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Physical movement sensitive pacing: comparison of two "activity"-triggered pacing systems
K Stangl1, A Wirtzfeld, O Lochschmidt
1I. Medical Clinic, Technical University Munich, Germany.
Pacing and Clinical Electrophysiology : PACE
|January 1, 1989
Summary
The Sensolog (S) pacemaker demonstrated superior workload discrimination compared to the Activitrax (A) pacemaker during exercise. Both pacemakers showed similar susceptibility to external noise during daily activities and vibration tests.
Area of Science:
- Biomedical Engineering
- Cardiology
- Medical Device Technology
Background:
- Pacemakers are crucial for regulating heart rhythm.
- Understanding pacemaker response to external stimuli is vital for patient safety and device efficacy.
- External noise and physical activity can potentially affect pacemaker performance.
Purpose of the Study:
- To compare the susceptibility of Activitrax (A) and Sensolog (S) pulse generator units to external noise.
- To evaluate the performance of both pacemaker systems under ergometric conditions and during daily activities.
Main Methods:
- Bench tests involving controlled vibration on a swingboard.
- Treadmill exercise tests in patients to assess workload discrimination.
- Holter monitoring to record pacemaker rate behavior during daily activities.
Main Results:
- Both pacemakers exhibited frequency-selective operation (2-70 Hz), with peak sensitivity between 10-50 Hz.
- Sensolog (S) showed significantly better discrimination of workload changes during treadmill exercise compared to Activitrax (A).
- Sensolog (S) displayed a linear relationship between pacing rate and power (r=0.92), while Activitrax (A) showed minimal dependence (r=0.2).
Conclusions:
- Sensolog (S) offers superior workload discrimination in pacemaker patients.
- Both systems demonstrated comparable susceptibility to external noise during transportation and vibration.
- Lying prone caused transient rate increases in both pacemakers, more pronounced in Sensolog (S).