User's Manual

29
Pacing Types – Modes
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Triggered Pacing
Triggered pacing modes correspond to the respective demand modes,
the difference being that detection of an atrial/ventricular event
outside the refractory period does not cause pulse inhibition, but
rather triggers immediate pulse delivery to the respective chamber.
The corresponding pacing modes are:
Demand: DDD VDD DDI DVI AAI VVI
Triggered: DDT
DDT/A
DDT/V
VDT DDI/T DVT AAT VVT
However, the following differences do occur: There is no AV safety
delay in the DDT, DDI/T and DV T pacing modes. It is not necessary
since ventricular pulse inhibition because of crosstalk (ventricular
sensing of the atrial pacing pulse) cannot occur in these modes.
In the DDI/T and DV T pacing modes, the basic interval is not restarted
if ventricular sensing occurs within the AV delay.
DDT/A Mode, DDT/V Mode
The DDT/A and DDT/V modes are derived from the DDT mode. In
DDT/A mode, the pacemaker delivers a pulse in the atrium after every
sensed atrial event and inhibits pacing in the ventricle if required.
Similarly, in DDT/V mode, an immediate pulse in the ventricle, and if
required pulse inhibition in the atrium, follows every sensed ventricular
event.