**4.3 Left atrial diameter, left atrial volume**

Liu et al. reported that left atrial diameter (LAD) contributes to the prognosis of patients with AF after catheter ablation [24]. Moreover, Pinto et al. reported that left atrial appendage volume contributes to AF recurrence [25]. In contrast, Masuda et al. [26] reported that LAD and AF recurrence are not correlated; thus, whether they are related remains controversial. In contrast, a review article of a meta-analysis reported that left atrial volume is a predictor of atrial fibrillation recurrence [27].
