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Related Experiment Videos

Coagulation studies in rheumatic heart disease.

J L Toy, D A Lederer, A T Tulpule

    British Heart Journal
    |March 1, 1980
    PubMed
    Summary

    Rheumatic mitral valve disease patients exhibit increased blood clotting tendency in the left heart, especially during exercise. This contrasts with aortic valve disease patients, suggesting a specific thrombotic risk in mitral valve conditions.

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    Area of Science:

    • Cardiovascular Medicine
    • Hematology
    • Thrombosis Research

    Background:

    • Rheumatic mitral valve disease (RMVD) is often associated with thrombotic emboli.
    • Understanding the hemostatic differences in RMVD is crucial for risk stratification.

    Purpose of the Study:

    • To investigate the clotting characteristics of pulmonary and systemic blood in patients with RMVD and atrial fibrillation.
    • To compare these characteristics with patients having aortic valve disease in sinus rhythm.
    • To identify a hemostatic basis for the thrombotic tendency in RMVD.

    Main Methods:

    • Studied 10 patients with RMVD and 7 with aortic valve disease.
    • Assessed platelet function, partial thromboplastin time, factor VIII, and platelet adhesiveness/aggregability.
    Keywords:
    BiologyBlood Coagulation Effects--complicationsCardiovascular EffectsDiseasesExaminations And DiagnosesHeart DiseasesHematological EffectsHemic SystemIn VitroLaboratory Examinations And DiagnosesLaboratory ProceduresPhysiologyPlatelet Aggregation

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  • Measured hemostatic factors in pulmonary and systemic arterial blood at rest and during exercise.

    • Main Results:

    • Patients with RMVD showed altered platelet aggregation between pulmonary and systemic blood, varying with rest and exercise.
    • Aortic valve disease patients consistently had higher platelet aggregation in systemic than pulmonary arterial blood.
    • RMVD patients exhibited changes in blood coagulation (shortened partial thromboplastin time) and increased factor VIII and platelet activity during exercise in specific blood compartments.

    Conclusions:

    • RMVD patients demonstrate an increased thrombotic tendency in left heart blood, particularly during exercise.
    • These hemostatic changes in RMVD differ significantly from those observed in aortic valve disease.
    • The findings suggest a specific prothrombotic state in the left heart circulation of RMVD patients.