Abstract: An electrophysiology (EP) study system using an implantable cardioverter/pace. The system includes an implantable unit having a conventional programmable pace capable of operation in at least the VVT mode. The implantable unit transmits ECG data, in real time, externally of the patient and receives pacing pulse signals from an external unit. The pacing pulse signals are detected and provided to a trigger input of the pacer placed in the VVT mode. Simultaneously, the ECG data is transmitted to the external unit. The external unit detects the ECG data and provides the data to a conventional programmable electrical stimulator. The stimulator pacing pulse output is transmitted to the internal unit and provided to the trigger input of the pacer.