Implantable cardioverter defibrillator proarrhythmia due to an interaction with "noncompetitive atrial pacing": an algorithm to prevent atrial arrhythmias.

An episode of device related proarrhythmia observed with a dual chamber ICD is reported. Ventricular tachycardia was induced due to an inappropriate interaction of programmed device settings with automatic algorithms, including noncompetitive atrial pacing (NCAP), an algorithm used to prevent atrial tachyarrhythmias.