Specifications

VVIR Mode Operation
The VVIR mode provides ventricular rate responsive pacing in patients for
whom atrial-based pacing is deemed unnecessary or inappropriate. In the
absence of sensed events, the ventricle is paced at the sensor-indicated rate.
NOTE: In the VVIR mode, ventricular refractory sensed events restart the
programmed Upper Activity Rate interval.
Example of VVIR Mode Operation
Pacing Modes 10-27
Parameters:
Lower Rate = 60 ppm (1000 ms)
Sensor-indicated Rate = 90 ppm (667 ms)
Upper Activity Rate = 120 ppm (500 ms)
Ventricular Refractory Period = 300 ms
V
P
Sensor-indicated
Interval
200 ms
V
P
V
P
V
R
Upper Activity
Rate Interval
Sensor-indicated
Interval
Sensor-indicated
Interval
V
P
9879EN-10_9501042_CTC.qxd 12/14/01 3:36 PM Page 10-27