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Related Concept Videos

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...
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Venous thrombosis requires effective prevention and treatment strategies to improve patient outcomes and reduce potential complications.Prevention StrategiesHealthcare providers must prioritize preventing venous thromboembolism (VTE) for all adult patients upon admission. Interventions depend on bleeding and thrombosis risk, medical history, current medications, diagnoses, planned procedures, and patient preferences. Patients on bed rest should change positions every two hours and, if not...
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Related Experiment Video

Updated: Jun 20, 2026

Assessment of the Anticoagulant and Anti-inflammatory Properties of Endothelial Cells Using 3D Cell Culture and Non-anticoagulated Whole Blood
07:08

Assessment of the Anticoagulant and Anti-inflammatory Properties of Endothelial Cells Using 3D Cell Culture and Non-anticoagulated Whole Blood

Published on: September 5, 2017

Capillary bleeding under oral anticoagulation.

B Leithäuser1, C Mrowietz, B Hiebl

  • 1Department of Cardiology/Angiology, Asklepios Clinic Harburg, Hamburg, Germany. boris.leithaeuser@kabelmail.de

Clinical Hemorheology and Microcirculation
|August 29, 2009
PubMed
Summary
This summary is machine-generated.

Oral anticoagulants can cause capillary bleeding in patients, independent of INR levels. This study found no link between capillary bleeding and future clinical hemorrhages.

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Area of Science:

  • Vascular biology
  • Hematology
  • Pharmacology

Background:

  • Oral anticoagulants are crucial for preventing thromboembolism in various cardiovascular and venous conditions.
  • Hemorrhage is a significant complication, particularly with long-term or high-dose regimens.
  • Animal studies suggest coumarin anticoagulants may induce capillary damage, but human data are limited.

Purpose of the Study:

  • To investigate the occurrence of capillary bleeding in patients undergoing oral anticoagulation.
  • To determine if capillary bleeding is correlated with anticoagulation intensity (INR/Quick values).
  • To assess the prognostic value of capillary bleeding for future clinical hemorrhages.

Main Methods:

  • Video capillary microscopy was used to examine nailfold capillaries in 31 patients on oral anticoagulation and 52 controls.
  • Analysis included capillary counts, number of bleedings, and bleeding incidence per 100 capillaries.
  • Patients were followed for two years to monitor for clinically obvious bleeding events.

Main Results:

  • Capillary bleedings were observed in 74.2% of patients on oral anticoagulation, compared to 2.1% in controls (p<0.001).
  • Bleeding incidence was significantly higher in the anticoagulated group.
  • No correlation was found between capillary bleeding and INR or Quick values, nor did it predict future clinical hemorrhages.

Conclusions:

  • Capillary bleedings are demonstrable in patients using oral anticoagulants.
  • The occurrence of capillary bleeding appears independent of vitamin-K-dependent coagulation effects, suggesting other mechanisms of microvessel damage.
  • Detecting capillary bleedings does not serve as a reliable indicator for predicting future hemorrhagic events.