For citations:

Skopin I.I., Otarov A.M., Kakhktsyan P.V., Asatryan T.V., Kurbanov Sh.M., Paronyan Kh.V. Aortic valve replacement in elderly and advanced age patients: analysis of preoperative risk factors. Complex Issues of Cardiovascular Diseases. 2018;7(4S):24-35. (In Russ.) https://doi.org/10.17802/2306-1278-2018-7-4S-24-35