Prevalence of dementia and mild cognitive impairment in indigenous Bolivian forager-horticulturalists.
california; mission viejo
INTRODUCTION: We evaluated the prevalence of dementia and mild cognitive impairment (MCI) in indigenous Tsimane and Moseten, who lead a subsistence lifestyle.
METHODS: Participants from population-based samples ≥ 60 years of age (n = 623) were assessed using adapted versions of the Modified Mini-Mental State Examination, informant interview, longitudinal cognitive testing and brain computed tomography (CT) scans.
RESULTS: Tsimane exhibited five cases of dementia (among n = 435; crude prevalence = 1.2%, 95% confidence interval [CI]: 0.4, 2.7); Moseten exhibited one case (among n = 169; crude prevalence = 0.6%, 95% CI: 0.0, 3.2), all age ≥ 80 years. Age-standardized MCI prevalence was 7.7% (95% CI: 5.2, 10.3) in Tsimane and 9.8% (95% CI: 4.9, 14.6) in Moseten. Cognitive impairment was associated with visuospatial impairments, parkinsonian symptoms, and vascular calcification in the basal ganglia.
DISCUSSION: The prevalence of dementia in this cohort is among the lowest in the world. Widespread intracranial medial arterial calcifications suggest a previously unrecognized, non-Alzheimer's disease (AD) dementia phenotype.
Neurosciences (Brain & Spine)
Gatz, Margaret; Mack, Wendy J; Chui, Helena C; Law, E Meng; Barisano, Giuseppe; Sutherland, M Linda; Sutherland, James D; Eid Rodriguez, Daniel; Quispe Gutierrez, Raul; Copajira Adrian, Juan; Bani Cuata, Jesus; Borenstein, Amy R; Walters, Ellen E; Irimia, Andrei; Rowan, Christopher J; Wann, L Samuel; Allam, Adel H; Thompson, Randall C; Miyamoto, Michael; Michalik, David E; Cummings, Daniel K; Seabright, Edmond; Garcia, Angela R; Hooper, Paul L; Kraft, Thomas S; Finch, Caleb E; Thomas, Gregory S; Stieglitz, Jonathan; Trumble, Benjamin C; Gurven, Michael D; and Kaplan, Hillard, "Prevalence of dementia and mild cognitive impairment in indigenous Bolivian forager-horticulturalists." (2022). Articles, Abstracts, and Reports. 5903.