Neurophysiological Parameters in Patients after Coronary Bypass Grafting Depending on the Success of Dual-Task Rehabilitation

The effect of dual-task cognitive training on neurophysiological parameters of patients with postoperative cognitive dysfunction (POCD) in the early postoperative period of coronary artery bypass grafting (CABG) under cardiopulmonary bypass was examined. The study involved 96 male patients who underwent CABG. All patients underwent a detailed neuropsychological and electroencephalogram (EEG) analysis before and after CABG. On day 2 or 3 after surgery, all patients were diagnosed with POCD and randomly divided into two groups: a group who received training (n = 54) and a group with no training (n = 42). From days 3–4 of the postoperative period, a daily course of dual-task training (simultaneous performance of cognitive and physical tasks) was carried out. Repeated diagnostics for POCD was carried out at the end of the training course, on days 8–11. It was demonstrated that patients who successfully completed the training course (with no POCD on days 8–11) showed a postoperative power decrease in θ1-rhythm, while in all patients with POCD, these indices increased compared to preoperative data. Topographic changes in θ1 rhythm were detected in the left parietal areas, which may be indicative of the impaired perfusion in these regions of the brain.