Use of ECG Restitution (Beat‐to‐Beat QT‐TQ Interval Analysis) to Assess Arrhythmogenic Risk of QTc Prolongation with Guanfacine

Guanfacine (Intuniv) is a centrally active alpha‐2A adrenergic agonist for the new indication of attention‐deficit/hyperactivity disorder. QTc (QTcF and QTcNi) was prolonged at both therapeutic (4 mg) and supratherapeutic (8 mg) doses of a thorough QT study even though guanfacine has had a safe clinical history of over 3 million prescriptions for the treatment of hypertension. In an attempt to understand this disparity, retrospective evaluation of the continuous ECG data utilized dynamic beat‐to‐beat and ECG restitution analyses was performed.

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