(Circulation. 1997;96:2992-2996.)
© 1997 American Heart Association, Inc.
Articles |
Effects of Different Atrial Pacing Modes on Atrial Electrophysiology
Implicating the Mechanism of Biatrial Pacing in Prevention of Atrial Fibrillation
From the Division of Cardiology, Department of Medicine, National Yang-Ming University, School of Medicine, and Veterans General Hospital, Taipei, Taiwan.
Correspondence to Shih-Ann Chen, MD, Division of Cardiology, Veterans General Hospital-Taipei, 201 Sec 2, Shih-Pai Road, Taipei, Taiwan. E-mail sachen{at}vghtpe.gov.tw
Background Multiple-site atrial pacing has been shown to prevent recurrence of atrial fibrillation. However, information about the mechanisms of different atrial pacing modes in prevention of atrial fibrillation was not clear.
Methods and Results Forty-two patients without structural heart disease were classified into group 1 and group 2 according to absence or presence of clinical atrial fibrillation, respectively. Atrial conduction time and electrogram width of the right posterior interatrial septum (RPS) were measured during drive-train stimulation (S1) and early extrastimulation (S2). The locations of S1 were the high right atrium (HRA), distal coronary sinus (DCS), or both sites simultaneously. Effective refractory periods (ERPs) of the HRA and DCS were also determined during S1 stimulation at each site and during biatrial pacing. The ERPs were not different between single-site atrial pacing and biatrial pacing. In contrast, early S2 stimulation at the HRA caused greater atrial conduction delay and greater increment of electrogram width of the RPS in patients with a history of atrial fibrillation. Biatrial pacing significantly reduced the conduction delay and electrogram width of the RPS caused by HRA extrastimulation. In addition, in 17 group 2 patients, atrial fibrillation was induced by an early HRA S2 coupled to HRA pacing. However, with the same coupling interval of S2 at HRA, only 6 of them had the arrhythmia induced during biatrial pacing. Furthermore, conduction delay and increase of electrogram width caused by early S2 at the HRA were reduced by biatrial pacing only in patients whose arrhythmia induction was successfully prevented by biatrial pacing.
Conclusions Biatrial pacing reduced both the atrial conduction delay and increase of electrogram width at the RPS caused by early S2 at HRA, and these effects could prevent induction of atrial fibrillation.
Key Words: fibrillation • electrophysiology • pacing
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