Device eccentricity: Postmagnet behavior of DDDR pacemakers with automaticthreshold tracking

The normal pacing system function associated with the AutoCapture Pacing Sy stem algorithm triggered concern on the part of the clinical staff caring f or the patient when the initiation of a threshold search sequence was detec ted during a transtelephonic follow-up evaluation. The analysis of the rhyt hm demonstrates that the behavior of the system is nor mal and consistent w ith the design of the AutoCapture algorithm. As a variety of new algorithms are introduced, similar unexpected but normal behaviors can be anticipated .