User Manual Part 2

5-32
PACING THERAPIES
AV DELAY
AV DELAY
AV Delay is the programmable time period from the occurrence of either a
paced or sensed right atrial event to a paced RV event.
AV Delay helps preserve the heart’s AV synchrony. If a sensed ventricular
event does not occur during the AV delay following an atrial event, the pulse
generator delivers a ventricular pacing pulse when AV Delay expires.
AV Delay can be programmed to the following operations:
• Paced AV Dela y
• Sensed AV D elay
This behavior occurs under the following conditions:
• Pacing state: Normal, Post-Therapy, or Temporary
• Pacing mode: DDD (R), DDI(R), or VDD(R)
Paced AV Delay
Paced AV Delay corresponds to the AV Delay following an atrial pace.
When the minimum value is less than the maximum value, then the Paced AV
Delay is scaled dynam ically according to the current pacing rate. Dynamic AV
Delay provides a more physiologic response to rate changes by automatically
shortening the Paced AV Delay or Sensed AV Delay with each interval during
an increase in atrial rate. This helps minimize the occurrence of large rate
changes at the upper rate limit and allows one-to-one tracking at higher rates.
The pulse generator automatically calculates a linear relationship based on
the interval length of the previous A–A cycle and the programmed values for
the following:
• Minimum AV De lay
• Maximum AV Delay
•LRL
•MTR
•MSR
- DRAFT -