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Related Experiment Videos

Magnet unresponsive pacemaker endless loop tachycardia.

S S Barold1, M D Falkoff, L S Ong

  • 1Department of Medicine, Genesee Hospital, Rochester, NY 14607.

American Heart Journal
|September 1, 1988
PubMed
Summary
This summary is machine-generated.

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Endless loop tachycardia (ELT) is a pacing complication. Chest wall stimulation can terminate magnet-nonresponsive ELT when DDD pacing converts to AV desynchronization.

Area of Science:

  • Cardiology
  • Biomedical Engineering
  • Electrophysiology

Background:

  • Dual-chamber (DDD) pacing can lead to endless loop tachycardia (ELT), a common complication.
  • Magnet application typically terminates ELT by converting pacing to asynchronous mode (DOO).

Observation:

  • Magnet application may fail to terminate ELT if ventriculoatrial (VA) synchrony converts to atrioventricular (AV) desynchronization.
  • This desynchronization occurs when paced ventricular beats trigger unsensed retrograde P waves, leading to ineffective atrial stimuli during the refractory period.

Findings:

  • Magnet-unresponsive ELT involves a self-perpetuating VA synchrony due to AV desynchronization.
  • Upon magnet removal, the AV desynchronization reverts to ELT.

Related Experiment Videos

Implications:

  • Chest wall stimulation offers a practical, non-invasive method to terminate magnet-unresponsive ELT in the absence of programmers.
  • This technique provides a crucial alternative for managing refractory pacing-induced arrhythmias.