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Patient
69-year-old man implanted with a Medtronic dual-chamber pacemaker;
Trace
Atrial and ventricular pacing in bipolar mode (small amplitude of atrial and ventricular stimuli which are sometimes unidentifiable);
Trace
Identical tracing but with atrial and ventricular pacing in unipolar mode;
Exergue
Unipolar pacing can be easily identified on the electrocardiographic tracing by the high amplitude of the stimuli. It should be noted that pacing is always bipolar in implantable defibrillators.
The vast majority of pacing leads implanted today in the right atrium or right ventricle are bipolar. On a bipolar lead, it is possible to program both pacing and sensing configurations in unipolar or bipolar mode.