Local Anticoagulation
Local Anticoagulation - Related Videos
07:08
Assessment of the Anticoagulant and Anti-inflammatory Properties of Endothelial Cells Using 3D Cell Culture and Non-anticoagulated Whole Blood
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Cited by 6 •
2017
We present an in vitro model which allows the study and analysis of coagulation in whole, non-anticoagulated blood. Anticoagulation in the system depends on the natural anticoagulation effect of healthy endothelial cells and endothelial cell activation will result in clotting.
01:18
Anticoagulant Drugs: Vitamin K Antagonists and Direct Oral Anticoagulants
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2024
Oral anticoagulants are vital tools in preventing and treating blood clotting disorders. This diverse class of medications can be categorized as vitamin K antagonists, exemplified by warfarin, and direct thrombin inhibitors (DTIs), such as dabigatran, as well as factor Xa inhibitors, including rivaroxaban. Warfarin, a prominent vitamin K antagonist family member, exerts its effect by inhibiting the enzyme VKORC1 (vitamin K epoxide reductase complex 1). By hindering this enzyme, warfarin...
11:17
Rapid Point-of-Care Assay of Enoxaparin Anticoagulant Efficacy in Whole Blood
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2012
Demonstration of a rapid quantitative assay of the inhibition of blood coagulation by the low-molecular-weight-heparin, enoxaparin. The contribution of enoxaparin is assessed by removing its influence through digestion with heparinase. A fuller description of the assay is detailed in our published paper.1 The assay still requires clinical confirmation.
01:30
Anticoagulant Drugs: Low-Molecular-Weight Heparins
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2024
Hemostasis is a crucial process that prevents excessive blood loss from damaged blood vessels. It involves various mechanisms such as vasoconstriction, platelet adhesion and activation, and fibrin formation. The importance of each mechanism depends on the type of vessel injury. In contrast, thrombosis is the abnormal formation of a blood clot within the blood vessels, leading to potential complications if the clot obstructs blood flow. Thrombosis can be caused by increased coagulability of the...
13:13
Nano-fEM: Protein Localization Using Photo-activated Localization Microscopy and Electron Microscopy
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Cited by 14 •
2012
We describe a method to localize fluorescently tagged proteins in electron micrographs. Fluorescence is first localized using photo-activated localization microscopy on ultrathin sections. These images are then aligned to electron micrographs of the same section.
FAQs
Citrate works by binding ionized calcium, which functions as an essential cofactor in the coagulation cascade. Removing available ionized calcium from the circuit interferes with the reactions needed for clot formation there. This biochemical action allows blood to remain less prone to clotting while it passes through the extracorporeal pathway, supporting continued circuit function during treatment.
The key distinction is where anticoagulant activity is intended to occur. Local anticoagulation focuses the clot-prevention effect within a targeted blood-contacting area, whereas systemic exposure is not the treatment goal. That distinction matters when clinicians need circuit patency but also want to minimize anticoagulant effects throughout the patient’s body, particularly when bleeding risk is a concern.
Citrate binding changes the availability of ionized calcium within the circuit, so calcium must be replaced before or after blood returns to the patient. Replacement helps restore calcium availability outside the targeted anticoagulated area. Its timing is therefore part of the technique, not an optional add-on, and it must be coordinated with monitoring during treatment.
Safe application depends on three complementary observations: whether the circuit continues to perform, the patient’s ionized calcium status, and acid-base status. Circuit performance indicates whether clotting is interfering with treatment, while calcium and acid-base measurements help assess physiologic effects of the strategy. Reviewing these findings together supports safer application of therapy.
During continuous renal replacement therapy or hemodialysis, citrate is introduced into the extracorporeal circuit rather than treating the entire circulation as the target. Calcium is then replaced before or after blood returns to the patient. The procedure therefore links circuit anticoagulation with calcium management and repeated assessment of circuit performance, ionized calcium, and acid-base status.
It may be considered when a procedure requires blood to move through an extracorporeal circuit but systemic anticoagulation could increase bleeding risk. The overview identifies continuous renal replacement therapy and hemodialysis as relevant settings. More broadly, the approach supports individualized treatment decisions by balancing circuit function against the desire to limit anticoagulant effects throughout the body.