Multisensor rate adaptive pacing: Comparison of different pacing modes by monitoring respiratory parameters

E. Occhetta, G. Francalacci, A. Perucca, M. Bortnik, M. Pistono, L. Plebani, G. Trevi

Research output: Contribution to journalArticlepeer-review


Multisensor rate response was assessed in two groups of patients by monitoring heart rate (HR) and respiratory parameters. Vitatron Saphir II VDD/R dual sensor QT and Activity (ACT) pacemakers were implanted in the group 1 patients (4 men, and 1 woman aged 64 ± 12 years; ejection fraction (EF) 43 ± 6%) who had 2nd or 3rd degree AV block and normal sinus chronotropism. Vitatron Diamond II DDDR dual sensor QT and ACT pacemakers were implanted in the group 2 patients (3 men and 2 women aged 69 ± 4 years, EF 51 ± 5%) with chronotropic incompetence of the sinus node. During treadmill exercise HR (bpm), oxygen uptake (VO2, ml/kg/min), O2 pulse, carbon dioxide production, minute ventilation and respiratory exchange ratio were recorded. In group 1, the maximum HR in the VDD mode (137 ± 4 bpm) better matched ACT (134 ± 9 bpm) than QT driven (111 ± 30 bpm) or QT = ACT driven VVIR pacing (112 ± 22 bpm). VO2 at maximum exercise in the QT mode (22.4 ± 2.4 ml/kg/min) and the QT = ACT mode (25.8 ± 4.8 ml/kg/min) most closely matched with the VDD mode (24.5 ± 3.6 ml/kg/min). In group 2 both HR and VO2 were significantly higher in the DDDR mode than in the DDD mode during each phase of exercise. In conclusion a correct comparison of sensor based VVIR modes with the VDD mode should be done by analysing respiratory parameters; when comparing DDD and DDDR atrial synchronous modes, evaluation of the HR trend is sufficient.

Original languageEnglish
Pages (from-to)168-173
Number of pages6
Issue number4
Publication statusPublished - 1998


  • Cardiopulmonary exercise
  • Dual sensor
  • Rate adaptive pacing
  • Sinus chronotropic incompetence

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Cardiology and Cardiovascular Medicine


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