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Chapter 5 Programmable Parameters
Evia HF / HF-T Technical Manual
PAGE 23
Pacing outputs can be programmed in each chamber from 0.2 V to 7.5 V if Capture Control is inactive.
Caution should be used when programming high outputs for an extended period of time, as this can
result in reduced longevity.
Programming the pacing output in the atrial or ventricular channel is not possible when Atrial and
Ventricular Capture Control is ON as the programmed output is determined by the device.
NOTE:
When VCC is programmed to 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 0.7 V.)
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 7.0 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.
5.3.2 Pulse Width
The pulse width can be programmed as shown in Table 4 .
Chamber Range Default
Atrium
0.1, 0.2, 0.3, 0.4, 0.5,
0.75, 1.0, 1.25, 1.5 ms
0.4 ms
Right/Left
Ventricle
0.1, 0.2, 0.3, 0.4, 0.5,
0.75, 1.0, 1.25, 1.5 ms
0.4 ms
Table 4: Pulse Width Parameters
The selected pulse width determines the duration for which the programmed pulse amplitude will be
applied to the heart. The pulse width is independently programmable (0.1 to 1.5 ms) for the atrial and
ventricular channels. Pulse width remains constant throughout the service life of the pulse generator.
Evia HF / HF-T comes with nine available Pulse Width choices in each chamber, providing a wide
variety of choices for pacing management. The Pulse width options are shown in Figure 8 . Pulse
widths may be extended, allowing reduction of Pulse amplitude to prevent diaphragmatic stimulation in
patients. When capture control is programmed ON, pulse width programming cannot exceed 0.4 ms,
as shown by the conflicts in Figure 8 .
If a threshold test was performed, the capture threshold value obtained is displayed at the bottom of the
Pulse width screen to help guide output programming.