Inclusion Criteria:  Age from 18 years to 80 years inclusive. Performed cardiac surgery in IC conditions. The patient's consent to participate in this study.  Exclusion Criteria:  Lack of productive contact with the patient Any disorder in the central nervous system in the perioperative period (acute cerebrovascular accident, coma, posthypoxic encephalopathy), being on a ventilator. Unstable hemodynamics or hemodynamically significant rhythm disturbances Shocks of various etiologies Inability to provide respiratory protection, high risk of aspiration Refusal of the patient to participate in this study