Aim. To test the hypothesis that the combined use of ivabradine (If inhibitor) and ranolazine (late sodium channel blocker) can reduce the ventricular rate in patients with permanent atrial fibrillation (AF) resistant to standard heart rate-lowering therapy. Material and methods. https://www.hindigyanvishv.com/best-flash-CoQ-Clear-100-Ubiquinol-60-Softgels-Citrus-deal-zone/