BIOTRONIK Evia HF - Page 34

Chapter 5 Programmable Parameters
Evia HF / HF-T Technical Manual
PAGE 26
Post Paced Event Summary
Following paced events, the Detection Hold-off period is extended slightly in all chambers to prevent
oversensing of the paced complex. The step duration is twice that of sensed events to prevent T-wave
oversensing.
Atrial and ventricular post-pace sensing function the same except for the Detection Hold-off and Step
Duration. The atrial channel provides an additional step if the sensitivity is programmed to 0.2 mV as is
shown in Figure 11.
Detection
Hold-off
Step Duration Total
Minimum
Threshold
Atrium 120 ms 164 ms (2 x 82 ms) 0.2 mV
2
Right/Left Ventricle 200 ms 250 ms (2 x 125 ms) 2.0 mV
+/- Minimum
Threshold
2.0 mV
Detection Hold-off Period (DHP)
2x Step
Duration
+/- Sensitivity Threshold
from the previous event
+/- Sensitivity Threshold
of the current event
Event
Detection
Pace event
Ventricle
DHP 200 ms
Step Duration 125 ms
Post Pace Event -
Ventricle
Fixed value
Ventricle – 2.5 mV
Figure 11: Automatic Sensitivity Control for Ventricular Paced Events
+/-
Minimum
Threshold
0.2 mV
Detection Hold-off Period
(DHP)
2x Step
Duratio
n
+/- Sensitivity
Threshold
from the previous event
Event
Detection
Pace
event
Atrium
DHP 120 ms
Step Duration 82 ms
Post Pace Event – Atrium -
Bipolar
Fixed value
Atrium – 1.0
mV
Step
Duratio
n
Step
Duratio
n
½
Fixed
Value
0.5 mV
1/4
Fixed
Value
0.25 mV
Figure 12: Automatic Sensitivity Control for Atrial Bipolar Paced Events
2 If the sensing is programmed unipolar, the minimum threshold will be 0.5 mV