Figure 2 The incidence of an increase of ≥20% from the baseline left atrial dimension and the change of left atrial dimension between the patients with pacing <3.3 years and ≥3.3 years(A) The difference in the incidence of an increase of ≥20% from the baseline left atrial dimension between patients with pacing duration <3.3 years and those with pacing duration ≥3.3 years was statistically significant (16.4% vs 24.9%; P=0.029). (B) Patients with pacing duration ≥3.3 years exhibited a higher mean change in left atrial dimension than did patients with pacing duration <3.3 years (3.3±6.2 mm vs 1.6±5.5 mm; P=0.002). (C) Patients with pacing duration ≥3.3 years exhibited a higher mean percentage of change in left atrial dimension than did patients with pacing duration <3.3 years (11.1±19.7% vs 5.6±16.8%; P=0.001). LAE – left atrial enlargement; LA – left atrium.