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Stratos LV/LV-T Technical Manual 83
CAUTION
Pulse Amplitude – Programming of pulse amplitudes, higher
than 4.8 V, in combination with long pulse widths and/or high
pacing rates can lead to premature activation of the
replacement indicator. If a pulse amplitude of 7.2 V or higher
is programmed and high pacing rates are reached, output
amplitudes may differ from programmed values.
Programming Modifications – Extreme programming
changes should only be made after careful clinical
assessment. Clinical judgment should be used when
programming permanent pacing rates below 40 ppm or above
100 ppm.
2.4.2 Sensitivity
The parameter “sensitivity” is used to set the pulse generator’s
threshold for detecting intracardiac signals. The lower the
programmed sensitivity values the higher the device’s sensitivity.
If intracardiac signals are of low amplitude, a change to a higher
sensitivity (lower value) may be indicated. Conversely, if the
sensing amplifier is responding to extraneous signals, such as
artifacts or interference, a change to a lower sensitivity (higher
value) may resolve the difficulty. In dual chamber sensing
modes, the sensitivity values for the atrial and ventricular
channels are independently programmable. With Unipolar
programming, the highest possible sensitivity setting is 1.0 mV.
2.4.3 Lead Polarity
The programmed lead polarity determines whether the CRT-P
senses or paces in a unipolar or bipolar configuration. Lead
polarity can be programmed separately for sensing and pacing
in all three chambers.
CAUTION
Atrial Sensitivity – In dual chamber systems, the atrial
sensitivity of 0.1 mV should only be programmed in
conjunction with a bipolar lead configuration.