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Compliance and adverse event withdrawal: their impact on the West of Scotland Coronary Prevention Study

    European Heart Journal
    |December 24, 1997
    PubMed

    Insights

    High compliance with pravastatin significantly boosts its benefits, reducing coronary heart disease events and all-cause mortality. This highlights the importance of patient adherence for effective cardiovascular prevention.

    Area of Science:

    • Cardiovascular Medicine
    • Clinical Trials
    • Pharmacoeconomics

    Background:

    • The West of Scotland Coronary Prevention Study (WOSCOPS) evaluated pravastatin's efficacy.
    • Patient compliance is crucial for maximizing treatment benefits.

    Purpose of the Study:

    • To determine the additional cardiovascular risk reduction from high compliance with pravastatin.
    • To analyze adverse events leading to trial medication withdrawal.

    Main Methods:

    • Compared outcomes (coronary heart disease, mortality, revascularization, cancers) between the entire cohort and high-compliance (>75%) subgroup.
    • Adverse events causing withdrawal were systematically coded.

    Main Results:

    • High compliers (>75%) on pravastatin showed a 38% risk reduction in coronary heart disease death/myocardial infarction.
    • A 46% risk reduction in cardiovascular mortality and revascularization needs was observed.
    • All-cause mortality risk was reduced by 32% (P=0.015) in high compliers.

    Conclusions:

    • High compliance with pravastatin substantially amplifies risk reductions compared to intention-to-treat analysis.
    • Findings emphasize motivating patient adherence for improved treatment outcomes.
    • Results have implications for assessing the cost-effectiveness of statin therapy.
    Abstract

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