Dementia has a significant impact on individuals, families, communities, and the economy. Alzheimer’s disease (AD) accounts for 60–80% of dementia cases. The APOE e4 allele is well known as the primary genetic risk factor for AD and dementia. Studies have also shown that sleep apnea increases the risk of dementia. Some research further suggests a possible interaction between sleep apnea and the APOE in dementia development; however, this relationship remains unclear. The purpose of this study is to synthesize evidence from the existing literature and report findings on the relationship between APOE, sleep apnea, and dementia. A systematic search of multiple databases was conducted using selected keywords. Articles were screened and selected according to predefined inclusion criteria. Only original, peer-reviewed articles published between 2000 and 2021 in English were included. Data from the included studies were extracted and summarized descriptively, including information on population characteristics, study design, key findings, and other relevant variables. Of the 328 records identified, 3 studies met inclusion criteria and were included in the final analysis. Their findings suggest a potential interaction between sleep apnea and APOE that may influence dementia risk. This review highlights the need for further research to clarify the role of sleep apnea in the APOE pathway and its contribution to dementia.
Ding et al. (2026) studied this question.