Tachycardia induction due to inappropriate implantable cardioverter defibrillator therapy: what is the mechanism?

Antitachycardia therapies administered by implantable cardioverter defibrillators (ICDs) can occasionally prove proarrhythmic due to induction of ventricular tachyarrhythmias. In this report we present the case of a tachycardia induction as a result of inappropriate therapy delivery in an ICD recipient. Detailed analysis of the stored electrograms facilitated the delineation of the underlying mechanism of the recorded tachycardia.