Evaluation of Atrial Fibrosis in Atrial Fibrillation Patients with Three Different Methods.

Background The presence of atrial fibrosis has already been known as a risk factor for atrial fibrillation (AF) development. Objective We aimed to evaluate atrial fibrosis with previously defined three different methods, which were cardiac magnetic resonance imaging (C-MRI), echocardiographic strain imaging, and biomarkers, and show the relationship between these methods, in patients with AF scheduled for cryoballoon ablation. Method 30 patients were enrolled. Atrial T1 relaxation durations were measured using C-MRI before the procedure of atrial fibrillation catheter ablation. Fibroblast growth factor-21 (FGF-21) and fibroblast growth factor-23 (FGF-23) levels were measured at serum derived from the femoral artery (Peripheral FGF 21 and 23) and left atrium blood samples (Central FGF 21 and 23) before catheter ablation. Preprocedural transthoracic echocardiography was performed. The Median follow-up duration for atrial tachyarrhythmia (ATa) recurrence was 13 (12-18 months) months. Results The mean ages of the study group were 55.23 ± 12.37 years and there were 17 (56.7%) female patients in study population. There were negative correlations between post contrast T1 relaxation durations of both posterior and posterosuperior atrium, and central FGF-23 (r:-0.561; p=0.003; r:-0.624; p=0.001; Posterior T1 vs central FGF-23 levels and Posterosuperior T1 vs central FGF-23 levels respectively). The positive correlations were observed between postcontrast posterior T1 relaxation durations and left ventricle ejection fraction (r:0.671; p=0.001); left atrial emptying fraction (r:0.482; p=0.013); peak atrial longitudinal strain (r:0.605; p=0.001), and peak atrial contraction strain (r:0.604; p=0.001). Also negative correlation was observed between postcontrast posterior T1 relaxation durations, and left atrial volume index (r:-0.467; p=0.016). Conclusion Our studies showed that there are correlations between T1 mapping of atrial tissue, biomarkers, and atrial mechanics evaluated with transthoracic echocardiography. Our findings are significant as they demonstrate the compatibility of these techniques for the atrial fibrosis evaluation.