User Manual

76 Lumax Technical Manual
Prior to the V-V delay optimization procedure, each patient
underwent an optimization of AV timing. Following the AV timing
adjustment, this standardized procedure was followed for the
optimization of V-V delay:
1. Program the Lumax HF-T “Initially Paced Chamber”
parameter to either RV or LV based on preference
2. Assess the VTI measurement at the following V-V delays
(additional V-V settings may be utilized at the physician’s
discretion):
 •100 ms
 • 80 ms
 • 60 ms
 • 40 ms
 • 20 ms
 • 0 ms
Note: Use the average VTI parameter over a 3 beat cycle and
wait 10 to 15 seconds between changing V-V delay settings.
Also, attempt to measure the VTI parameter within the same
patient respiratory cycle.
3. Record the VTI measurement associated with each V-V
delay setting
Repeat steps 1-3 for the remaining “Initially Paced Chamber”
parameters
Select permanent “Initially Paced Chamber” and “V-V delay after
Vp” to reflect the maximum VTI measurement for final
programming.
2.3 Sensing (Automatic Sensitivity Control)
The Lumax ICDs/CRT-Ds use Automatic Sensitivity Control
(ASC) to adjust the input stage sensitivity threshold for each
channel to appropriately detect the various cardiac signals. The
characteristics of the sensing circuitry have been optimized to
ensure appropriate sensing during all potential cardiac rhythms.