PMID: 2451223Feb 1, 1988Paper

Limitations of rate response of an activity-sensing rate-responsive pacemaker to different forms of activity

Pacing and Clinical Electrophysiology : PACE
C P LauA J Camm

Abstract

The responses of an activity-sensing rate-responsive system (Activitrax) to various forms of physiological activity were assessed in 15 individuals who had this pacemaker. Nine were patients with complete heart block and atrial arrhythmias; their mean age was 60 years (range, 41-85 years). Six were age-matched healthy volunteers who were exercised with an external Activitrax system attached firmly to the chest wall. The pacemaker was programmed to achieve a pacing rate of about 100 bpm at the end of the first stage of the Bruce protocol (pacemaker settings: rate = 70-150 bpm; threshold = low to medium; response = 6-9). In the activity-sensing ventricular pacing mode, all patients achieved a significant increase in treadmill time compared to constant-rate ventricular pacing (mean +/- SD, 8.0 +/- 3.3 vs 5.4 +/- 2.3 minutes; p less than 0.01), with a mean maximum pacing rate of 123 +/- 18 bpm. Jogging in place produced a prompt increase in pacing rate, with the maximum achieved at the end of the exercise. However, physiological activities such as hand-grip, the Valsalva maneuver and standing resulted in only minimal rate response. Pacing rate after ascending 4 flights of stairs was the same as that achieved after descending the sa...Continue Reading

References

Mar 24, 1977·The New England Journal of Medicine·R A Bruce
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Citations

Mar 1, 1991·Clinical Cardiology·J C Griffin
Mar 1, 1993·Clinical Cardiology·D KatritsisA J Camm
Feb 1, 1990·Journal of the American College of Cardiology·G F Tyers
Mar 1, 1991·Journal of the American College of Cardiology·N SulkeE Sowton
Jan 11, 1996·The New England Journal of Medicine·F M Kusumoto, N Goldschlager
Jan 6, 2001·Journal of Cardiopulmonary Rehabilitation·R W BraithJ A Hill
Apr 1, 1992·British Heart Journal·A W Nathan, D W Davies
Nov 1, 1994·British Heart Journal·M Griffith
Jul 1, 1989·Clinical Cardiology·V PaulA J Camm
Mar 10, 2000·Cardiology Clinics·S K Leung, C P Lau
Nov 23, 2016·Heart Rhythm : the Official Journal of the Heart Rhythm Society·Michael LloydGabor Z Duray
Oct 1, 1991·Pacing and Clinical Electrophysiology : PACE·A SchuchertW Bleifeld
Dec 19, 1998·Journal of Cardiopulmonary Rehabilitation·C T SharpR G Haennel
Oct 1, 1990·Circulation·S Furman
Sep 23, 1998·Pacing and Clinical Electrophysiology : PACE·R G HaennelE Busse
Apr 29, 1998·Pacing and Clinical Electrophysiology : PACE·S GarrigueJ Clémenty
Nov 25, 1998·Pacing and Clinical Electrophysiology : PACE·H TheresK Prest-Berg
Nov 1, 1988·Pacing and Clinical Electrophysiology : PACE·H MondG Baker
Mar 1, 1989·Pacing and Clinical Electrophysiology : PACE·H F McAlisterS Furman
Aug 1, 1989·Pacing and Clinical Electrophysiology : PACE·V MahauxH E Kulbertus
Sep 1, 1993·Pacing and Clinical Electrophysiology : PACE·D T Connelly
Jul 1, 1993·Pacing and Clinical Electrophysiology : PACE·M E CabreraJ Liebman
Oct 1, 1990·Pacing and Clinical Electrophysiology : PACE·C P LauW H Leung
Oct 1, 1988·Pacing and Clinical Electrophysiology : PACE·C P LauA J Camm
Oct 1, 1988·Pacing and Clinical Electrophysiology : PACE·D MehtaA J Camm
Jun 1, 1988·Pacing and Clinical Electrophysiology : PACE·C P LauA J Camm
Dec 1, 1992·Pacing and Clinical Electrophysiology : PACE·E Erdelitsch-ReiserK Kochsiek
Aug 1, 1992·Pacing and Clinical Electrophysiology : PACE·H Mond, N Strathmore
Mar 1, 1992·Pacing and Clinical Electrophysiology : PACE·J W LeitchK Riff
Mar 1, 1992·Pacing and Clinical Electrophysiology : PACE·C P LauS Song
Jul 1, 1992·Pacing and Clinical Electrophysiology : PACE·C M BellamyR G Charles
Aug 1, 1992·Pacing and Clinical Electrophysiology : PACE·C P Lau
Aug 1, 1996·Pacing and Clinical Electrophysiology : PACE·S E GreenhutC P Lau
Nov 1, 1994·Pacing and Clinical Electrophysiology : PACE·V A MahauxH Kulbertus

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