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Related Experiment Videos

P wave tracking above the maximum tracking rate in a DDDR pacemaker.

S T Higano1, D L Hayes

  • 1Division of Cardiovascular Diseases and Internal Medicine, Mayo Clinic, Rochester, Minnesota 55905.

Pacing and Clinical Electrophysiology : PACE
|July 1, 1989
PubMed
Summary

Dual-chamber, rate-modulated pacemakers (DDDR) can exhibit unexpected upper rate behavior. P wave inhibition of sensor output can cause variable tracking rates, which is a normal function, not a malfunction.

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Area of Science:

  • Cardiology
  • Biomedical Engineering
  • Medical Devices

Background:

  • Recent advancements in dual-chamber, rate-modulated pacemakers (DDDR) integrate atrial activity and sensor data for rate response.
  • These sophisticated devices aim to optimize cardiac output by dynamically adjusting pacing rates.

Observation:

  • Unexpected upper rate behavior was observed in DDDR pacemakers during clinical use.
  • Episodes of apparent P wave tracking above the programmed maximum tracking rate (100 ppm) were noted, even with a maximum sensor pacing rate of 150 ppm.

Findings:

  • The observed phenomenon is attributed to P waves inhibiting the sensor-driven atrial pacing output.
  • This inhibition leads to variable maximum tracking rates, temporarily equaling the current sensor-driven rate.
  • This behavior, while unexpected, represents a normal function of DDDR pacemakers.

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Implications:

  • Recognition of this normal DDDR function is crucial to prevent unnecessary investigations for pacemaker malfunction.
  • Understanding this interaction ensures accurate interpretation of pacemaker behavior and appropriate patient management.
  • This finding contributes to the safe and effective use of advanced cardiac pacing technologies.