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Optimization of Transesophageal Atrial Pacing to Assess Atrial Fibrillation Susceptibility in Mice

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Summary

An 80-year-old woman with a VDD-pacemaker experienced low atrial sensing due to lead displacement. This case highlights potential left atrial sensing from the right ventricular outflow tract, maintaining AV-synchrony.

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Area of Science:

Cardiology
Electrophysiology
Medical Device Technology

Background:

A permanent VDD-pacemaker was implanted in an 80-year-old woman to manage recurrent syncope caused by second-degree type 2 atrioventricular (AV) block.
During follow-up, suboptimal atrial sensing was observed, resulting in an AV-synchrony of only 58-73%.

Observation:

Four years post-implantation, a chest radiograph revealed significant displacement of the atrial dipole into the right ventricular outflow tract (RVOT).
This displacement occurred during a hospitalization for non-cardiac reasons.

Findings:

The displaced atrial dipole in the RVOT was hypothesized to be sensing the left atrium.
This left atrial sensing, despite lead malposition, was proposed as the mechanism maintaining adequate AV-synchrony.

Implications:

This case suggests that pacemaker lead displacement into the RVOT can lead to unexpected atrial sensing from adjacent cardiac structures.
Understanding the anatomical proximity between the RVOT and the left atrial appendage is crucial for interpreting pacemaker function and troubleshooting sensing issues.
Further investigation into lead behavior and anatomical relationships may improve pacemaker programming and patient management in similar scenarios.