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Identification of "substrate fibrillators" and "trigger fibrillators" by pacemaker diagnostics.

Abstract：

BACKGROUND:The population of patients likely to respond to selected pacing algorithms for maintenance of sinus rhythm is unknown. OBJECTIVES:The purpose of this study was to identify patients with specific onset patterns of paroxysmal atrial fibrillation (AF). METHODS:Dual-chamber pacemakers with advanced diagnostic functions were implanted in 112 patients with conventional indications for antibradycardia pacing and a history of paroxysmal AF. Pacemaker diagnostic data were analyzed after 97.5 +/- 40.9 days. According to the frequency of premature atrial contractions (PACs) during the 5 minutes before AF onset, patients were assigned to one of three groups: group A (high PAC activity), group B (moderate PAC activity), or group C (low PAC activity). RESULTS:AF burden was lower in group A (4.6% +/- 2.4%) than group B (15.8% +/- 3.0%, P = .003) and group C (15.5% +/- 3.1%, P = .003). Fewer AF episodes occurred in group A (2.1 +/- 1.3 per day) than group B (3.8 +/- 1.2 per day, P = .006). Mean AF episode duration was shorter in group A (11.4 +/- 10.2 hours) than group C (41.4 +/- 27.5 hours, P = .03). CONCLUSION:The coincidence of low PAC activity before AF onset, high AF burden, and extended arrhythmia episode duration appears to be the consequence of a high atrial substrate factor. In these "substrate fibrillators," the efficacy of pacing algorithms for maintenance of sinus rhythm may be limited. In contrast, "trigger fibrillators" exhibiting low AF burden despite high PAC incidence may represent the target population for specific PAC-suppressing pacing algorithms.

journal_name

Heart Rhythm

journal_title

Heart rhythm

authors

Yang A,Ruiter J,Pfeiffer D,Esmailzadeh B,Welz A,Hochhäusler M,Nickenig G,Lüderitz B,Lewalter T

doi

10.1016/j.hrthm.2006.01.030

subject

Has Abstract

pub_date

2006-06-01 00:00:00

pages

682-8

issue

6

eissn

1547-5271

issn

1556-3871

pii

S1547-5271(06)00127-5

journal_volume

3

pub_type

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