User Manual Part 1

TACHYARRHYTHMIA DETECTION
VENTRICULAR DETECTION
3-9
If the passive method is enabled, the pulse generator will attempt to collect the
Rhythm ID reference template every two hours using the programmed brady
settings .
Iftheactivemethodisenabledandsevendayshavepassedsincethelast
successful collection of a reference template, then every 28 hours the device
automatically analyzes the patient’s intrinsic rhythm by adjusting the brady
parameters. During a Rhythm ID active reference template update, the
following will occur:
1. The device verifies that the patient is at rest (as measured by the
accelerometer input).
2. The device enables a controlled pacing rate decrease to the programmed
Rhythm ID Fallback LRL. Du r ing this f allb ack period, the follo win g occurs:
• The device temporarily switches the pacing m ode to DDI, VDI, VVI,
AAI, or Off (according to the programmed brady mode) and extends
the AV delay up to 400 ms.
• Biventric ular Trigger, Rate Smoothing, ATR, hysteresis, and dynamic
programming (excluding Dynamic VRP) are suspended. The pacing
chamber is set to Biventricular; LV Offset is set to 0.
3. After the Fallback period, pacing parameters are restored to normal
programmed parameters. Fallback periods occur no m ore 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 acquired 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 t he 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.
- DRAFT -