achieving perioperative hemostasis jay kambam, md, faca chief, cardiac anesthesia james a. haley va...
TRANSCRIPT
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Achieving Perioperative Hemostasis
Jay Kambam, MD, FACAChief, Cardiac Anesthesia
James A. Haley VA Medical CenterTampa, FL
&Adjunct Professor of Anesthesiology
USF, Tampa, FL &Vanderbilt University Medical Center
Nashville, TN
May 15, 2012
NO DISCLOSURES
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PERIOPERATIVE HEMOSTASIS
• Normal hemostasis is a complex interaction between vessel wall, platelet function, plasmatic coagulation, and fibrinolysis.
• Causes of perioperative coagulopathy and bleeding are multifactorial
• Because of PCI and Stents, multiple antiplatelet drugs and thrombin inhibitors are increasingly being used
• Understanding the details of perioperative hemostasis and pharmacodynamics of drugs involving hemostasis is essential
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Hemostasis
• Blood must be fluid• Must coagulate (clot) at appropriate time
– Rapid– Localized– Reversible (fibrinolysis)
Thrombosis…inappropriate coagulation
(Examples: DVT, Stent Thrombosis)
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HEMOSTASIS:3 Major systems involved
• Vessel wall vasoconstriction Endothelin
• Platelets First Hemostasis Plug
Adhesion, Activation, Aggregation (AAA)
• Coagulation cascade Second Hemostasis Plug
Coagulation factors Plasmin
FSP
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PLATELET ADHESION
VASOCONSTRICTION INITIAL RELEASE REACTION ADP
SEROTONIN PLATELET AGGREGATION
PHOSPHOLIPIDS INCREASED RELEASE REACTION ADP
COAGULATION
SECOND HEMOSTATIC PLUG FIRST HEMOSTATIC PLUG
(FIBRIN PLUG) (PLATELET PLUG)
HemostasisVessel Injury
Platelet-fibrin clot FSP
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EndothelinCollagen, vWF
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VESSEL WALL - ENDOTHELIUM
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Antithrombogenic Thrombogenic
Vessel injury or FB/Stent, low flow
(Favors fluid blood) (Favors clotting)
Anticoagulants Procoagulants
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VESSEL WALL - ENDOTHELIUM
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VESSEL WALL
Endothelin, Collagen, tPAI, vWF, Factors, PLProstacyclin, NO, ADPase, tPA, Heparin, Thrombomodulin
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Antithrombotic Properties of Endothelium
Anti-platelet properties
Covers highly thrombogenic basement membrane
Uninjured endothelium does not bind platelets PGI2 (prostacyclin) and NO from uninjured
endothelium inhibit platelet binding (anti-Txa2) ADPase counters the platelet aggregating
effects of ADP
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Antithrombotic Properties of the Endothelium Anticoagulant & Fibrinolytic properties
Heparin like molecules: activate anti-thrombin III
Thrombomodulin (glycoprotein) - Antithrombin– Binds to thrombin– Decreases ability to produce fibrin– Increases ability to activate Protein C, which inactivates factors Va
and VIIIa
Endothelial cells produce tPA which activates fibrinolysis via plasminogen to plasmin
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Prothrombotic Properties of Endothelium
Synthesis of von Willebrand factor (vWF)
Release of collagen & tissue factor (FIII)
Production of plasminogen activator inhibitors (tPAI)
Membrane phospholipids bind and facilitate activation of clotting factors via Ca++ bridges
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VASOCONSTRICTION
Serotonin causes vasoconstriction
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First Hemostasis Plug
PLATELETS
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Alpha Granule
Dense Granule
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Contents of platelet secretary granules and their physiological activities
Secretary Granules Physiological activities1.Alpha Granules
Coagulation factors I & V Cofactors for coagulation cascade
Platelet specific proteins
Platelet F4 PF4 potentiates ADP induced aggregation & antiheparin activity
Low affinity PF4 LA-PF4 possesses antiheparin actvty
Glycoproteins Adhesion and cell to cell interaction
2.Dense Granules
ADP and ATP ADP stimulates aggregation & secretion
Calcium Promotes coagulation
Serotonin Vasoconstriction
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Adhesion, Activation, Aggregation (AAA)
