Related Experiment Videos
Decrease in the spatial dispersion at the termination of atrial fibrillation by intravenous cibenzoline.
Hiroyuki Kakugawa1, Akihiko Shimizu, Toshihiko Yamagata
1Division of Cardiovascular Medicine, Yamaguchi University School of Medicine, Ube, Japan.
Summary
Intravenous cibenzoline increased atrial cycle length and reduced spatial dispersion in patients with atrial fibrillation (AF). This reduction in spatial dispersion, not cycle length, appears key to terminating AF.
Area of Science:
- Cardiology
- Electrophysiology
- Pharmacology
Background:
- Atrial fibrillation (AF) is a common arrhythmia.
- Understanding the mechanisms of AF termination is crucial for effective treatment.
Purpose of the Study:
- To investigate the electrophysiological effects of intravenous cibenzoline in patients with induced AF.
- To determine the mechanisms by which cibenzoline terminates AF.
Main Methods:
- Recorded atrial electrograms from multiple sites in 15 patients with induced AF.
- Measured atrial cycle length (AFCL), spatial, and temporal dispersion before and after cibenzoline administration.
- Compared these parameters between patients who terminated AF (T group) and those who did not (non-T group).
Main Results:
- Cibenzoline increased mean AFCL and decreased spatial dispersion in both groups.
- The decrease in spatial dispersion was significantly greater in the T group compared to the non-T group post-treatment.
- Neither mean AFCL nor temporal dispersion changes predicted AF termination.
Conclusions:
- Intravenous cibenzoline effectively terminates AF in a subset of patients.
- The primary mechanism for AF termination by cibenzoline appears to be a reduction in spatial dispersion of AFCL.
- Changes in mean AFCL or temporal dispersion do not predict treatment response.