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Relationship between serum bepridil concentration and corrected QT interval.

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    High serum bepridil concentration is linked to prolonged QT intervals. Monitoring bepridil levels is crucial to prevent dangerous heart rhythm changes like torsade de pointes.

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    Area of Science:

    • Cardiology
    • Pharmacology
    • Clinical Medicine

    Background:

    • Bepridil is known to prolong the QT interval, potentially inducing torsade de pointes.
    • The precise relationship between serum bepridil concentration and QT prolongation remains unclear.

    Purpose of the Study:

    • To investigate the association between serum bepridil concentration and the corrected QT (QTc) interval in patients treated with bepridil.

    Main Methods:

    • Retrospective study of 60 patients with atrial fibrillation treated with bepridil.
    • Analysis of serum bepridil concentrations and electrocardiogram data collected over 21 days post-initiation.

    Main Results:

    • A significant increase in mean QTc interval was observed after bepridil initiation.
    • Both bepridil dose and serum concentration significantly correlated with QTc interval.
    • Patients with QTc prolongation (≥500 ms) had significantly higher serum bepridil concentrations.

    Conclusions:

    • Serum bepridil concentration is significantly associated with QTc interval prolongation.
    • Concentrations exceeding the therapeutic range may be a critical risk factor for QTc prolongation.