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Anticoagulation after valve replacement: a multicenter retrospective study.

T Kudo1, M Kawase, S Kawada

  • 1Department of Cardiovascular Surgery, Hachioji Medical Center, Tokyo Medical University, Japan.

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|February 23, 1999
PubMed
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The current therapeutic range for PT-INR (prothrombin time international normalized ratio) may be too high for Japanese patients with mechanical heart valves. Further research is needed to establish an optimal PT-INR range for this population.

Area of Science:

  • Cardiology
  • Vascular Surgery
  • Pharmacology

Background:

  • Anticoagulant therapy is crucial for patients with mechanical heart valves to prevent thromboembolic events.
  • The established therapeutic range for PT-INR (prothrombin time international normalized ratio) may not be universally applicable across diverse patient populations.

Purpose of the Study:

  • To retrospectively evaluate the effectiveness of current anticoagulant therapy in Japanese patients after cardiac valve replacement.
  • To assess the PT-INR (prothrombin time international normalized ratio) values associated with thromboembolic and bleeding complications in this cohort.

Main Methods:

  • Retrospective analysis of 1,200 patients undergoing cardiac valve replacement in the Tokyo area.
  • Monitoring of prothrombin time international normalized ratio (PT-INR) levels in relation to thromboembolic and bleeding events.

Related Experiment Videos

  • Data collected as part of the Tokyo Area Study on Anticoagulation After Cardiac Valve Replacement Using PT-INR (TAS).

    • Main Results:

    • Thromboembolic complications occurred in 21 patients and bleeding complications in 15 patients.
    • A significant proportion of patients experiencing thromboembolism (71%) and bleeding (47%) had PT-INR levels within the accepted Japanese therapeutic range of 1.6 to 2.8.
    • These findings suggest a potential mismatch between the current therapeutic range and optimal anticoagulation for Japanese patients.

    Conclusions:

    • The current PT-INR (prothrombin time international normalized ratio) therapeutic range of 1.6 to 2.8 may require re-evaluation for Japanese patients with mechanical heart valves.
    • Prospective data from the ongoing TAS trial are necessary to determine a more appropriate PT-INR therapeutic range for this population.