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Single lead DDD pacing using electrodes with longitudinal and diagonal atrial floating dipoles
Ricardo Izquierdo1, Gonzalo Rodrigo, Juana Pelegrin
1Service of Cardiology, Zaragoza University Clinic Hospital. rizqui@wanadoo.es
Pacing and Clinical Electrophysiology : PACE
|January 11, 2003
Summary
Single lead DDD pacing with overlapping biphasic impulses (OLBI) effectively captures the atrium and reduces pacing thresholds. The diagonal atrial dipole lead showed a lower incidence of phrenic nerve stimulation during pacing.
Area of Science:
- Cardiology
- Biomedical Engineering
- Electrophysiology
Background:
- Single lead DDD pacing offers a less invasive approach to cardiac rhythm management.
- Atrial capture thresholds and phrenic nerve stimulation are critical parameters in pacing lead performance.
- Optimizing lead configurations and pacing algorithms is essential for improving patient outcomes.
Purpose of the Study:
- To evaluate the efficacy of single lead DDD pacing using longitudinal and diagonal atrial "floating" dipole leads.
- To compare atrial capture and pacing thresholds between unipolar pacing and overlapping biphasic impulses (OLBI) systems.
- To assess the incidence of phrenic nerve stimulation and other adverse effects associated with these pacing configurations.
Main Methods:
- A comparative study involving two groups of patients receiving single lead DDD pacing with different atrial dipole configurations (longitudinal vs. diagonal).
- Assessment of atrial capture using unipolar mode and OLBI system at discharge and 3 months post-implantation.
- Measurement of pacing thresholds (voltage and pulse width) and monitoring for adverse events like phrenic nerve stimulation.
Main Results:
- Atrial capture was achieved in a significant proportion of patients with both lead types using OLBI.
- The OLBI system resulted in a significant reduction in atrial pacing thresholds compared to the unipolar mode (P < 0.0001).
- The diagonal atrial dipole group exhibited a lower incidence of phrenic nerve stimulation compared to the longitudinal group, though not statistically significant.
Conclusions:
- Single lead DDD pacing with OLBI is effective for atrial capture and significantly lowers atrial thresholds.
- The diagonal atrial dipole configuration may be associated with a reduced risk of phrenic nerve stimulation.
- Further investigation into lead design and pacing strategies is warranted to optimize single lead DDD pacing efficacy and safety.