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Preliminary experience with the pH-triggered pacemaker

L Cammilli, L Alcidi, G Papeschi

Pacing and Clinical Electrophysiology : PACE

|October 1, 1978

Summary

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This study introduces a novel pacemaker that adjusts heart rate based on blood acidosis levels, improving metabolic response. The device demonstrated sustained responsiveness in a patient one year post-implantation.

Area of Science:

Cardiovascular Medicine
Biomedical Engineering
Electrophysiology

Background:

Traditional pacemakers lack the ability to dynamically adjust stimulation rate in response to metabolic changes like acidosis.
Monitoring blood pH is crucial for understanding metabolic status, particularly during physiological stress.

Observation:

An iridium oxide electrode was used to sense blood pH in the right atrium.
Pacemaker rate increased with decreased venous pH during exercise, indicating a response to acidosis.
The pacemaker rate returned to baseline within approximately 70 minutes if acidosis persisted.

Findings:

A pH-triggered pacemaker was successfully implanted in a 72-year-old male patient.
The device demonstrated sustained responsiveness to physiological stressors, including exercise, cold pressor, ischemia, and emotional stress, one year post-implantation.

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The pacemaker effectively modulated ventricular rate in response to changes in blood pH.

Implications:

This pH-responsive pacemaker technology offers a potential advancement in cardiac pacing, allowing for personalized adjustment to a patient's metabolic demands.
Such devices could improve quality of life and therapeutic outcomes for patients with conditions requiring tailored cardiac pacing.
Further research and clinical trials are warranted to validate the long-term efficacy and safety of pH-triggered pacemakers.