Selenium concentrations in elderly people with Alzheimer’s disease: a cross-sectional study with control group - Revista Brasileira de Enfermagem

ABSTRACT

Objective:

To investigate possible differences in plasma and erythrocyte concentrations of selenium among elderly with and without a diagnosis of Alzheimer’s disease (AD).

Methods:

Cross-sectional study, performed with an elderly group with Alzheimer’s disease, diagnosed by a geriatric doctor, and compared to an elderly group without the disease, equaling gender, education, and age. Atomic absorption spectrophotometry determined plasma and erythrocyte concentrations of total selenium (Se_t).

Results:

The mean age was 74.41±7.1 years in the Alzheimer’s disease group and 71.46±5.1 years among the control group. The Alzheimer’s disease group presented lower plasma concentrations (mean of 45.29±14.51 µg/dL vs. 55.14±14.01 µg/dL; p=0.004), and erythrocyte Se_t (median of 56.36 µg/L vs. 76.96 µg/L; p<0.001). The logistic regression model indicated an association between erythrocyte Se_t concentrations and diagnosis of Alzheimer’s disease (p=0.028).

Conclusion:

Elderly with Alzheimer’s disease present lower selenium concentrations in the evaluated organic compartments.