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Cardiac Resynchronization Therapy Response is Associated with Shorter Duration of Atrial Fibrillation
Author(s) -
LELLOUCHE NICOLAS,
DE DIEGO CARLOS,
VASEGHI MARMAR,
BUCH ERIC,
CESARIO DAVID A.,
MAHAJAN AMAN,
WIENER ISAAC,
FONAROW GREGG C,
BOYLE NOEL G.,
SHIVKUMAR KALYANAM
Publication year - 2007
Publication title -
pacing and clinical electrophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.686
H-Index - 101
eISSN - 1540-8159
pISSN - 0147-8389
DOI - 10.1111/j.1540-8159.2007.00872.x
Subject(s) - medicine , cardiac resynchronization therapy , cardiology , atrial fibrillation , heart failure , sinus rhythm , ejection fraction , incidence (geometry) , qrs complex , physics , optics
Background: Atrial fibrillation (AF) is commonly associated with heart failure. The benefit of cardiac resynchronization therapy (CRT) on atrial remodeling has been demonstrated. However, biventricular pacing did not reduce the global incidence of AF. We evaluated the relationship between CRT response and AF duration.Methods: We retrospectively analyzed data from 96 patients (59 ± 15 years; 78% male) who underwent CRT. All patients had class III–IV New York Heart Association (NYHA) symptoms despite maximal medical therapy, left ventricular ejection fraction (LVEF) ≤ 35%, QRS >130 ms, and sinus rhythm before implantation. CRT response in patients who survived at six months of follow‐up was defined as: (1) no hospitalization for heart failure and (2) improvement of one or more grades in the NYHA classification.Results: CRT responders (n = 54) and non‐responders (n = 42) had similar baseline characteristics, including the incidence of persistent AF within six months before implantation. Six months after implantation, when compared to baseline, CRT responders exhibited a significant decrease in left atrial size (47.5 ± 7.1 mm vs 44.6 ± 7.7 mm, P < 0.01) and in the incidence of persistent AF (17% vs 2%, P = 0.02). At six months, CRT responders demonstrated shorter mean AF duration (7.5 ± 43.3 hours vs 48.8 ± 129.0 hours, P = 0.03) and lower incidence of persistent AF (2% vs 19%, P = 0.004) compared to nonresponders.Conclusion: CRT response is associated with a reversal of atrial remodeling and a shorter AF duration.