PMID: 8945027Nov 1, 1996Paper

Evaluation of a new sensor-based algorithm to protect against atrial arrhythmias

Pacing and Clinical Electrophysiology : PACE
M DelayJ Puel

Abstract

The SmarTracking (ST) algorithm (Marathon 294-09, Intermedics Inc.) uses the sensor-calculated rate (SCR) to define a "variation band" for the intrinsic sinus rate. If the sinus rate exceeds the upper limit of the band, the ventricular pacing rate is limited by the ST rate (STR) and Wenckebach behavior is observed. The present study was aimed at evaluating the behavior of the ST mechanism in patients with healthy sinus node, during exercise and at rest. Twenty-one patients (15 men; mean age 67.8 +/- 9.7 years) with normal sinus function were studied. Heart rate was recorded via the rate profile of the implanted pacemaker (Relay 294-03, Intermedics Inc.), and STR and SCR were obtained via a previously calibrated strap-on pacemaker. A 15-minute protocol was used during which subjects alternated periods of walking with periods of rest. The relative difference between the average STR and the average sinus rate (DST) was calculated for each phase of the protocol as well as the maximum number of patients showing inappropriate Wenckebach behavior (#W). At nominal settings, DST was always positive and did not fall below 20%. #W was maximum at rest (5) and during heavy exercise (3). By increasing the STR at rest to 95 ppm and the maximu...Continue Reading

References

Dec 1, 1990·Pacing and Clinical Electrophysiology : PACE·M T LeeJ Vandegriff
Apr 1, 1991·Clinical Cardiology·H Schüller, J Brandt
Feb 1, 1988·The American Journal of Cardiology·D E RedikerJ W Harthorne
May 1, 1983·Pacing and Clinical Electrophysiology : PACE·L FananapazirP Monks
Nov 1, 1994·Pacing and Clinical Electrophysiology : PACE·P A LevineB Mann
Nov 1, 1994·Pacing and Clinical Electrophysiology : PACE·I E OvsyshcherC Bondy

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