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Circulating platelet aggregate size in ischemic heart disease.

I Weinberger, J Fuchs, Z Rotenberg

    Angiology
    |September 1, 1986
    PubMed
    Summary
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    Hirulog in the treatment of unstable angina. Results of the Thrombin Inhibition in Myocardial Ischemia (TIMI) 7 trial.

    Circulation·1995

    Platelet aggregate size is significantly larger in patients with unstable angina compared to other ischemic heart disease groups. This finding highlights unique platelet behavior in unstable angina, potentially impacting diagnosis and treatment.

    Area of Science:

    • Cardiovascular Medicine
    • Hematology
    • Thrombosis Research

    Background:

    • Ischemic heart disease (IHD) encompasses conditions like stable angina, unstable angina, and acute myocardial infarction.
    • Platelet aggregation plays a critical role in the pathophysiology of IHD.
    • Understanding platelet behavior may offer insights into disease mechanisms and therapeutic targets.

    Purpose of the Study:

    • To investigate and compare platelet aggregate size across different subgroups of ischemic heart disease.
    • To determine if platelet aggregate size differs between patients with stable angina, unstable angina, and acute myocardial infarction compared to control groups.
    • To explore potential correlations between platelet aggregate size and clinical factors in IHD.

    Main Methods:

    • Platelet aggregate size was quantified in 178 IHD patients (56 stable angina, 42 unstable angina, 80 acute myocardial infarction) and compared to 50 healthy volunteers and 20 noncardiac patients.

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  • Blood samples were treated with EDTA and formaldehyde, and aggregate size was determined microscopically.
  • Aggregate size was calculated as the ratio of the number of platelets in aggregates to the number of aggregates per 1000 counted platelets.

    • Main Results:

    • Mean platelet aggregate size was comparable between control groups, patients with stable angina, and acute myocardial infarction.
    • Patients with unstable angina exhibited significantly larger platelet aggregates (4.00 +/- 1.40 platelets) compared to all other studied groups (p < 0.001).
    • Platelet aggregate size showed no significant relationship with patient sex, age, medication use, or common coronary risk factors.

    Conclusions:

    • Unstable angina presents as a distinct clinical entity within IHD regarding platelet behavior.
    • The increased peripheral platelet aggregate size in unstable angina suggests unique pathogenetic mechanisms.
    • These findings may have implications for the diagnostic evaluation and future therapeutic strategies for unstable angina.