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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

Substrates having no Biologic Activity

Zymogens

II, VII, IX, X, XI, XII, prekallikrein


(2,7,9,10,11,12)

Zymogens converted by enzymes to active forms

Serine Protease

IIa, VIIa, IXa, Xa, XIa, XIIa & Kallikrein

Cofactors that assist in the activation of zymogens

1. V


2. VIII


3. Tissue Factor


4. HMWK

5, 8, 3

Factor XIII in its active form is a

Transglutaminase

Only substrate in the cascade that does not become an activated enzyme

Fibrinogen or


Factor 1

Blood factors are produced mostly in the

Liver

Factor 1

Fibrinogen

Most Concentrated


<10 mg/dL

Factor II

Prothrombin

Prethrombin



*80% Consumed during coagulation


20% Residual Prothrombin

Factor III

Tissue Factor

Tissue Thromboplastin

Factor IV

CALCIUM

Factor V

Proaccelerin

Labile Factor


Accelerator Globulin (Acg)



*80% in Plasma



Parahemophilia

Factor VII

Proconvertin

Stable Factor


Serum Prothrombin Conversion Accelerator (SPCA)

Factor VIII:C

Antihemophilic Factor


(AHF)


Antihemophilic Factor Globulin (AHG)


Antihemophlic Factor A


Platelet Cofactor 1



* Bethesda Assay


- Factor 8 Inhibitor



* Classic Hemophilia/Royal Disease


Factor IX

Plasma Thromboplastin Component (PTC)

Christmas Factor


Antihemophilic Factor B


Platelet Cofactor 2

Factor X

Stuart-Prower Factor

Stuart Factor


Prower Factor


Autoprothrombin III

Factor XI

Plasma Thromboplastin Antecedent (PTA)

Anti-Hemophilic Factor C



*Rosenthal Syndrome

Factor XII

Hageman Factor


1. Glass Factor


2. Contact Factor

Factor XIII

Fibrin Stabilizing Factor

1. Laki-lorand Factor


2. Fibrinase


3. Plasma Transglutaminase


4. Fibrinoligase

Prekallikrein

Fletcher Factor

High Molecular Weight Kininogen (HMWK)

1. Fitzgerald Factor


2. Contact Activation Cofactor


3. William's Factor


4. Flaujeac Factor

Common Pathway Factors

I, II, V, X


(1, 2, 5, 10)

Intrinsic Pathway Factors

VIII, IX, XI, XII


(8, 9, 11, 12)

Extrinsic Pathway Factors


VII (7)

Fibrinogen Group

I, V, VIII, XIII


(1, 5, 8, 13)

Prothrombin Group

II, VII, IX, X


(2, 7, 9, 10)

Contact Group

XII, XI, Prekallikrein, HMWK

Fibrinogen Group Characteristics:

1. Not Vit K dependent


2. Calcium Dependent


3. Present Plasma


Absent Serum


4. Not Adsorbed by BaSO4

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

Contact Group Characteristics:

1. Not Vit K dependent


2. Not Calcium Dependent


3. Present in Serum & Plasma


4. Not Adsorbed by BaSO4

Degrades factor


Va & VIIIa

Protein


C & S

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

Forms a complex w/ thrombin, kallikrein, & plasmin, thus inhibiting their activities

A2 Macroglobulin

Inhibits 7a-Tissue Factor Complex

Extrinsic Pathway Inhibitor (EPI)



Lipoprotein Associated Coagulation Inhibitor (LACI)

Inactivator of


Factor 12, & Kallikrein,


also inhibits


Factor 11a & Plasmin

C1 Inhibitor

Inhibitor of Thrombin, 10a, 11a

A1 Antytrypsin

Most Common Acquired Coagulopathy

Acute Coagulopathy of Trauma Shock (ACOTS)

Accounts for most fatal hemorrhage

Acquired Coagulopathies:

1. Liver Dse


2. Vit K Def


3. Renal Failure

Most Common


Congenital Deficiencies:

1. vWD


2. Factor 8 & 9 Def


3. Plt Function Disorder

Most common congenital bleeding disorder



Most Frequently inherited Coag Disorder

vWD

Measures period required for free formation of blood clot after it has been removed from the body

Coagulation/Clotting Time

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

Factors that will breakdown at temperatures above 37C

5 & 8

LABILE FACTORS

Factors that will be activated at Cold Temperatures

7 & 11

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)

PT Reagent

Thromboplastin-


Calcium Chloride

Added to PPP obtained from Citrated Blood

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

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

Stypven Reagent

Platelin-


Calcium Chloride

Added to PPP obtained from Citrated Blood

Detects availability of Functional Fibrinogen



Affected by Heparin

Thrombin Time

Reagent for


Thrombin Time

Thrombin-


Calcium Chloride Reagent

Unaffected by Heparin



Helpful in testing functional Fibrinogen when TT is prolonged due to Heparin

Reptilase Time

Reagent for


Reptilase Time

Atroxin

From Bothrops atrox snake

Screening for


Factor XIII Deficiency

Duckert's Test/


5 M Urea Solubility Test

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

Prolonged PT & APTT not corrected



Inactivate an activated coagulation factor or block interaction b/w coag factors and platelets

Circulating Anticoagulants