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Medicine (MD/DO)
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First Aid
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First Aid for the USMLE Step 1 (2019)
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First Aid for the USMLE Step 1 (2019) | Medicine (MD/DO) School Study Aid

Page 418 -
8 Picmonics to Learn | 18 mins
Hemochromatosis Pathophysiology
Pathophysiology
Hemosiderin Deposition
Autosomal Recessive
HLA-A3
Secondary to Transfusion Therapy
Increase Iron
Increase Ferritin
Increased Transferrin Saturation
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2 mins
Hemochromatosis Signs and Symptoms
Signs and Symptoms
Micronodular Cirrhosis
Hepatocellular Carcinoma
Diabetes
Bronze Skin Coloring
CHF
Arthropathy
Testicular Atrophy
Impotence
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2 mins
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
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2 mins
PT/PTT Lab Values
Prothrombin Time (PT)
10-14 seconds
Activated Partial Thromboplastin Time (PTT or aPTT)
25-35 seconds
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1 min
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
Vitamin K1 (Phytonadione)
Mechanism
Synthesizes Clotting Factors II, VII, IX, X
Indications
Hypoprothrombinemia
Newborn Prophylaxis
Bleeding from Warfarin Overdose
Side Effects
Shock
Kernicterus
Cardiac Arrest
Considerations
Bile Salts required for Intestinal Absorption
Increased Risks with IV Administration
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2 mins
Vitamin K Deficiency
Clinical Features
Bleeding
Neonatal Hemorrhage with Increased PT and aPTT
Etiologies
Liver Disease
Chronic Antibiotic Use
Vitamin K Antagonists
Malabsorption
Dietary Deficiencies
Diagnosis
Normal Bleeding Time
Increased PT and PTT
Considerations
Neonatal Vitamin K Injection
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3 mins
Antithrombin Deficiency
Characteristics
Autosomal Dominant
Increased Thrombin and Factor X
Heparin Resistance
Hypercoagulability
Diagnosis
Family History
Normal PT, PTT, and Bleeding Time
Antithrombin-Heparin Cofactor Assay
Management
Factor Xa Inhibitors
Direct Thrombin Inhibitors
Low Molecular Weight Heparin
Antithrombin Replacement
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3 mins

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