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Patient
Same patient as previous tracing; device programmed to DDD mode 70 bpm;
Trace
Atrial unipolar pacing (high-amplitude stimulus) and ventricular unipolar pacing after a fixed atrioventricular delay;
Trace
Repeated AP-VP cycles (atrial and ventricular pacing) at 70 bpm;
Exergue
DDD mode is designed to respond to the characteristics presented by all implanted patients as a whole but may be associated with a high percentage of deleterious ventricular pacing in patients with preserved atrioventricular conduction.
The DDD mode is the standard programming mode of dual-chamber pacemakers or resynchronization devices. It ensures atrioventricular synchronization at rest as well as during exercise during sensed or paced atrial activity.