TF and atrial fibrillation: Statistically significant differences were observed in urea at 36 weeks of PMA [AF 23 mg/dL (IQR 21–29 mg/dL) vs. TF 15 mg/dL (IQR 11.7–23 mg/dL); p = 0.026] and at the end of the intervention [AF 24 mg/dL (IQR 21–32 mg/dL) vs. TF 20 mg/dL (IQR 16–22 mg/dL); p = 0.018].