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Related Experiment Videos

Aerobic capacity in rate modulated pacing.

B Lemke1, S V Dryander, D Jäger

  • 1Department of Cardiology, University Hospital Bergmannsheil, Bochum, Germany.

Pacing and Clinical Electrophysiology : PACE
|November 1, 1992
PubMed
Summary

To improve aerobic capacity, both increased heart rate and atrioventricular (AV) synchrony are crucial. Pacing modes that combine these factors, like DDDR pacing, significantly enhance exercise performance compared to those focusing solely on heart rate.

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Area of Science:

  • Cardiology
  • Exercise Physiology
  • Biomedical Engineering

Background:

  • Chronotropic incompetence limits aerobic capacity in patients with pacemakers.
  • The relative importance of heart rate versus atrioventricular (AV) synchrony for aerobic capacity during pacing is debated.

Purpose of the Study:

  • To compare the impact of different pacemaker stimulation modes (sinus bradycardia, VVIR, DDD, DDDR) on aerobic capacity.
  • To determine whether heart rate or AV synchrony is the primary driver of improved exercise performance.

Main Methods:

  • A comparative study involving 16 patients with chronotropic incompetence and DDDR pacemakers.
  • Cardiopulmonary exercise testing was performed using DDD, VVIR, and DDDR pacing modes to assess anaerobic threshold (AT).

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Main Results:

  • DDDR pacing resulted in a 12% increase in oxygen uptake (VO2) and a 17% improvement in work capacity compared to VVIR pacing.
  • Patients with isolated sinus node disease showed more pronounced improvements with DDDR pacing.
  • No significant differences were observed between pacing modes in patients with intermittent AV block.

Conclusions:

  • The combination of increased heart rate and preserved AV synchrony is essential for significant improvements in aerobic capacity during exercise.
  • DDDR pacing, which optimizes both factors, offers superior benefits for exercise performance in eligible patients.