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Control of pacemaker rate by impedance-based respiratory minute ventilation
Chest
|August 1, 1987
Summary
Physiologic pacemakers can be rate-controlled using respiratory minute volume, measured effectively by impedance plethysmography. This method offers precise, indirect ventilation assessment for improved exercise capacity in pacemaker patients.
Area of Science:
- Biomedical Engineering
- Cardiology
- Respiratory Physiology
Background:
- Exercise capacity in pacemaker patients can be enhanced through rate adjustment.
- Respiration is a key parameter for pacemaker rate control.
Purpose of the Study:
- To evaluate the control capability of respiratory parameters (ventilation, tidal volume, respiratory rate) on pacemaker rate.
- To assess indirect measurement of ventilation using impedance plethysmography for pacemaker rate control.
Main Methods:
- Bicycle ergometry with increasing workloads was performed on 4 volunteers and 8 pacemaker patients.
- Direct (pneumotachygraphy) and indirect (impedance plethysmography) measurements of ventilation were recorded.
- Heart rate, oxygen uptake, and ventilation were continuously monitored.
Main Results:
- A strong correlation (r = 0.8687) was observed between directly and indirectly measured ventilation.
- Respiratory minute volume demonstrated greater suitability for physiologic pacemaker rate control compared to tidal volume or respiratory rate alone.
- Impedance plethysmography proved sufficiently precise for indirect ventilation measurement.
Conclusions:
- Respiratory minute volume is a viable parameter for physiologic pacemaker rate control.
- Impedance plethysmography is a precise and suitable method for indirect ventilation measurement in this context.
- Further research is needed for optimal integration into implantable devices.