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PLATELET FUNCTION AGGREGATION
GPIIb/IIIa - fibrinogen interactionKey step for hemostasis, part of final
common pathwayTherapeutic target of inhibitors
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Platelet Activation Pathways
Arachidonicacid
TxA2
GP IIb/IIIa
Epine
phrin
e
Collagen ThrombinADP
P2Y12
PAR-4
GP1b
vWF
FibrinogenJay kambam
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Second Hemostasis PlugPLASMATIC COAGULATION
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PLATELET ADHESION
VASOCONSTRICTION INITIAL RELEASE REACTION ADP
SEROTONIN PLATELET AGGREGATION
PHOSPHOLIPIDS INCREASED RELEASE REACTION ADP
COAGULATION
SECOND HEMOSTATIC PLUG FIRST HEMOSTATIC PLUG
(FIBRIN PLUG) (PLATELET PLUG)
HemostasisVessel Injury
Platelet-fibrin clot FSP
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EndothelinCollagen, vWF
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Factor Trivial Name(s) Pathway: Intrinsic/Extrinsic
I Fibrinogen Both
II Prothrombin Both
III Tissue Factor Extrinsic
IV Calcium Both
V Proaccelerin, labile factor, accelerator
(Ac-) globulin Both
VI (same as Va) Accelerin Both
VII Proconvertin, serum prothrombin
conversion accelerator (SPCA), cothromboplastin
Extrinsic
VIII Antihemophiliac factor A,
antihemophilic globulin (AHG) Intrinsic
IX Christmas Factor, antihemophilic factor
B,plasma thromboplastin component (PTC)
Intrinsic
X Stuart-Prower Factor Both
XI Plasma thromboplastin antecedent
(PTA) Intrinsic
XII Hageman Factor Intrinsic
XIII Protransglutaminase, fibrin stabilizing
factor (FSF), fibrinoligase Both
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Fibrinogen I FibrinThrombin IIa
Prothrombin II
XaVa
VIIa
TF IIIa
Extrinsic Pathway (PT)
IXa
VIIIa
XIa
XIIa
Intrinsic pathway (PTT)
XIIIa
Soft clot
Fibrin
Hard clot
VVIII
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FINAL STEPS - COAGULATION
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Platelet-Fibrin clot
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Minimum Fibrinogen Levels
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CRYOPRECIPITATE
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Transfusion-associated Circulatory Overload (TACO)
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FIBRINOLYSIS
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Fibrin Fibrin Split Products (FSP)Plasmin
Plasminogen
tPA (Tissue Plasminogen Activator)
Fibrinolysis
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FIBRINOLYSIS
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Antifibrinolytics
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Lysine Analog
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€Aminocaproic acid & Tranexamic acid
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Anticoagulant and Antiplatelet Drugs
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Anticoagulant and Antiplatelet DrugsMechanism of action
• Platelets Primary Hemostasis Plug
Antiplatelet Drugs:
TxA2 inhibitors: ASA
Thienopyridines (P2Y12/ ADP receptor Inhibitors ): Clopidogrel (plavix), Prasugrel (apagrel),
Ticlopidine (Ticlid)
GP IIb/IIIa Antagonists: Tirofiban (Aggrastat), Eptifibatide (Integrelin), Abciximab (ReoPro)
• Coagulation cascade Secondary Hemostasis Plug
Anticoagulants :
Indirect Thrombin Inhibitors: Coumadin, Heparin
Direct Thrombin Inhibitors: Lepirudin (Angiomax), Argatroban, Bivalirudin (Refludan), Dabigatran
(Pradaxa)Jay kambam
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ANTIPLATELET DRUGS - Mechanisms
Aspirin - Thromboxane A2 Inhibitors
Clopidogrel (Plavix)
Prasugrel (apagrel) Thienopyridines
Ticlopidine (Ticlid)
Aggrastat (tirofiban)
ReoPro (abciximab) GP IIb/IIIa Antagonists Integrilin (eptifibatide)
P2Y12/ADPReceptor Inhibitors
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Antiplatelet Drugs: Inhibition of activation &/or aggregation
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ASPIRIN
• Inhibition of Thromboxane A2 production• Orally administered• Rapidly absorbed from GIT• Peak levels observed in about 30 minutes• Irreversible COX type 1 inhibitor• Chew and do!
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Thienopyridines: TICLOPIDINE, CLOPIDOGREL & PRASUGREL
• Antiplatelet agents are used to treat, prevent arterial thrombosis.
• Thienopyridine derivatives, inactive in vitro, requiring metabolism to achieve in vivo activity.
• Inhibit binding of ADP to platelet receptor(P2Y12).
