Rate-responsive pacing based on the atrio-ventricular conduction time: comparison of different algorithms

Area of Science:

• Biomedical Engineering
• Cardiovascular Physiology
• Control Systems

Background:

• Chronotropic incompetence (CI) impairs physiological heart rate control during exercise.
• Rate-responsive pacing offers a potential solution for CI patients.
• Existing patented algorithms lack reported validation and real-world application.

Purpose of the Study:

• To compare the performance of three patented rate-responsive pacing algorithms against a newly developed one.
• To evaluate algorithm stability, disturbance attenuation, and response time using a cardiac system simulation model.

Main Methods:

• Development of a cardiac system simulation model using patient data.
• System identification (stationary and dynamic) and control system design.
• Testing of four rate-responsive pacing algorithms (three patented, one new) against defined criteria.

Main Results:

• Strict implementation of the three patented algorithms resulted in instability and unusable parameterizations.
• Redesign attempts improved one patent, but two others exhibited intolerably high pacing frequency variability.
• The newly developed algorithm demonstrated superior performance in simulation tests.

Conclusions:

• Patented rate-responsive pacing algorithms require significant redesign for clinical viability.
• The authors' novel algorithm shows potential for improving heart rate control in CI patients.
• Further research is needed to optimize pacing frequency variability in rate-responsive systems.