Assessment of long-term cognitive dysfunction in older patients who undergo heart surgery

Introduction: Older patients are more likely to have cognitive dysfunction, and a great proportion of patients undergone surgical procedures are older adults. Postoperative cognitive dysfunction (POCD) has been shown as a consistent complication after major surgical procedures such as heart surgery. Aim: To determine the presence of long-term POCD in >= 65-year-old patients undergoing coronary artery bypass grafting and aortic valve replacement, and to establish related risk factors. Methods: We prospectively and sequentially included 44 patients with coronary disease and aortic stenosis scheduled for heart surgery. Follow-up of all patients was standardized and a neurocognitive evaluation were performed preoperatively and at 1, 6 and 12 months after surgery. Results: Patients experienced a significantly postoperative cognitive dysfunction (33.5%, 63.4% and 38.9% at 1, 6 and 12 months, respectively) from baseline (20.5%). Patient-associated aspects such as age (p < 0.01), history of smoking (p < 0.01), arterial hypertension (p = 0.022), diabetes mellitus (p = 0.024), heart failure (p = 0.036) and preoperative cognitive dysfunction (p < 0.01), and surgery-associated aspects such as EuroSCORE (p < 0.01) and operation time (p < 0.01) were identified as related risk factors. Conclusions: Older patients who underwent heart surgery had long-term POCD. Both patient and surgery-related risk factors were established as related risk factors. These findings suggest that the prevalence of cognitive dysfunction after cardiac surgery in older patients could be related to a possible progression to dementia. In addition, many of the risk factors identified may be modifiable but in practice, these patients are not attended to for their possible cognitive impairment. (c) 2020 Sociedad Espanola de Neurologia. Published by Elsevier Espana, S.L.U. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/ 4.0/).