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CLOPIDOGREL
Prodrug (Thienopyridine)Administered only orallyNo direct antiplatelet activityMetabolized in the liverActive metabolite inhibits platelet aggregationPeak concentration of active metabolite is seen in 1 -2 hrsMetabolite binds to platelet P2Y12 receptor and irreversibly inhibits ADP-induced platelet aggregation
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PRASUGREL
Prodrug (Thienopyridine) Ten to 100 times more potent than clopidogrel Administered only orally No direct antiplatelet activity Metabolized in the liver more rapidly (levels 2 times higher) Faster activity Active metabolite inhibits platelet aggregation Peak concentration of active metabolite is seen in 0.5 hr Metabolite binds to platelet P2Y12 receptor and
irreversibly inhibits ADP-induced platelet aggregation
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PLATELET INHIBITORS
Aspirin - Thromboxane A2 Inhibitors
Clopidogrel (Plavix)
Prasugrel (apagrel) Thienopyridines
Ticlopidine (Ticlid)
Aggrastat (tirofiban)
ReoPro (abciximab) GP IIb/IIIa Antagonists Integrilin (eptifibatide)
P2Y12/ADPReceptor Inhibitors
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Gp IIb/IIIa ANTAGONISTS
• Platelet Gp IIb/IIIa receptors play a pivotal role in platelet-mediated thrombus formation, binding to fibrinogen,vWF & Collagen
• IIb/IIIa antagonists differ in receptor affinity, reversibility, and specificity
• GpIIb/GpIIIa antagonists more completely inhibit platelet aggregation than do ASA and Theinopyridines
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Platelet Activation Pathways
Arachidonicacid
TxA2
GP IIb/IIIa
Epine
phrin
e
Collagen ThrombinADP
P2Y12
PAR-4
GP1b
vWF
FibrinogenJay kambam
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Inactive platelet GP IIb/IIIa receptors in
unreceptive state
Inhibition of platelet aggregation
GP IIb/IIIa receptors occupied by antagonists
Agonist
ADP, thrombin, collagen, epi
GP IIb/IIIa antagonist
Fibrinogen
Aggregating platelets
GP IIb/IIIa Antagonists:Tirofiban (Aggrastat) Eptifibatide (Integrelin) Abciximab (ReoPro)
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Active Platelet
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Glycoprotein IIb/IIIa inhibitors Tirofiban (Aggrastat)
• Nonpeptide• KD 15 nmol/L
• Indication: acute coronary syndrome
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Glycoprotein IIb/IIIa inhibitors Eptifibatide (Integrelin)
• Cyclic peptide• KD 120 nmol/L
• Acute coronary syndrome
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Glycoprotein IIb/IIIa inhibitors Abciximab (ReoPro)
• Human/murine chimeric monoclonal antibody Fab
• KD 5 nmol/L
• Indication: PCI
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Anticoagulant and Antiplatelet Drugs
• Platelets Primary Hemostasis Plug
Antiplatelet Drugs: TxA2 Inhibitors: ASA
Thienopyridines: Clopidogrel, Prasugrel, Ticlopidine;
GP IIb/IIIa Antagonists: Tirofiban (Aggrastat), Eptifbatide (Integrelin), Abciximab (ReoPro)
• Coagulation cascade Secondary Hemostasis Plug
Anticoagulants: Indirect Thrombin Inhibitors: Coumadin, Heparin
Direct Thrombin Inhibitors: Lepirudin, Argatroban, Bivalirudin, Dabigatran Jay kambam
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Anticoagulants:Direct & indirect antithrombin drugs
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ANTICOAGULANTS
Indirect Thrombin Inhibitor Drugs:• Vitamin K antagonists, Coumadin (in vivo only)• Ca++ chelators (in vitro only)
– EDTA, Citrate, Oxalate
• Heparin (in vivo and in vitro)
Direct Thrombin Inhibitor Drugs: Bivalirudin (Refludan), Lepirudin (Angiomax), Argatroban (Acova) Dabigatran (Pradaxa)*
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Role of vitamin K
Some clotting factors require a post-translational modification (PTM) before they are active in clotting
These factors are II, VII, IX, X
This PTM involves the addition of a COO- to certain Glu residues in the clotting factors
This PTM results in the formation of several g-carboxy glutamates = Gla
This PTM requires vitamin K
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HEPARIN - SOURCES
• Lungs• Liver• Intestinal mucosa• Mast cells of RES• Bovine and Porcine
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HEPARIN - STRUCTURE
One of the strongest acids Heavily sulfated polyanionic mucopolysaccharide Mol Wt: 6000-25000 Daltons Similar to nucleic acids (Phosphates)
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HEPARIN - PROPERTIESAction begins immediatelyPeaks in 2 - 5 minDistribution volume - small (plasma, RES)**
Dose: Adult 3-4mg/kg; Child: 1-3mg/kgDuration of action - 60-90 min in normothermic
bypass; prolonged with hypothermia
Acute Side effects: vasodilatation
** ideal body weight
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HEPARIN - MECHANISM OF ACTION
• Heparin is not a direct anticoagulant• Heparin activates antithrombin III• Heparin + antithrombin III (Beta Globulin)
Heparin-antithrombin III complex (HATC)• HATC induces anticoagulation by inhibiting four
coagulation activating factors (aII, aIX, aX, and aXI). HATC, in particular, inhibits thrombogenic actions of activated thrombin (aII) and factor X (aX)
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HEPARIN RESISTANCE
• Heparin resistance is usually defined as failure to achieve a target ACT (>450 seconds) after administration of heparin up to 6 mg or 600 units/Kg body weight.
