Comparison of Electrocardiographic Biomarkers for Differentiating Drug‐induced Single vs. Multiple Cardiac Ion Channel Block

Abstract

Since introduction of the ICH proarrhythmia guidelines in 2005, no new marketed drugs have been associated with unacceptable risk of TdP. Although cardiac safety improved, these guidelines had the unintended consequence of eliminating potentially beneficial drugs from pipelines early in development. More recently, it has been shown that a QTc prolonging drug may be safe if it impacts multiple ion channels vs. only hERG and that this effect can be discriminated using QT subintervals. We compared the predictive power of four ECG repolarization metrics to discriminate single vs. multichannel block: a) traditional 10‐sec signal‐averaged triplicates, and b) three metrics that employed increasing density of automatically measured beat‐to‐beat (btb) intervals. Predictive power was evaluated using logistic regression and quantified with receiver operating characteristic area under the curve. Compared to the traditional 10‐sec signal averaged triplicates, the reduction in classification error ranged from two to six with increasing density of btb measurements.

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