Ace Your First Aid for the USMLE Step 1 (2021) Classes and Exams with Picmonic: #1 Visual Mnemonic Study Tool for Physician Assistant (PA) Students
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First Aid for the USMLE Step 1 (2021) | Physician Assistant (PA) School Study Aid
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
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
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
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
2 mins
