Alvin Shared "General Path" - 14 Picmonics

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General Path

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
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2 mins
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
Heparin Mechanisms
Mechanism of Action
Short Half-life
Antithrombin Activation Cofactor
Decrease Thrombin, Factor Xa
Side Effects
Bleeding
Heparin Induced Thrombocytopenia (HIT)
Antidote
Protamine Sulfate
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2 mins
Warfarin
Mechanism of Action
Interferes with Vitamin K-dependent Clotting Factors
Extrinsic Pathway
Bridge with Heparin
Indications
Chronic Anticoagulation
Side Effects
Bleeding
Necrosis
Cytochrome P450
Contraindications
Pregnancy
Antidote
FFP + Vitamin K
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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
Vitamin E (Alpha-tocopherol)
Mechanism
Antioxidant
Indications
Fat Malabsorption Syndrome
Alpha-TTP Deficiency
Side Effects
Bleeding
Considerations
Increased Risk Hemorrhagic Stroke
Limit Doses < 200 IU per Day
Nuts and Whole Grains
Vegetable Oils
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2 mins
Von Willebrand Disease
Mixed platelet and coagulation disorder
Mechanism
Autosomal Dominant Condition Leading to Reduced vWF
Defect in platelet plug formation
Labs
Increased Bleeding Time
PTT increased
Factor VIII decreased
Normal platelet count
Treatment
DDAVP (synthetic vasopressin)
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1 min
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
Innate Immunity Cellular Response
Characteristics
Natural Killer Lymphocytes Attack Abnormal Cells
Neutrophils in Blood
Infected Cells Release Interferon
Complement Proteins Lyse Pathogens/Infected Cells
Dendritic Cells in Tissue
Macrophages in Tissue
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2 mins
Humoral Adaptive Immunity
Characteristics
B Cell Binds Free Floating Antigen
B Cell Presents Antigen to Helper T Cell
Helper T Cells Help B Cells Develop Antigen Specificity
Plasma B Cells Secrete Antibodies
Memory B Cells Cause Faster Secondary Response
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2 mins
Hypersensitivity Type I
Previous Antigen Exposure
Immediate Reaction
IgE Cross-linking
Presensitized Mast Cells
Histamine Release
Vasodilation
Anaphylaxis
Allergies
Treatment
Epinephrine
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1 min
Hypersensitivity Type II
Cytotoxic
IgM or IgG antibody-mediated
Membrane Attack Complex (MAC)
Mechanism
Opsonization
Complement Activation
NK Cells
Testing
Direct Coombs test
Indirect Coombs Test
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1 min
Hypersensitivity Type III
Immune Complex
Antigen-antibody (IgG) complex activates complement
Neutrophils release lysozomal enzymes
Examples
Arthus Reaction
Serum Sickness
Systemic Lupus Erythematosus (SLE)
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1 min
Hypersensitivity Type IV
Delayed-Type Hypersensitivity
T Cell Mediated
Antibody Independant
Macrophages Activated
Examples
Transplant Rejection
PPD Skin Test
Contact Dermatitis
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1 min

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