Possible causes:• a . ATIII deficiency (congenital or acquired)• b. Arteriosclerotic disease • c. Septicemia • d. Pregnancy • e. Birth control pills• f. Liver disease• g. Prolonged anticoagulant therapy• h.Thrombocytosis • i. Nephrotic Syndrome
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HEPARIN RESISTANCE
• Since the likely cause is ATIII deficiency:
the treatment options are:– Give ATIII 50 units /kg – and or 2-4 units of FFP
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Heparin Induced Thrombocytopenia (HIT Syndrome)
Immune-mediated allergic reaction to heparin/platelet factor 4 complexThrombocytopenia:
Platelet count <150,000 or a 30% to 50% drop from baseline during heparin exposureOnset 5 to 14 days after initiating heparin but can be earlier or laterWith or without thrombotic complications at presentation
Diagnosis is clinicalAny type of heparin or route of administration can lead to HIT
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Temporal Patterns of Thrombocytopenia in HIT
Day 1 Day 5 Day 14 Day 30
Delayed-Onset HIT
(9-40+ days)
Rapid-onset HIT
(hours-days)
Typical-Onset HITMean day 9(5-14 days)
Heparin (re) Exposure
THROMBOCYTOPENIA (± THROMBOSIS)
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Incidence of HIT
HIT occurs in up to 5% of patients receiving unfractionated heparin (UFH)
Up to 1% incidence with low molecular weight heparin (LMWH)
Mortality rate of 22% to 28% has been reported in patients with HIT associated with thrombosis not treated with alternative anticoagulation.
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HEPARIN ALTERNATIVESDirect Thrombin Inhibitors
• Bivalirudin (Refludan)• Lepirudin (Angiomax)• Argatroban (Acova)• The best choice depends on patient’s
health status (hepatic or renal function)• Dabigatran (Pradaxa)*
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Diagnosis and Management Decisions for HIT
• Current or recent heparin exposure with thrombocytopenia
• Presence of thrombosis or other characteristic sequelae
• If HIT is suspected, discontinue all forms of heparin IMMEDIATELY: Initiate alternative anticoagulant, as indicated
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Dabigatran (Pradaxa)
Direct thrombin inhibitor-oral anticoagulant, Half Life: 13-27hrs, Does not require frequent blood tests for International normalized Ratio (INR) monitoring Not highly protein bound, excreted 80% via kidneys & 20% via bile, partially through
hemodialysis There is no specific way to reverse the anticoagulant effect of dabigatran in the event of
a major bleeding event, unlike warfarin. Dosage upto 150 mg twice daily? The (FDA) approved Pradaxa on October 19, 2010, for prevention of stroke in patients with non-valvular atrial fibrillation On February 14, 2011, the ACC & AHA added dabigatran to their guidelines for managment of non-valvular atrial fibrillation with a class I recommendation aPTT (activated partial thromboplastin time), ECT (Ecarin clotting time), TT (Thrombin time)
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Dabigatran Discontinuation before surgery
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PLATELET ADHESION
VASOCONSTRICTION INITIAL RELEASE REACTION ADP
SEROTONIN PLATELET AGGREGATION
PHOSPHOLIPIDS INCREASED RELEASE REACTION ADP
COAGULATION
SECOND HEMOSTATIC PLUG FIRST HEMOSTATIC PLUG
(FIBRIN PLUG) (PLATELET PLUG)
HemostasisVessel Injury
Platelet-fibrin clot FSP
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EndothelinCollagen, vWF
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Anticoagulant and Antiplatelet DrugsMechanism of action
• Platelets Primary Hemostasis Plug
Antiplatelet Drugs:
TxA2 inhibitors: ASA
Thienopyridines (P2Y12/ ADP receptor Inhibitors ): Clopidogrel (plavix), Prasugrel (apagrel),
Ticlopidine (Ticlid)
GP IIb/IIIa Antagonists: Tirofiban (Aggrastat), Eptifibatide (Integrelin), Abciximab (ReoPro)
• Coagulation cascade Secondary Hemostasis Plug
Anticoagulants :
Indirect Thrombin Inhibitors: Coumadin, Heparin
Direct Thrombin Inhibitors: Lepirudin (Angiomax), Argatroban, Bivalirudin (Refludan), Dabigatran
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Normal hemostasis is a complex interaction between vessel wall, platelet function, plasmatic coagulation, and fibrinolysis.
