RETN and atrial fibrillation: Using Spearman’s rank-order correlation test, a strong positive correlation appeared between resistin levels in plasma and PVAT (r = 0.5933; P < 0.0001) in the whole group of patients, and a moderate correlation appeared in the AF group (r = 0.4782; P = 0.021) and the non-AF group (r = 0.4938; P < 0.0001).