Characteristics of ectopic triggers associated with paroxysmal and persistent atrial fibrillation: evidence for a changing role

Anthony Brooks, Geetanjali Rangnekar, Anand Ganesan, Ingrid Salna, Melissa Middeldorp, Pawel Kuklik, Mathias Baumert, Kurt Roberts-Thomson, Prashanthan Sanders

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    11 Citations (Scopus)

    Abstract

    Atrial premature contractions (APCs) are well described to precede the initiation of paroxysmal atrial fibrillation (pAF). However, whether APC characteristics alter with progression of the arrhythmia is unknown. To determine the APC characteristics in terms of burden and relative coupling interval with progression of the AF disease process. Fifty consecutive patients with pAF, 50 consecutive patients with persistent AF (perAF), and 25 age-matched controls underwent clinical review, transthoracic echocardiography, and ambulatory electrocardiogram monitoring. After excluding 29 patients who had AF for the entire recording (n = 24) or unreliable recordings (n = 5), we analyzed data from 49 patients with pAF, 24 patients with perAF, and 23 healthy controls. All normal morphology R-R intervals with a >25% decrease in R-R coupling compared with the previous R-R interval (coupling interval index) were deemed APCs (n = 95,873). The median APC burden was higher in patients with pAF (2 [122] APCs/h; P = .004) and perAF (3 [16] APCs/h; P = .04) than in controls (1 [01] APCs/h) but was not different (P = .66) between the AF subgroups. Patients with pAF had a distinct increase in ectopy burden after 7 PM and elevation throughout the night (P = .002) in comparison with a blunted and complementary temporal response in the perAF cohort (P = .01). Patients with pAF demonstrated a greater proportion of shortly coupled APCs (29% [1345]; P = .04) compared with persistent arrhythmia (17% [529]). "Real-life" atrial trigger statistics of APC burden, timing, and diurnal rhythms track the transition from a trigger-based, autonomically sensitive paroxysmal arrhythmia to a more substrate-based persistent disease.

    Original languageEnglish
    Pages (from-to)1367-1374
    Number of pages8
    JournalHeart Rhythm
    Volume9
    Issue number9
    DOIs
    Publication statusPublished - Sep 2012

    Keywords

    • Atrial fibrillation
    • Coupling interval
    • Ectopy
    • Trigger

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