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[Arrhythmia induction during atrial pacing with atrial floating electrodes]
Ricardo Izquierdo1, Juana Pelegrín, Antonio Sánchez
1Servicio de Cardiología, Hospital Xeral-Calde, Lugo, España.
Revista Espanola De Cardiologia
|May 21, 2004
Summary
Floating atrial electrodes in VDD pacing systems can move, causing pacing failures. This can lead to dangerous heart rhythms like intranodal tachycardia due to intermittent atrial capture failure.
Area of Science:
- Cardiology
- Biomedical Engineering
- Electrophysiology
Background:
- Single lead VDD pacing systems utilize floating atrial electrodes.
- The design aims for simplicity but presents challenges with electrode stability.
Observation:
- Body and respiratory movements can displace atrial electrodes.
- This displacement alters the atrial dipole position, impacting pacing efficacy.
Findings:
- Intermittent atrial capture failure was observed.
- This led to episodes of intranodal tachycardia in a patient with a DDD pacing system.
- Asynchronous pacing poses a risk for potentially arrhythmogenic events.
Implications:
- Floating electrodes in VDD and DDD systems carry risks of lead dislodgement.
- Potential for lead migration necessitates careful patient monitoring.
- Alternative lead designs or fixation methods may be required for improved stability and safety.