User's Manual

44
Timing Functions
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Sense Compensation
For hemodynamic reasons, it is desirable to maintain a constant period
between an atrial and a ventricular contraction and to adjust it to
physiologic conditions. To this end, sense compensation can be used
to shorten the AV delay after atrial sensing. You can program values of
-15 to -120 ms for the sense compensation. In this case, the AV delay
after atrial sensing is shorter than it would be following atrial pacing
according to the value you have set. The AV delay after atrial pacing
then corresponds to the programmed AV delay.
Blanking Period
Atrial Blanking Period
The atrial blanking period is started after a ventricular pace (see Figure
10). Atrial sensing does not occur during the atrial blanking period.
This prevents atrial sensing of ventricular pacing (a phenomenon
known as “crosstalk”).
Ventricular Blanking Period
The ventricular blanking period is started after an atrial pace (see
Figure 10). During the ventricular blanking period, ventricular sensing
does not occur. This prevents ventricular sensing of atrial pacing (a
phenomenon known as “crosstalk”).
Programmable Values
The following values can be programmed for the blanking periods:
• Ventricular blanking period from 16 to 72 ms
• Atrial blanking period from 32 to 72 ms