BIOTRONIK Evia HF - Upper Rate and UTR Response; Lead Polarity

Chapter 5 Programmable Parameters
Evia HF / HF-T Technical Manual
PAGE 38
5.5.8 Upper Rate and UTR Response
The upper rate is programmable (up to 200 ppm) for the dual chamber sensing modes [DDD-CLS,
DDD(R), VDD(R)], and for all triggered modes (single and dual chamber). The ventricular pacing rate
will never exceed the programmed upper rate regardless of the patient’s atrial rate.
When the atrial rate surpasses the UTR, one of two different responses may occur, depending on the
programmed PVARP value and the AV Delay. Both responses — 2:1 block and Wenckebach — prevent
the device from pacing faster than the UTR.
In the Wenckebach zone, ventricular pacing is maintained at UTR as the atrial rate exceeds UTR.
Ventricular pacing continues at UTR until the atrial interval falls within PVARP+AV Delay (i.e., until a
block mode emerges) or until Mode Switching occurs.
In a 2:1 block zone, the ventricular pacing rate is half the intrinsic atrial rate. The 2:1 ratio between the
atrial and ventricular rate is maintained until the atrial rate reaches the Mode Switch Intervention Rate. At
a rate greater than this limit, ventricular pacing occurs in a non-tracking mode at the basic (sensor) rate.
WRL
1:1
2:1
60 ppm
130 ppm
150 ppm 400 ms
462 ms
1000 ms
AVD + P VAR P
Upper Tracking Rate
Basic Rate
WRL
1:1
2:1
60 ppm
130 ppm
150 ppm 400 ms
462 ms
1000 ms
AVD + P VAR P
Upper Tracking Rate
Basic Rate
Figure 22: Upper Rate Behavior Example
5.6 Lead Polarity
Chamber
Sensed
Range Default
Atrium Unipolar, Bipolar Unipolar
Right/Left
Ventricle
Unipolar, Bipolar Unipolar
Chamber
Paced
Range Default
Atrium Unipolar, Bipolar Unipolar
Right
Ventricle
Unipolar, Bipolar Unipolar
Left Ventricle
Unipolar Itip to case),
Unipolar (ring to case),
LV tip to LV ring,
LV tip to RV ring,
LV ring to LV tip,
LV ring to RV ring
Unipolar
(tip to case)