A Permanently Implanted Endocardial Electrode Complicating Ventricular Tachycardia with A Second VT

A VVI pacemalter was permanently implanted for the purpose of suppressing recurrent ventricular tachycardia (VT). Not only did the device fail to suppress the VT, but also the permanent endocardial electrode caused a second VT which was more rapid and clinically more severe. When a new VT occurs in the presence of a permanently implanted ventricular pacing system, the implanted electrode should he considered as one of the possible etiologic causes for the VT.