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66 Stratos LV/LV-T Technical Manual
In the DDI/T and DVT pacing modes, the basic interval is not
restarted if ventricular sensing occurs within the AV delay.
CAUTION
Programmed to Triggered Modes – When programmed to
triggered modes, pacing rates up to the programmed upper
limit may occur in the presence of either muscle or external
interference.
Triggered Modes – While the triggered modes (DDT, DVT,
DDTR/A, DDTR/V, DDI/T, VDT, VVT, and AAT) can be
programmed permanently, these modes are intended for use
as temporary programming for diagnostic purposes. In
triggered pacing modes, pacing pulses are emitted in
response to sensed signals, and therefore the pacing pulse
can be used as an indicator, or marker of sensed events for
evaluating the sensing function of the pulse generator using
surface ECG. However, real-time telemetry of marker
channels and/or intracardiac electrogram via the programmer
and programming wand is recommended over the use of a
triggered pacing mode in the clinical setting. A triggered
pacing mode may be preferred in situations where positioning
the programming head over the pulse generator would be
impossible or impractical (i.e., during exercise testing or
extended Holter monitoring).
Another possible application of triggered modes is to ensure
pacing as a short term solution during a period of inhibition of
pacing by extracardiac interference, mechanical noise signals,
or other sensing abnormalities. Because triggered modes
emit pacing pulses in response to sensed events, this may
result in unnecessary pacing during the absolute refractory
period of the myocardium, inappropriate pacing in response to
oversensing of cardiac or extracardiac signals. The risks
associated with triggered pacing include excessive pacing,
arrhythmias due to the R-on-T phenomenon, and early battery
depletion. Therefore, it is important that the triggered modes
are not used for long term therapy, and that the CRT-P is
always returned to a non-triggered permanent program.