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The influence of sensor orientation on activity-based rate responsive pacing. Sensor Orientation Study Group
H Theres1, F Philippon, C Melzer
1Medical Clinic I. Charité Hospital, Berlin, Germany.
Pacing and Clinical Electrophysiology : PACE
|November 25, 1998
Summary
Implanting pacemakers with the piezoelectric sensor facing outward is safe and effective. This orientation requires slightly adjusted settings for optimal rate response compared to inward-facing sensors.
Area of Science:
- Cardiology
- Biomedical Engineering
- Medical Devices
Background:
- Piezoelectric activity-based pacemakers are typically implanted with sensors facing inward.
- The optimal orientation for sensor placement requires further investigation.
Purpose of the Study:
- To evaluate the safety and efficacy of activity-based rate-responsive pacemakers implanted with the sensor facing outward.
- To compare this outward-facing orientation with the conventional inward-facing placement.
Main Methods:
- Patient and pacemaker data were collected at predischarge and 2-month follow-up.
- Standardized initial rate-response settings were established using two-minute hall walks and programmer-assisted assessment.
- Sensor rate response was evaluated using a stage 3 limited CAEP protocol at the 2-month follow-up.
Main Results:
- Both inward and outward-facing sensor orientations achieved adequate sensor rate response.
- No significant differences in patient complications were observed between the two groups.
- A statistically significant difference was found in the programmed rate response curve setting and activity threshold, with the outward-facing group requiring a higher curve setting and a more sensitive activity threshold.
Conclusions:
- Activity-based rate-responsive pacemakers can be safely and effectively implanted with the sensor facing outward.
- This orientation necessitates, on average, one higher rate response curve setting and a one-value more sensitive activity threshold compared to the inward-facing orientation.