A case of repeated rate-dependent pacing threshold elevation after leadless pacemaker implantation
Tomotaka Yoshiyama1, Kenichi Nakatsuji1, Tomoya Yanagishita1
1Department of Cardiovascular Medicine, Osaka Metropolitan University Graduate School of Medicine, Osaka, Japan.
Pacing and Clinical Electrophysiology : PACE
|May 18, 2024
Summary
Leadless pacemaker thresholds can fluctuate, initially worsening then improving before stabilizing. Understanding this dynamic pacing threshold is crucial for battery longevity and avoiding unnecessary procedures.
Area of Science:
- Cardiology
- Biomedical Engineering
- Medical Devices
Background:
- Leadless pacemakers offer advantages but their pacing threshold dynamics are critical for battery life.
- Pacing threshold directly influences energy consumption and device longevity.
- Acute pacing rate-dependent threshold increases are a known phenomenon in leadless pacing.
Observation:
- A unique case of leadless pacemaker threshold fluctuation is presented.
- The pacing threshold initially increased in the acute phase, showed temporary improvement, and then worsened again.
- This paradoxical worsening occurred before eventual improvement in the chronic phase.
Findings:
- Pacing thresholds in leadless pacemakers can exhibit complex, non-linear behavior.
- Temporary worsening of thresholds, despite initial improvement, can occur.
- Complete threshold improvement is typically observed in the chronic phase.
Implications:
- Awareness of these threshold fluctuations can prevent misinterpretation of device performance.
- Avoiding unnecessary pacemaker retrieval and reimplantation reduces risks of fatal complications.
- Optimizing leadless pacemaker management requires understanding long-term threshold behavior.
