LA diameter more than 40 mm predicts recurrence of atrial fibrillation after trans-catheter ablation : a systematic review and meta-analysis

• Background and Aim: Left atrial (LA) enlargement is associated with atrial fibrillation (AF) incidence and outcome. Trans-catheter ablation of AF has now become a conventional treatment of AF but its recurrence remains of clinical significance. The predictive role of the LA size in AF treatment is still controversial, hence the aim of this meta-analysis was to analyze the potential association between LA diameter and AF recurrence after ablation.Methods: We systematically searched PubMed-Medline, EMBASE, Scopus, Google Scholar and the Cochrane Central Registry, up to December 2016 in order to select clinical trial and observational studies, which assessed the predictive role of LA diameter in AF recurrence after catheter-ablation. 13.573 patients from 61 studies with paroxysmal AF (PAF), persistent (PeAF) or longstanding persistent AF (L-PeAF) were included.Results: The pooled analysis showed that after a follow-up period of 19± 7.74 months, patients with AF recurrence had larger LA size compared with those without AF recurrence, with a weighted mean difference (WMD) 0.49 ([95% CI 0.39 to 0.59], P < 0.001), irrespective of the type of AF. A subgroup analysis showed LA diameter to be different; WMD was 2.29 ([95% CI 1.31 to 3.26], P < 0.001) in PAF and 1.51 ([95% CI 1.10 to 1.93], P < 0.001) in PeAF/L-PeAF, the difference between these two subgroups was not significant (Chi2=2.04, I2=51.1%, p=0.15). LA diameter ≥40 mm predicted AF recurrence HR:1.08 [95% CI 1.03 to 1.14], P=0.006), but the best cut-off value, in all included patients, was ≥50mm HR:2.73 [95% CI 1.64 to 4.55], P<0.001).Conclusions: Increased LA diameter significantly predicts recurrence of AF after ablation procedure. While a diameter of 40 mm predicts recurrence, a diameter more than 50 mm is the most accurate predictor.

Ämnesord

MEDICIN OCH HÄLSOVETENSKAP  -- Hälsovetenskap -- Folkhälsovetenskap, global hälsa, socialmedicin och epidemiologi (hsv//swe)

MEDICAL AND HEALTH SCIENCES  -- Health Sciences -- Public Health, Global Health, Social Medicine and Epidemiology (hsv//eng)

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