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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 |