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Related Experiment Videos

Atrial septal pacing: a method for pacing both atria simultaneously

W H Spencer1, D W Zhu, T Markowitz

  • 1Baylor College of Medicine, Houston Texas, USA.

Pacing and Clinical Electrophysiology : PACE
|December 11, 1997
PubMed
Summary

Simultaneous pacing of both atria from a single interatrial septum site enables accurate prediction and optimization of atrioventricular timing. This novel approach may also help suppress reentrant arrhythmias in patients with atrial fibrillation.

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Medical Devices

Background:

  • Paroxysmal atrial fibrillation and bradyarrhythmias often require complex pacing strategies.
  • Optimizing atrioventricular (AV) timing is crucial for effective pacing, but interatrial conduction time (IACT) can be variable.
  • Synchronous atrial depolarization may suppress reentrant arrhythmias.

Purpose of the Study:

  • To evaluate the feasibility of simultaneous atrial pacing from a single interatrial septum lead.
  • To determine if this method allows reliable prediction and optimization of left-sided AV timing.
  • To assess the impact on interatrial conduction time and potential arrhythmia suppression.

Main Methods:

  • Four male patients with paroxysmal atrial fibrillation and bradyarrhythmias were studied.

Related Experiment Videos

  • A standard active fixation lead was placed on the interatrial septum, and a ventricular lead was implanted.
  • Transesophageal echocardiography (TEE) and fluoroscopy guided lead placement.
  • Electrocardiogram (ECG) measurements compared normal sinus rhythm, atrial septal pacing, and atrial-atrial (AAT) pacing.

    • Main Results:

    • Pacing both atria simultaneously from the interatrial septum was technically feasible using standard leads and imaging guidance.
    • No significant acceleration or delay in AV conduction was observed during interatrial septum pacing compared to normal sinus rhythm.
    • Mean interatrial conduction time during AAT pacing was 97 ± 4 ms.
    • Conduction time to the high right atrium and lateral left atrium was consistently 53 ± 2 ms during atrial septal pacing.

    Conclusions:

    • Simultaneous atrial pacing from a single interatrial septum site is achievable.
    • This technique allows for accurate prediction and optimization of left-sided AV delay.
    • Potential benefits include improved pacing efficiency and possible suppression of reentrant arrhythmias.