BIOTRONIK Evia HF, Technical Manual, Page: 79 / 138

Chapter 6 Statistics
Evia HF / HF-T Technical Manual
PAGE 71
6.2.5 Atrial and Ventricular Rate Histogram
Figure 39: Rate Histogram
In the Heart Rate Histogram shown in Figure 39 , the heart rate range is divided into 36 segments of 10
bpm bins ranging from less than 40 bpm to greater than 380 bpm.
Touching the screen or using the arrows on the left side of the screen or inside the graph moves the
cursor to different heart-rate bins and shows the amount of pacing or sensing in each rate bin, as well
as the event count in each rate bin.
The gray portion of the chart represents the heart rate range up to the Max activity rate.
The Max activity rate represents the programmed maximum sensor rate value, regardless of whether
the sensor is active.
Key Points:
The Rate Histogram displays the percentage of paced and sensed events in each rate bin listed along
the horizontal axis.
The Rate Histogram is based on Ap, As, Ars, As(PVARP), Vp, Vs, PVC, and Vrs.
Atrial and ventricular rates are plotted on two separate graphs: atrium on the top and ventricle on bottom.
Paced events are lighter in color and sensed events are darker.
A high percentage of atrial events in the upper rate bins may indicate atrial arrhythmias, but could also
be due to far-field oversensing.
Atrial or ventricular events below the basic rate may be due to PVCs resetting the basic rate interval or
atrial undersensing.
NOTE:
The bars of the histogram are standardized to a rate class width of 10 ppm to avoid distortion of the
rate distribution.