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Anticoagulant Drugs: Low-Molecular-Weight Heparins01:30

Anticoagulant Drugs: Low-Molecular-Weight Heparins

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...
Anticoagulant Drugs: Vitamin K Antagonists and Direct Oral Anticoagulants01:18

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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...
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Comprehensive Analysis of Procoagulant Platelets Exhibiting Features of Necrosis, Apoptosis and Platelet Activation
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Excessive anticoagulation with warfarin or phenprocoumon may have multiple causes.

Peter M Meegaard1, Line H V Holck, Anton Pottegård

  • 1Research Unit of Clinical Pharmacology, University of Southern Denmark, Winsløvparken 19, 2., 5000 Odense C, Denmark.

Danish Medical Journal
|February 2, 2012
PubMed
Summary

Excessive anticoagulation from vitamin K antagonists is a serious risk. Disease and drug-drug interactions, particularly with paracetamol and tramadol, are the most common causes identified in this study.

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Area of Science:

  • Pharmacology
  • Clinical Medicine
  • Patient Safety

Background:

  • Excessive anticoagulation with vitamin K antagonists poses significant risks.
  • Understanding the causes of excessive anticoagulation is crucial for patient safety.

Purpose of the Study:

  • To characterize the underlying causes of excessive anticoagulation in patients.
  • To identify common factors contributing to elevated international normalized ratio (INR) levels.

Main Methods:

  • Retrospective and prospective identification of patients with INR > 6.5 or INR > 3.5 and bleeding.
  • Review of patient charts for potential causes including drug-drug interactions, alcohol abuse, disease, dosage changes, and errors.

Main Results:

  • Causal events were identified in 86 out of 107 admissions.
  • The most frequent causes were disease (44 admissions) and drug-drug interactions (42 admissions).
  • Common drug-drug interactions involved paracetamol and tramadol.

Conclusions:

  • Frequent INR monitoring during illness and increased awareness of drug-drug interactions are key areas for intervention.
  • Reducing excessive anticoagulation requires a multifaceted approach focusing on patient management and medication review.