User Manual Part 1

TACHYARRHYTHMIA DETECTION
VENTRICULAR DETECTION
3-9
2. The device enables a controlled pacing rate decrease to the programmed
Rhythm ID Fallback LRL. Dur ing this fallback period, the following occurs:
• The device temporarily switches the pacing mode to DDI, VDI, VVI,
AAI, or Off (according to the programmed brady mode) and extends
the AV delay up to 400 ms.
• Rate Smoothing, ATR, hysteresis, and dynamic programming
(excluding Dynamic VRP) are s uspended.
3. After the Fallback period, pacing parameters are restored to normal
programmed parameters. Fallback periods occur no more than once per
day and will typically last less than one minute.
A method for manually commanding the device to acquire a Rhythm ID
referencetemplateisalsoavailable.
NOTE: If Rhythm ID is not enabled, a manual reference template update can
still be performed. However, the a cquired template will not be used in analysis
to determine if the patient’s rhythm is VT or SVT.
During a manual Rhythm ID reference template update, the pulse generator will
perform the following tasks:
1. Enable a controlled rate decrease to the programmed Rhythm ID Fallback
LRL. During the fallback period, the following occurs:
• The device temporarily switches to the programmed Manual Rhythm
ID Brady Mode and extends the AV delay up to 400 ms.
• Rate Smoothing, ATR, hysteresis, and dynamic programming
(excluding Dynamic VRP) are s uspended.
2. After the Fallback interval, pacing parameters are restored to normal
programmed parameters. This process will typically last one minute.
NOTE: Rhythm ID Fallback LRL settings should be selected such that normal
sinus rhythms are promoted (e.g., normal AV node conduction). Care must be
used when selecting LRL less than 50 ppm (rates that approach the patient’s
ventricular escape rates). Ventricular escape rhythms during Rhythm ID
updates may result in inappropriate therapy decisions.
- DRAFT -