Coagulation Factor
description
Transcript of Coagulation Factor
CoagulationFactor
Friction force
fibrinplatelet platelet platelet
platelet platelet
platelet
Antithrombotic pathway
Fibrinolytic pathway
vWF
contactPathway
Tissue f.Pathway
XV
Thrombin
Fibrinogen
FDP D-dimer
AT IIIpathway
Protein Cpathway
Fibrinolytic Pathwayplasminogen
TFPI
Hemarthrosis
Hemophilia혈우병
Pathologic bruisingin von Willebrand’s disease
platelet ( 혈소판 )vessel ( 혈관 )
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9 8
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5
2
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7
Fibrinclot
TissueFactorHMKN
PKIntrinsicpathway
Extrinsicpathway
Commonpathway
thrombin
fibrinogen
ActivatorKaolinSilica
Plateletphospholipid
Tissue Factorthromboplastin
IntrinsicPathway
ExtrinsicPathway
XV
Thrombin
FibrinogenFibrin
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98
Protein CProtein SATIII
Antithrombin III pathway
Heparin+
ATIII+
Heparin like Substance+
HCII+
Dermatan Sulfate
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8
10
7
52
PC + Thrombomodulin
* Thrombomodulin: thrombin receptor on endothelial cell
Thrombin+
PS free -- PS + C4b-BP
Activated PC+
PS free
aVIII
aV
APC resistenceFactor V Leiden:
Arg506Gln
* Cleavage site of Factor V 306,506,679
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10
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Protein C pathway
activated
VWf
PLT
PF4
Beta-TG
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Tissuefactor
Damaged endothelial cell
Tissue FactorPathway Inhibitor
4major
antithromboticpathways
Antithrombin
Protein CProtein S
TissueFactorPathwayInhibitor
Fibrinolytic System
Hypercoagulable stateProtein CProtein S
Antithrombin IIIPlasminogen
Factor V Leiden
Thrombi ( 혈전 )Thromboemboli
GpIbreceptor
Collagen fibronectin
fibrinogen
GpIIb/IIIa
VWf VWf Factor VIII
PLT
Old term New term
Factor VIII Protein Antigen Function
vWF Protein Antigen Function
VIII:C VIIIC:Ag
VIIIVIII:AgVIII:C
VIIIR:AgVIIIR:Ag
VIIIR:RCo
VWF VWF:Ag
VWF Activity
Factor VIII and VWF terminology
activated
VWf
PLT
PF4
Beta-TG
Damaged endothelial cell
bacterial glycopeptideristocetin
viper venome protein
Gp IIb/IIIa receptor
IIb
Transmembrane domain
Intracytoplasmic tail domain
Heterodimer
Intracellular actin cytoskeleton organizationfluxes in intracellular Ca
pHfocal adhesion kinase
세포의 기능motilitygrowth분화
IIIa
Gp IIb /IIIa
Decrease amount of Gp IIb/IIIaGenetic defect of Gp IIb/IIIa
Platelet aggregation testabsence of response to ADP, collagen, epinephrineimpaired response to ristocetin
GpIbreceptor
Collagen fibronectin
fibrinogen
GpIIb/IIIa
VWf VWf Factor VIII
PLT
Gp Ib
Platelet adhesion to damaged vesselsubendothelial matrix - vWF - GpIbsheet formation
Genetic defect of Gp Ib gene:Bernard Soulier syndromePlatelet aggregation test impaired response to ristocetin normal response to ADP, collagen, epinephrine
Fibrinogen
Fibrin monomer
Fibrin polymer
Fibrin clot
X
Y+DD E
YY/DYDYD/DYDD/E
D-dimer
FpA
D DE
Plasminogen system
F.XIII
Plasminogen activator Plasminogen Plasmin A1-antiplasm
Fibrin Fibrin
A1-antiplasmin + plasmin
Plasminogen Systemfibrinolytic system
• Vascular biology• Matrix remodelling• Tumor growth• Dissemination of tumor• Wound healing
Inflammatory cytokineGrowth factorCirculating hormonsBacterial productShear stressHydrostatic pressureCyclic strain
