BIOTRONIK Evia DR, Technical Manual

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Evia Technical Manual 63
7.3 Pulse Specific Features
Features related to the pacing pulse.
7.3.1 Pulse Amplitude
The programmed pulse amplitude determines the voltage
applied to the heart during each pacing pulse. The pulse
amplitude is independently programmable for the atrial and
ventricular channels up to 7.5 volts. The pulse amplitude
remains consistent throughout the service life of the pulse
generator. The pacing safety margin is therefore not reduced by
a decrease in the pulse generator's battery voltage.
N
OTE
:
When VCC is programmed to ON or ATM, the pulse
amplitude cannot be programmed by the user to a value
higher than the programmed Maximum VCC Amplitude
(Max. Ampl.). When VCC is programmed to ON, the pulse
amplitude will be set by the device to the threshold plus the
programmed Safety Margin, but never lower than the
Minimum VCC Amplitude (fixed at 0.7V.)
C
AUT IO N
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 7.0 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.