CRP and atrial fibrillation: Chen and co-workers found that serum 25-(OH) Vitamin D level correlated with high-sensitivity C-reactive protein and left atrial diameter, and was significantly associated with AF in Chinese patients with non-valvular persistent AF.21 Hanafy et al.22 revealed the direct electromechanical effects on the left atrium after Vitamin D administration, and found that Vitamin D could effectively prevent or terminate AF.