Gross modification of cell shapeReorganization of cytoskeletal elementsSSRE expressionDifferential display of mRNA transcript
eNOS (endothelial isoform of nitric oxide synthetase)COX-2 (inducible isoform of cyclo-oxygenase)MnSOD (manganase-dependent superoxide dismutase)
vasoprotective anti-atherogenic
Anti-thrombopticanti-adhesiveanti-proliferativeanti-oxidant
Friction force
Single Cell Vital Organ
Endothelial cell
Platelet test
• Bleeding time• Platelet count• Platelet adhesion test• Platelet aggregation test ADP, epinephrine, collagen, ristocetin• Gp IIb/IIIa receptor measurement
Screening test for coagualtion pathway
• Platelet count• Bleeding Time• PT, aPTT, fibrinogen• Thrombin time
Diagnostic tests: Coagulation assay
• factor I, II, V, VII, VIII, IX, X, XII• prekallikrein• HMWK• factor XIII
Fibrinolytic system test
• Fibrinogen, FDP, D-dimer• Plasminogen, Plasminogen activator• Plasminogen activator inhibitor• a2-antiplasmin
Antithrombotic pathway
• Antithrombin III• Protein C, Protein S• Factor V Leiden • Plasminogen
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Fibrinclot
Tissue FactorHMKNPK
thrombin
fibrinogenHeparin
+ATIII
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9 8
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Fibrinclot
TissueFactorHMKN
PK
APTT
ActivatorKaolinSilica
Plateletphospholipid
CaCl2
Tissue Factorthromboplastin
CaCl2
PT
aPTT 의 증가 : 효과적으로 anticoagulation 되었다고 판단할 수 없다 .
aPTT 검사 방법 , 시약 종류 , 검사 기기에 따른 차이 :standardized method 라는 것이 없다는 문제점
Heparin 종류에 따른 차이 : 종류가 다른 약을 사용할 경우 같은 aPTT 수치를 보여도 antithrombotic effect 는 현저히 다르다 .
Surrogate assay for heparin concentration
왜 aPTT 만을 기준으로 할 수 없는지 ?
History of Heparin Monitoring
1967 JAMA : Replacement of WBCT by aPTT 1972 NEJM : Historical TR of ratio of 1.5 - 2.5 1st prospective clinical study
1977 Blood : TR 0.2 - 0.4 U/ml by protamine titration 1986 NEJM : TR 0.3 - 0.7 U/ml by anti-Xa activity ‘ Gold Standard’
Reports on the problems in using Fixed Ratiod/t different responsiveness of different reagents1980, 1985, 1988, 1990 AM J Clin Pathol1990 Thromb Haemost
Anti-Xa Heparin Assay
Free AT + Heparin -> AT-Heparin
AT-Heparin + Fxa (in excess) -> AT-Heparin-Fxa + Fxa (residual)
Fxa (residual) + Substrate -> Signal
Platelet Count
Heparin antibody screening
AT III level
Heparin 투여 환자에서 사용전 점검할 항목
Heparin 투여환자의 혈소판수 검사
- Naïve paient 투여전 & 투여 4 일후부터 격일로 14 일간 혈소판수 검사
- prior heparin exposure 투여전 & 투여 1 일째부터 격일로 14 일간 혈소판수 검사
Consensus Recommendations : HIT
Confirm by assay for heparin mediated antibody if
- 혈소판수치가 heparin 투여전의 50% 이하로 감소 혈소판 수 <100,000/ul
- 혈소판 수치가 감소하지 않더라도 arterial or venous thrombosis 가 진행될 경우
LMWH 은 UH 와 무엇이 다른가 ?US: mixture of polysacchride chains(3,000-30,000)LMWH: UH 의 분획 , potent anti-Xa activity
Q & A about LMWH
LMWH 의 장점은 ?Decreased binding to nonanticoagulant-related plasma proteinGreater bioavailabilitylonger half lifelower incidence of HITPredictable anticoagulant activity: No monotoring
LMWH injection routeSubcutaneous injection (self)
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Fibrinclot
TissueFactorHMKN
PK
APTT
ActivatorKaolinSilica
Plateletphospholipid
CaCl2
Tissue Factorthromboplastin
CaCl2
PT
Prothrombin Time (PT)
• sec• %• International Normalized Ratio
정상 0.8 - 1.2 Therapeutic Range 2.0 - 3.0
AnticoagulantWarfarin
복용환자의 뇌출혈
Therapeutic Rangemonitorby PT