Causes of perioperative coagulopathy and bleeding are multifactorial – Not addressed in this lecture
Fibrinogen is in the key position of coagulation cascade and fibrinolytic pathway.
Understanding the process of perioperative hemostasis and pharmacodynamics of drugs involving hemostasis is essential
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Perioperative HemostasisOptimize coagulation & reduce fibrinolysis
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Stupid Monkey drinking my coffee@Kilimanjaro, Kenya
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HISTORICAL ACHIEVEMENTSDATE ACHIEVEMENT Miescher - 1868 Discovered protamine in salmon
gonads Kossel - 1896 Isolated protamines from various
kinds of fish McClean - 1916 Discovered heparin’s
anticoagualtion action Hagedorn - 1930’s Made long-acting insulin with
protamine Jaques, McCutcheon - 1930’s Produced heparin-protamine
complex Chargoff, Olson - 1937-38 Discovered heparin’s antidote Walther - 1939 Reported protamine’s adverese
effects Jaques - 1949 Poineered study of protamine’s
toxic effects Hersley - 1966 Developed ACT test Jaques - 1973 Developed hep-prot titration test
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Platelet Alterations During & After CPB
2. Changes Affecting Platelet Aggregation:
a) Decreased ability of Platelet Aggregation to Agonists
b) Platelets are Activated by CPB (20-30% Spent)
c) Platelets bind to Monocytes and Neutrophils
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Platelet Alterations During & After CPB
3. Changes Affecting Clot resistance to Clot lysis by Plasmin:
Preactivation of Platelets Leads to Depletion of Plasmin Inhibitors (stored in platelets) which are Critical to protecting the clot from lysis by the Plasmin
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TICOLPIDINE/CLOPIDOGREL
In CAD stenting, ticlopidine reduces risk for subacute stent thrombosis
Clopidogrel reduces ischemic events with recent MI, stroke, or PVD
Clopidogrel + aspirin in stenting, is rapidly growing, given before stenting procedure
Bleeding variability for cardiac surgery relates to the duration of therapy
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Heparin Manufacturing Process
• Combine 5000 lbs intestines, 200 gallons water, 10 gallons chloroform, and 5 gallons toluene. Hold at 900 F for 17 hrs.
• Add 30 gallons acetic acid, 35 gallons ammonia, sodium hydroxide to adjust pH, and 235 gallons water. Bring to a boil then filter.
• Add 200 gallons hot water to filtrate and allow to stand overnight, then skim off the fat.
• Keep pancreatic extract at 1000F for three days, then bring to boil.
• Filter solids and assay for heparin content.
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Heparin source comparison
BOVINE LUNG PORCINE MUCOSAL
Cost Less More
Mol Wt (Daltons) 5000-20,000 6000-30,000
Chemical structure Shorter chains Longer chains
Platelet aggregation ++ +
Thrombin inhibition Less More
Factor aX inhibition More Less
Post op bleeding More Less
Protamine requirement Less More
Delayed thrombocytopenia ++ +
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Bivalirudin (Refludan)
• Half Life 25 min• Reversal: None • Metabolism: Renal > Hepatic• Monitoring ACT, ECT (Ecarin Clotting Time )• Dosage 1.5 mg/kg bolus, then continuous infusion
at 2.5 mg/kg /h • Other: Titrate ACT > 500
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Lepirudin (Angiomax)
• Half life: 30 min • Reversal: None• Metabolism: Hepatic > Renal• Monitoring PTT, ACT • Dosage 0.1 mg /kg bolus then 5-10 ug/kg/min• Other: Incidence of Hypercoagulable state after
DC the continuous infusion
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Argatroban (Acova)
• Half life 80 min• Reversal: None• Metabolism: Renal• Monitoring PTT, ECT (Ecarin Clotting Time)• Dosage 0.25 mg/kg , then 0.5 mg /min infusion• Other: Increase incidence of post-op bleeding.
Incidence of anaphylaxis with the second exposure
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