The degree of left atrial structural remodeling impacts left ventricular ejection fraction in patients with atrial fibrillation

The extent of left atrial (LA) wall structural remodeling (fibrosis) detected by late gadolinium enhancementmagnetic resonance imaging (LGE-MRI) is correlated with advanced atrial fibrillation (AF). The concomitant occurrence of AF and left ventricular (LV) dysfunction is not uncommon. We studied the effect of LA fibrosis, a confounder of both AF and LV dysfunction, on LV ejection fraction (EF). For the analysis, we identified and included 384 patients from our retrospective AF database who underwent LGE-MRI and transthoracic echocardiography prior to AF ablation. Based on the degree of LA fibrosis, patients were categorized into four stages as: Utah 1 (35% fibrosis). The average pre-ablation LVEF was 60.5%+-8.5% (n=24) in Utah stage 1 patients, 55.7%+-10.3% (n=240) in Utah stage 2 patients, 51.7+-11.5% (n=90) in Utah stage 3 patients, and 48.9%+-11.6% (n=30) in Utah stage 4 patients (p