Chapter 6 Statistics
Evia HF / HF-T Technical Manual
PAGE 67
Figure 35: Event Counters in the Timing Bradycardia Statistics
Key Points:
LVs is only enabled when the feature LV T-wave protection is turned ON. If this feature is not enabled,
the LV pace will show 100% since the device will not have the ability to sense intrinsic LV events.
RVrs events are those RV events within 200 ms of the preceding RV sensed event. The 200 ms
sensed refractory period is non-programmable.
RVES = Right ventricular extra systole (PVC), dened by the device when the following criteria are met:
• Two ventricular events with no Ap or As in between
• An Ars did not occur within 350 ms of the subsequent Vs event
Ars (PVARP) are those events falling into the PVARP timer and outside the Discrimination after As
window. Likely examples of these types of events include non-conducted PAC events or events
occurring during Mode Switch.
Ars events are those events occurring during an AV Delay window.
NOTE:
All event counter data are transmitted to the programmer and evaluated there, but not all events are
displayed in detail on the programmer.
6.2.2 Event Sequences
Event sequences, shown in Figure 36, provide the percentage of each state of pacing in the
Evia CRT-P.
This statistic provides information related to sinus and AV node function. A high percentage of Ap - Vx
events may suggest problems with the sinus node. A high percentage of Ax - Vp events may suggest
problems with the AV node conduction. Vx - Vx events may suggest one of the following: PVCs, atrial
undersensing, run(s) of VT or a sinus tachycardia in which atrial events fall in the FFP window.
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