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Brooke Shared "Hematology Week 1 Hemostasis" - 12 Picmonics

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Hematology Week 1 Hemostasis

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
Glanzmann Thrombasthenia
Pathophysiology
Autosomal Recessive or Acquired as an Autoimmune Disorder
Deficiency of Glycoprotein IIb/IIIa (Gp IIb/IIIa) Receptor
Defective Platelet-to-Platelet Aggregation
Symptoms
Mucous Membrane Bleeding (Gingival Bleeding)
Easy Bruising
Increased Bleeding Time
Normal Platelet Count
Considerations
Avoid NSAIDs
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2 mins
Bernard-Soulier Syndrome
Mechanism
Autosomal Recessive
Deficiency of Glycoprotein Ib (GpIb) Receptor
Symptoms
Mucosal Membrane Bleeding
Menorrhagia
Easy Bruising
Labs
Large Platelets
Increased Bleeding Time
No Platelet Agglutination with Ristocetin
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3 mins
Hemophilia
Cause/Mechanism
Genetic Mutation
Assessment
Prolonged Bleeding
Pain
Hemarthrosis
Interventions
Clotting Factor Replacement Therapy
DDAVP (Desmopressin Acetate)
Antifibrinolytic Therapy
Analgesics
Considerations
Genetic Counseling
Prevent Injury
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3 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
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
Platelet Lab Value
150,000-400,000 Micro L
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40 secs
Immune Thrombocytopenic Purpura (ITP)
Anti GpIIb/IIIa Anitbodies
Splenic macrophage consumption of platelet-antibody complex
Decrease platelet count
Autoimmune
Bloody nose and gums
Increase bleeding time
Thrombocytopenia
Sudden onset petechiae and purpura
Rule out other causes: HIV, hep C
Seen after viral illness
Corticosteroids (initial)
IVIG (acute)
Splenectomy (refractory)
Rituximb (if splenectomy fails)
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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
INR Lab Value
0.8-1.2 Normal Range
Warfarin
2.0-3.0
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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

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Brooke Shared Hematology Week 1 Hemostasis - 12 Picmonics