal Dominant
Inhibited Porphobilinogen Deaminase
Increased Serum Porphobilinogen
Increased Serum Delta-ALA
Increased Urinary Porphyrin Precursors
Signs & Symptoms
Precipitated By P450 Inducers
Painful Abdomen
Polyneuropathy
Psychological Disturbances
Port Wine-Colored Urine
Treatment
Glucose and Hemin
Considerations
Avoid Triggers
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3 mins

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