BIOTRONIK Evia HF - General Statistical Information; Timing Statistics; Event Counter

Chapter 6 Statistics
Evia HF / HF-T Technical Manual
PAGE 66
6.1.1 General Statistical Information
The Evia CRT-P statistics modes are always in operation and cannot be selected OFF.
The counters within the statistic features do not operate when a magnet is applied to the pulse
generator.
The counters within the statistic features are reset each time the pulse generator is permanently
programmed.
The histogram bars are standardized to a rate class width of 10 ppm to avoid distortion of the rate
distribution that would be caused by varying rate class widths. The formula is:
Bar Length =
percentage of total events occurring represented by
the events counted in this class x 10
rate width of this class
6.2 Timing Statistics
6.2.1 Event Counter
The event counter totals all of the sensed and paced events. With the event counter, the following
events and event sequences can be registered over several years:
Listed is a summary of what each event means:
Event Counters
In the Event counters, shown in Figure 35, the legend is as follows:
As - refers to atrial sensed events.
As (PVARP) - refers to atrial events occurring during the PVARP period, but outside the FFP
period.
Ars - atrial events occurring during the atrial refractory period or during Mode Switching in which
the A-A period is less than the programmed atrial refractory period.
Ars (FFP) - events occurring on the atrial channel within the programmed far-eld protection
period of either ventricular paced or sensed events. Events in this window are not used towards
Mode Switching.
Ap - atrial paced events.
RVs - RV sensed events.
RVES - RV extrasystoles (PVCs).
Evia CRT-P denes a PVC as two ventricular events without an atrial event in between. A VT
with a slower atrial rhythm will have those events following the atrial events classied as Vs
events
RVrs - RV refractory sensed events occurring within the programmed ventricular refractory
period of the device.
RVp - RV paced events.
LVs - LV sensed events.
LVrs - LV refractory sensed events occurring within 200 ms of the previous LV event.
LVp - LV paced events.