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anticoagulant
clinical med quiz
Question | Answer |
---|---|
inhibits synthesis of vitamin K dependent clotting factors by the liver that stimulate prothrombin production | coumadin |
activates antithrombin which indirectly blocks thrombin -made from pig or bovine mucosa | heparin |
thrombin inhibitor, processed heparin, chemically consistent | lovenox |
INDIRECTLY inhibits factor Xa | arixtra |
DIRECTLY inhibit factor Xa | xarelto |
direct thrombin inhibitor | pradaxa |
prevent platelets from clumping together to form a clot by various mechanisms | antiplatelets |
inhibits an enzyme that causes platelet clumping | aspirin (NSAIDS) |
inhibits two enzymes that cause platelets to clump | aggrenox |
used only in the hospital as part of combination therapy for acute coronary disease | monoclonal antibodies / glycoprotein inhibitors: ReoPro, Integrilin, Aggrastat |
block ADP receptors on the platelet surface to prevent clumping | Thienopyridines: ticlid, plavix, effient |
can cause coagulation disorders | Thienopyridines: ticlid, plavix, effient |
plavix effect can be reduced by PPI's | Thienopyridines: ticlid, plavix, effient |
dont dissolve clots dont thin blood | anticoagulants |
work by interfering with the bodys ability to clot by reducing the activity of certain proteins (clotting factors) | anticoagulants |
given to prevent clotting or treat existing clots by stabilizing them & preventing embolisms | anticoagulants |
monitor PT & INR | coumadin |
takes 96+ hrs for onset of action | coumadin |
therapeutic ranges: 2-3 for most 2.5 -3.5 for higher risk (valves, MI) | coumadin |
if > 4.0 high bleeding risk & no more therapeutic benefit | coumadin |
given orally | coumadin & xarelto |
reversed by vitamin K or fresh frozen plasma | coumadin |
unpredictable blood levels & highly individual response | heparin |
requires frequent monitoring of aPTT | heparin |
risk of HIT when body form antibodies against, check platelets | heparin |
given IV or SQ | heparin |
reversed by protamine | heparin |
MORE predictable plasma levels & therapeutic response | lovenox |
longer half-life so can be given daily or BID | lovenox |
monitoring PTTs is not needed or accurate | lovenox |
given SQ | lovenox & arixtra & heparin |
partially reversed by protamine | lovenox |
predictable plasma levels & therapeutic response | arixtra & xarelto |
do not require lab monitoring | arixtra & xarelto & lovenox |
monitor platelets | arixtra & heparin |
no antidote, may need dialysis | arixtra & pradaxa |
has to be taken twice daily | pradaxa |
no lab monitoring possible | pradaxa |
dangerous due to no reversal agent & delayed recovery of normal clotting, wait it out | pradaxa |