Abstract: A temporary transvenous pacing system for obtaining a graphical record verifying the placement of temporary cardiac pacing lead within the ventricular cavity of a heart and for intracardiac recordings for arrythmia diagnosis. The system includes a temporary transvenous pacing lead having a distal electrode which terminates in a standard connector. A physiological monitor includes sensing electrodes having at least one connector adapted for electrical connection to a body surface. An interface module includes connectors adapted to interconnect the pacing lead to the monitor, and a coupling circuit for conditioning the pacing lead signals for use by the monitor. The pacing lead signals are displayed on an oscilloscope screen of the monitor, whereby an attending physician may adjust the pacing lead position in response to the electrical waveforms so obtained.