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A new pacing algorithm for overdrive suppression of atrial fibrillation. Chorus Multicentre Study Group
F D Murgatroyd1, R Nitzsché, A K Slade
1Department of Cardiological Sciences, St. George's Hospital, London, United Kingdom.
Pacing and Clinical Electrophysiology : PACE
|November 1, 1994
Summary
A new pacing algorithm safely reduces atrial premature complexes and may decrease atrial fibrillation episodes. This innovative approach is well-tolerated and adaptable, offering potential benefits for arrhythmia management.
Area of Science:
- Cardiology
- Biomedical Engineering
- Electrophysiology
Background:
- Constant rapid pacing can suppress arrhythmias but is often poorly tolerated long-term.
- Existing methods for overdrive suppression of atrial arrhythmias have limitations.
Purpose of the Study:
- To evaluate a novel pacing algorithm designed for overdrive suppression of atrial premature complexes (APCs) and atrial fibrillation (AF).
- To assess the safety, tolerability, and efficacy of the algorithm in reducing atrial arrhythmias.
Main Methods:
- A pilot, multiple crossover study involving 70 patients with dual-chamber pacemakers.
- The algorithm was tested for 24 hours, comparing arrhythmia occurrences with the algorithm active versus inactive.
- Ambulatory recordings and pacemaker statistics were used for analysis.
Main Results:
- The algorithm functioned as designed, was not consciously perceived by patients, and did not induce malignant arrhythmias.
- Significant reductions in APCs (P = 0.02) and atrial salvos (P = 0.041) were observed in a subset of patients.
- While not statistically significant overall (P = NS), fewer episodes of atrial fibrillation occurred in patients with frequent AF when the algorithm was active.
Conclusions:
- The new pacing algorithm is safe and well-tolerated for overdrive suppression of atrial arrhythmias.
- The algorithm effectively reduces atrial ectopic activity.
- It shows potential in reducing the frequency of sustained atrial fibrillation, particularly in patients with frequent episodes.