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56 Cards in this Set
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Also known as enzyme precursors or zymogens Found in Plasma along w/ nonenzymatic cofactors and calcium |
Coagulation Factors |
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Substrates having no Biologic Activity |
Zymogens |
II, VII, IX, X, XI, XII, prekallikrein (2,7,9,10,11,12) |
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Zymogens converted by enzymes to active forms |
Serine Protease |
IIa, VIIa, IXa, Xa, XIa, XIIa & Kallikrein |
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Cofactors that assist in the activation of zymogens |
1. V 2. VIII 3. Tissue Factor 4. HMWK |
5, 8, 3 |
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Factor XIII in its active form is a |
Transglutaminase |
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Only substrate in the cascade that does not become an activated enzyme |
Fibrinogen or Factor 1 |
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Blood factors are produced mostly in the |
Liver |
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Factor 1 |
Fibrinogen |
Most Concentrated <10 mg/dL |
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Factor II |
Prothrombin |
Prethrombin
*80% Consumed during coagulation 20% Residual Prothrombin |
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Factor III |
Tissue Factor |
Tissue Thromboplastin |
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Factor IV |
CALCIUM |
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Factor V |
Proaccelerin |
Labile Factor Accelerator Globulin (Acg)
*80% in Plasma
Parahemophilia |
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Factor VII |
Proconvertin |
Stable Factor Serum Prothrombin Conversion Accelerator (SPCA) |
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Factor VIII:C |
Antihemophilic Factor (AHF)
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Antihemophilic Factor Globulin (AHG) Antihemophlic Factor A Platelet Cofactor 1
* Bethesda Assay - Factor 8 Inhibitor
* Classic Hemophilia/Royal Disease
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Factor IX |
Plasma Thromboplastin Component (PTC) |
Christmas Factor Antihemophilic Factor B Platelet Cofactor 2 |
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Factor X |
Stuart-Prower Factor |
Stuart Factor Prower Factor Autoprothrombin III |
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Factor XI |
Plasma Thromboplastin Antecedent (PTA) |
Anti-Hemophilic Factor C *Rosenthal Syndrome |
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Factor XII |
Hageman Factor
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1. Glass Factor 2. Contact Factor |
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Factor XIII |
Fibrin Stabilizing Factor |
1. Laki-lorand Factor 2. Fibrinase 3. Plasma Transglutaminase 4. Fibrinoligase |
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Prekallikrein |
Fletcher Factor |
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High Molecular Weight Kininogen (HMWK) |
1. Fitzgerald Factor 2. Contact Activation Cofactor 3. William's Factor 4. Flaujeac Factor |
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Common Pathway Factors |
I, II, V, X (1, 2, 5, 10) |
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Intrinsic Pathway Factors |
VIII, IX, XI, XII (8, 9, 11, 12) |
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Extrinsic Pathway Factors |
VII (7) |
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Fibrinogen Group |
I, V, VIII, XIII (1, 5, 8, 13) |
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Prothrombin Group |
II, VII, IX, X (2, 7, 9, 10) |
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Contact Group |
XII, XI, Prekallikrein, HMWK |
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Fibrinogen Group Characteristics: |
1. Not Vit K dependent 2. Calcium Dependent 3. Present Plasma Absent Serum 4. Not Adsorbed by BaSO4 |
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Prothrombin Group Characteristics: |
1. Vitamin K Dependent 2. Calcium Dependent 3. Present in Plasma & Serum (exc: II) 4. Adsorbed by BaSO4 |
Also adsorbed by Aluminum Hydroxide |
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Contact Group Characteristics: |
1. Not Vit K dependent 2. Not Calcium Dependent 3. Present in Serum & Plasma 4. Not Adsorbed by BaSO4 |
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Degrades factor Va & VIIIa |
Protein C & S |
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Major inhibitor of Thrombin Also inhibits Factors 9a, 10a, 11a, 12a, kallikrein and Plasmin |
Antithrombin III |
Also Inhibits Thrombin: 1. Heparin Cofactor II 2. A2 Macroglobulin 3. A1 Antitrypsin |
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Forms a complex w/ thrombin, kallikrein, & plasmin, thus inhibiting their activities |
A2 Macroglobulin |
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Inhibits 7a-Tissue Factor Complex |
Extrinsic Pathway Inhibitor (EPI) Lipoprotein Associated Coagulation Inhibitor (LACI) |
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Inactivator of Factor 12, & Kallikrein, also inhibits Factor 11a & Plasmin |
C1 Inhibitor |
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Inhibitor of Thrombin, 10a, 11a |
A1 Antytrypsin |
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Most Common Acquired Coagulopathy |
Acute Coagulopathy of Trauma Shock (ACOTS) |
Accounts for most fatal hemorrhage |
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Acquired Coagulopathies: |
1. Liver Dse 2. Vit K Def 3. Renal Failure |
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Most Common Congenital Deficiencies: |
1. vWD 2. Factor 8 & 9 Def 3. Plt Function Disorder |
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Most common congenital bleeding disorder Most Frequently inherited Coag Disorder |
vWD |
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Measures period required for free formation of blood clot after it has been removed from the body |
Coagulation/Clotting Time |
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Coag specimen should be centrifuged w/in |
1 hr after obtaining the sample Centri for 15 mins @2500g (Rodak: 1500g) |
Processing: 1. W/in 4 Hrs for APPT 2. W/in 24 Hrs for PT |
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Factors that will breakdown at temperatures above 37C |
5 & 8 |
LABILE FACTORS |
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Factors that will be activated at Cold Temperatures |
7 & 11 |
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Useful screening procedure for the extrinsic coag mechanism and the common pathway |
Prothrombin Time (PT) |
Will be prolonged if fibrinogen level is 100 mg/dL or Less (Rodak) <80 mg/dL (Brown) |
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PT Reagent |
Thromboplastin- Calcium Chloride |
Added to PPP obtained from Citrated Blood |
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Screening for factors involved in Intrinsic & Common Pathway Monitors Unfractioned Heparin Therapy |
Activated Partial Thromboplastin Time (APTT) |
Activators: 1. Kaolin 2. Celite 3. Silica 4. Ellagic Acid |
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Used to detect deficiencies in the Common Pathway Factors |
Stypven Time/Russel Viper Venom Time |
East Indian Viper Venom/ Vipera Russelli - A thromboplastin-like substance that activates factor X |
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Stypven Reagent |
Platelin- Calcium Chloride |
Added to PPP obtained from Citrated Blood |
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Detects availability of Functional Fibrinogen Affected by Heparin |
Thrombin Time |
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Reagent for Thrombin Time |
Thrombin- Calcium Chloride Reagent |
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Unaffected by Heparin Helpful in testing functional Fibrinogen when TT is prolonged due to Heparin |
Reptilase Time |
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Reagent for Reptilase Time |
Atroxin |
From Bothrops atrox snake |
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Screening for Factor XIII Deficiency |
Duckert's Test/ 5 M Urea Solubility Test |
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Reagents used in Duckert's Test |
1. 5 M Urea 2. 2% Acetic Acid 3. 1% Monochloroacetic Acid |
If Factor XIII is absent, the clot is dissolved in less than 24 Hrs by urea |
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Prolonged PT & APTT not corrected Inactivate an activated coagulation factor or block interaction b/w coag factors and platelets |
Circulating Anticoagulants |
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