A system in combination with a stimulator system and an electrophysiology recorder system in delivering a stimulator signal to a subject's heart is provided. The electrophysiology recorder system can be generally operable to acquire an electrocardiogram from the subject's heart. The system can include an electrical couple in electrical connection between the simulator system and the electrophysiology recorder. The electrical couple can be configured to communicate the stimulator signal without loading an impedance of the electrophysiology recorder system on the stimulator system.
