User Manual

Programming requirement:
The pacemaker cannot be programmed to bipolar configuration if a bipolar lead is not
connected (measurement of the impedance determines the type of lead present when
programming to bipolar configuration).
REFRACTORY PERIODS
Post R and Post V Atrial Blanking, committed period, automatic AV delay and AVD
paced/sensed offset are not available for the SR model.
Absolute refractory periods: post R and post V Atrial Blanking
Absolute atrial and ventricular refractory periods are initiated by any sensed or paced
ventricular or atrial event. These periods are composed of an absolute Refractory Period and
a retriggerable Refractory Period.
The duration of the refractory periods lengthens automatically as needed.
Post R and Post V Atrial Blanking special case:
For the DR model: Post R and Post V Atrial Blanking are absolute refractory periods that are
programmable.
Committed period (for the DR model only)
In dual-chamber pacing modes, atrial pacing may be sensed by the ventricular sensing
circuits, and may inhibit ventricular pacing. The pacemaker is protected against this
phenomenon (called Crosstalk) by the committed period.
Automatic AV delay (for the DR model only)
The AV delay is the programmable time interval between atrial sensing or pacing and
ventricular pacing.
In DOO and DDI mode, only the rest AV delay is programmable. In DDD mode, rest and
exercise AV delays are programmable.
The rest AV delay is used at the programmed basic rate. The exercise AV delay is used
at the programmed maximum rate. Between basic rate and maximum rate, the AV delay is
calculated at each cycle by the pacemaker on the basis of a linear relationship between the
AV delay and the atrial rate.
A fixed AV delay may be obtained by programming the rest AV delay equal to the exercise
AV delay.
15.4.
15.4.1.
15.4.2.
15.4.3.
15. FUNCTIONS AND PARAMETERS
40 ALIZEA – UA10414A