User Manual Part 2

PACING THERAPIES
RAT E ENHANCEMENTS
5-39
• Programmable Rate Smoothing values are a percentage of the RV
R–R interval (3% to 25% in 3% increments) and can be independently
programmed for:
– Increase—Rate Smoothing Up
– Decrease—Rate Smoothing Down
–Off
• The pulse generator stores the most recent R–R interval in memory.
R-waves may be either intrinsic or paced. Based on this R–R interval
and the programmed Rate Smoothing value, the device sets up two
synchronization windows for the next cycle: one for the atrium and one
for the right ventricle.
• Rate Smoothing is functional except:
– During the 8 cycles of rate Search Hysteresis
– During ATR Fallback until fallback reaches the ATR LRL, the
sensor-indicated rate, or the VRR interval
– During VRR when active
– Upon triggering PMT Termination
– Immediately following programmed LRL increases
– When above the MTR
Rate Smoothing Example Based on a Dual-Chamber Tracking Mode
Based on the most recent R–R interval stored in memory and the programmed
Rate Smoothing value, the pulse generator sets up the two synchronization
windows for the next cycle: one for the atrium and one for the ventricle. The
synchronization windows are defined below:
Ventricular synchronization window: previous R–R interval ± Rate
Smoothing value
Atrial synchronization window: (previous R–R interval ± Rate Smoothing
value) - AV Delay
- DRAFT -