BIOTRONIK Lumax DR ICD Series, Technical Manual, Page: 110 / 176

102 Lumax Technical Manual
To permit evaluation of the sensing function, the pacing rate must
be lower than the patient's intrinsic rate. In demand pacing, the
proper sensing function can be recognized if the interval between
intrinsic events and the following pacing pulse equals the basic
interval (if no Hysteresis is programmed). The following
parameters are programmable when performing the
measurements:
•
Pacing Mode
•
Pacing Rate
•
Upper Rate (Dual Chamber modes only)
•
Pulse Amplitude
•
Pulse Width
For evaluation of the sensing function, the pulse generator
features an intracardiac electrogram (IEGM) with marker signals
to indicate sensed and paced events.
2.10.2 Pacing Impedance Measurements
The Lumax ICDs/CRT-Ds have the ability to perform automatic
and manual pacing impedance measurements. The devices can
measure the pace impedance in any of the pacing configurations;
RA, RV, LV or BiV. In addition, the LV pacing polarity is also
programmable for impedance measurements (See Section 2.1).
The impedance is measured using a triggered mode with paces
of 2.4 Volts and 0.5 ms, or programmed value (whichever is
higher). During automatic measurements both atrial (only with an
atrial pacing mode) and ventricular (RV, LV or BiV) impedances
are measured
. However, they will not be measured if the normal
pacing output is programmed to a value greater than the
impedance test output (2.8 V).