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68 Stratos LV/LV-T Technical Manual
2.1.6 AAI and VVI
The pacing modes AAI and VVI provide atrial and ventricular
demand pacing. The lower rate timer is started by a sense or
pace event. A sense event outside of the refractory period
inhibits pacing and resets the lower rate timer; in the absence of
a sense event, a pulse generator pulse will be emitted at the end
of the lower rate interval.
2.1.7 AAI, VVI
The AAI and VVI single-chamber pacing modes are used in atrial
and demand pacing. In each case, pacing and sensing only
occur in the atrium (AAI) or the ventricle (VVI).
The basic interval is started by a sense or pace event. If the
sense event occurs before the basic interval has expired, pacing
is inhibited. Otherwise, pacing occurs at the end of the basic
interval.
2.1.8 AOO, VOO
In these modes, atrial, ventricular and AV sequential pulses,
respectively, are emitted asynchronously. These modes
primarily serve diagnostic purposes during follow-up. When
programming to the VOO or VOO mode, the risks associated
with asynchronous ventricular pacing should be considered.
2.1.9 DOO
Asynchronous, AV sequential pacing pulses are emitted in this
pacing mode. When programming DOO mode, the risks of
asynchronous ventricular pacing should be considered.
2.1.10 VDI
The VDI mode corresponds to the VVI mode, with the additional
function of providing atrial sensing. However, the timing is the
same as the VVI mode. The purpose of the VDI mode is to
permit the use of the marker function with the IEGM for the atrial
channel, for example, to measure the retrograde conduction
time.
The VA conduction time between a ventricular pace or sense
event (with marker) and the atrial sense event can be measured
directly on the display or printout from the programmer or on an
ECG strip chart recorder (IEGM/marker output function).