EFFICIENCY OF PULMONARY VEIN ISOLATION AND ABLATION OF FOCI OF ROTARY ACTIVITY IN PATIENTS WITH PERSISTENT ATRIAL FIBRILLATION oleh A. A. Kulikov, O. V. Sapel’nikov, T. M. Uskach, D. I. Cherkashin, N. B. Shlevkov, I. R. Grishin, H. F. Salam, R. S. Akchurin