BIOTRONIK Evia HF - Pacing Amplitude Histogram; Pacing Threshold Trend

Chapter 6 Statistics
Evia HF / HF-T Technical Manual
PAGE 78
The lead impedance trend, shown in Figure 46, displays the impedance data collected since the last
time the statistics were restarted. Impedance data is collected throughout the day, and the average
value is displayed for the 24-hour period.
The device measures both unipolar and bipolar impedances. If the device is programmed bipolar,
the bipolar values will be displayed. If the device is programmed unipolar, the unipolar values will be
displayed.
The data trend duration is 240 days. After 240 days, the device will overwrite the oldest data.
6.5.2 Pacing Amplitude Histogram
This function records how often the atrial and right/left ventricular pulse amplitudes are within specic
ranges. The rate range is subdivided into categories ranging from 0.1 V to > 6.0 V. The ventricular
pacing amplitude is sampled at 2 second intervals and entered in the histogram. The percentage and
total number of 2 second intervals occurring within an amplitude class is displayed.
Recording stops when ACC or RVCC/LVCC are disabled between follow-ups or if the memory available
for recording the ventricular amplitude is full. Data may be recorded for several years. The frequency
distribution of the sensor rates can also be displayed as a diagram during follow-up examinations.
Figure 47: Pulse Amplitude/Threshold Trend
The Pulse amplitude/Threshold trend in Figure 47 shows the thresholds determined from the capture
control testing. The last threshold test done each day will be displayed on the graph.
6.5.3 Pacing Threshold Trend
This trend records the atrial and right/left ventricular pacing thresholds measured during SA/
CV sequences. A threshold sample is measured every 24 hours. The maximum trend duration is
approximately 240 days with a sampling interval of approximately 24 hours.
The pacing threshold sampled is always the most recent measured threshold. In other words, the
logged pacing threshold is unaffected by ACC or RVCC/LVCC algorithm failures or aborts.