Abstract
The risk of cognitive impairment is higher in people with CKD than in the general population. The complex relationship between CKD and cognitive dysfunction has not been extensively characterized. Here, we review epidemiological associations, specific patterns of CKD-related cognitive impairment, the underlying mechanisms, and recently published data on relevant biomarkers. Despite some discrepancies, recent published studies have confirmed that CKD is associated with cognitive function (e.g. incident cognitive events). Although patients with CKD often exhibit impairments in executive functions and attention, it is noteworthy that other cognitive functions (e.g. memory) can be preserved. The key mechanisms described recently include vascular damage, genetic factors, the accumulation of uremic toxins, disruption of the blood-brain barrier, glymphatic system dysfunction, and changes in the gut-brain axis. Kidney function is increasingly seen as a game changer in the interpretation of biomarkers of cognitive impairment and, especially, hallmarks of Alzheimer disease. The data reviewed here highlight the need for interdisciplinary collaboration between nephrologists and neurologists in the care of patients with CKD at risk of cognitive impairment. In order to further improving diagnosis and therapy, future research must elucidate the mechanisms underlying the CKD-cognitive impairment association and confirm the value of biomarkers.
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