Stratos LV/LV-T Technical Manual 63

2. Programmable Parameters

For a complete list of programmable parameters and the available settings for the Stratos CRT-Ps, see Section 11.

2.1Pacing Modes

For a complete list of pacing modes available in each Stratos CRT-P configuration, see Section 11.1.

2.1.1 Rate-adaptive Modes

The rate-adaptive modes are designated with an “R” in the fourth position of the NBG pacemaker code on the programmer screen. The rate-adaptive modes function identically to the corresponding non-rate-adaptive modes, except that the basic rate increases when physical activity is detected by the motion sensor.

In demand modes (i.e., DDDR, DDIR, DVIR, VDDR, VVIR, AAIR), it is possible that the atrial and/or ventricular refractory period can comprise a major portion of the basic interval at high sensor-modulated rates. This may limit the detection of spontaneous events or even exclude their recognition altogether.

WARNING

Rate Adaptive Pacing – Use rate-adaptive pacing with care in patients unable to tolerate increased pacing rates.

2.1.2 DDD

The timing of the Stratos CRT-Ps is based on atrial events.

In the case of an atrial sensed or paced event, the AV delay starts the same time as the basic interval. If a ventricular sensed event does not occur within the AV delay, ventricular pacing is initiated at the end of the AV delay. If ventricular sensing occurs within the AV delay, ventricular pacing is inhibited.

If atrial sensing occurs outside the atrial refractory period, atrial pacing is inhibited and the basic interval is restarted.