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Related Concept Videos

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

Anticoagulant Drugs: Vitamin K Antagonists and Direct Oral Anticoagulants

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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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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...
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Antiplatelet drugs emerge as frontline defenders against the insidious threat of thromboembolic diseases, where abnormal clots obstruct vital blood vessels. These drugs stand as bulwarks, inhibiting platelet aggregation and clot formation, thereby mitigating the risk of life-threatening conditions like myocardial infarction, coronary artery disease, and thrombotic strokes.
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The progression of a drug's impact can be analyzed by examining both the concentration-time course and the effect-time course. The concentration-time course is determined by the drug's half-life and is influenced by factors such as its pharmacokinetics, including absorption, distribution, metabolism, and elimination. The effect of the drug is often related to its concentration in the plasma and is calculated using the maximum drug effect and the plasma concentration that generates 50...
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Extrinsic and Intrinsic Pathways of Hemostasis01:20

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Blood clotting or coagulation involves extrinsic and intrinsic pathways, which ultimately merge into the common pathway, forming a fibrin clot.
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  1. Home
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  9. Thermodynamics And Statistical Physics
  11. Comparison Of Clot Waveform Analysis With Or Without Adjustment Between Prothrombin Time And Activated Partial Thromboplastin Time Assays To Assess In Vitro Effects Of Direct Oral Anticoagulants.
  1. Home
  3. Research Domains
  5. Physical Sciences
  7. Classical Physics
  9. Thermodynamics And Statistical Physics
  11. Comparison Of Clot Waveform Analysis With Or Without Adjustment Between Prothrombin Time And Activated Partial Thromboplastin Time Assays To Assess In Vitro Effects Of Direct Oral Anticoagulants.

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In Vitro Thrombosis Test for Ventricular Assist Devices
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Comparison of clot waveform analysis with or without adjustment between prothrombin time and activated partial thromboplastin time assays to assess in vitro effects of direct oral anticoagulants.

Masatoshi Wakui1, Yuta Fujimori2, Yuko Ozaki2

  • 1Department of Laboratory Medicine, Keio University School of Medicine, Tokyo, Japan.

Clinica Chimica Acta; International Journal of Clinical Chemistry
|July 26, 2024

View abstract on PubMed

Summary
This summary is machine-generated.
Keywords:
Activated partial thromboplastin timeAdjustmentClot waveform analysisDirect oral anticoagulants

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Clot waveform analysis (CWA) of prothrombin time (PT) and activated partial thromboplastin time (APTT) assays revealed distinct direct oral anticoagulant (DOAC) effects. Adjusted CWA parameters showed dose-dependent decreases, aiding in understanding DOAC impact.

Area of Science:

  • Hematology
  • Pharmacology
  • Biophysics

Background:

  • Clot waveform analysis (CWA) enhances clotting time interpretation.
  • Direct oral anticoagulants (DOACs) require precise monitoring.
  • Comparing CWA in PT and APTT assays offers insights into DOAC effects.

Purpose of the Study:

  • To compare CWA between PT and APTT assays.
  • To understand the application of CWA in assessing DOAC effects.
  • To investigate the influence of DOACs on coagulation pathways.

Main Methods:

  • Plasma samples were spiked with four DOACs (rivaroxaban, apixaban, edoxaban, dabigatran).
  • CWA parameters were adjusted to compensate for fibrinogen influence.
  • Adjusted parameters were analyzed using Hill plot analysis.
Hill plot analysis
Prothrombin time

Main Results:

  • Adjusted PT-CWA parameters showed a dose-dependent decrease, unlike non-adjusted parameters.
  • Both adjusted and non-adjusted APTT-CWA parameters exhibited dose-dependent decreases.
  • DOACs showed distinct cooperative effects on PT-CWA and APTT-CWA, suggesting thrombin feedback involvement.

Conclusions:

  • DOACs exhibit distinct effects on the extrinsic (PT) and intrinsic (APTT) coagulation pathways.
  • Adjusted CWA parameters provide a clearer picture of DOAC dose-dependency.
  • Further clinical studies are necessary to confirm the clinical implications of these findings.