Excessive daytime sleepiness predicts Aβ deposition
Excessive daytime sleepiness (EDS) appears to increase the long-term risk of amyloid β (Aβ) deposition, a recent study has shown.
Using self-reports, researchers determined EDS and napping patterns in 124 community-dwelling adults (mean age 60.1±9.8 years; 50 percent female). Almost a third (29 percent) of the participants were nappers while 24 percent had EDS. There was no significant correlation between EDS and napping (p=0.24).
Pittsburgh compound B positron emission tomography scans were performed after a mean follow-up duration of 15.7±3.4 years to assess Aβ deposition. At the time of imaging, 4.8 percent (n=6) had been diagnosed with mild cognitive impairment and 34.7 percent (n=43) were positive for Aβ deposits.
Participants with self-reported EDS were significantly more likely to test positive for Aβ deposits at follow-up (56.7 percent vs 28.0 percent; p=0.004).
After adjustments for covariates, multivariable logistic regression analysis showed that the risk of Aβ deposition was 2.75 times higher in those with EDS than in those without (odds ratio [OR], 2.75; 95 percent CI, 1.09–6.95; p=0.033).
A similar trend was observed for nappers. In unadjusted analysis, those with self-reported napping were twice as likely to test positive for Aβ deposits on follow-up than non-nappers, though significance was not reached (OR, 2.01; 0.91–4.50; p=0.091). This relationship was attenuated upon controlling for covariates (OR, 1.86; 0.73–4.75; p=0.194).
The findings indicate that EDS may be a low-cost, simple and noninvasive method with which patients can be risk-stratified according to likelihood of Aβ deposition, said researchers.