However, the detection response time may sometimes result in temporary high ventricular rates. A physiological band is defined based upon the amount of activity indicated by the accelerometer.
Tracking occurs as long as the sinus rate falls within the band.
The algorithm was evaluated in 6 patients implanted With a DDDR pacemaker. The patients had developed paroxysmal atrial fibrillation. The minimum and maximum VPR was reported every 10 sec. The average standard deviation for the 6 patients was 11.7 ppm. The initial band width was defined by the STL at rest.