[Bilingualism as a factor in the protection of Alzheimer's disease: a systematic review].

Autor:	Deví-Bastida J; Universitat Autònoma de Barcelona, Bellaterra, España.; INAD-CAEMIL-Parc de Salut Mar, Santa Coloma de Gramanet, España., Català-Suñé N; Universitat Autònoma de Barcelona, Bellaterra, España., Jofre-Font S; Hospital Quironsalud del Vallés, Sabadell, España.
Jazyk:	Spanish; Castilian
Zdroj:	Revista de neurologia [Rev Neurol] 2020 Nov 16; Vol. 71 (10), pp. 353-364.
DOI:	10.33588/rn.7110.2020160
Abstrakt:	Introduction: Alzheimer's disease (AD) is the most prevalent type of dementia today, with an incidence estimated at 30% of the population over 85 years of age, which is why it represents a health problem in today's society. Aim: To know if bilingualism can act as a protection factor for AD, thus increasing cognitive reserve. Subjects and Methods: We searched for studies in the PsychInfo, Pubmed, Psicodoc, Medline and PubPych databases, based on the combination of various terms related to the keywords. Finally, ten studies were included. Results: Seven of the ten selected studies suggest a significantly positive relationship between bilingualism and AD, although on the contrary two of the remaining studies find a partial relationship, where there is only a relationship in very specific circumstances (in the first one there is only one positive relationship when there is a low level of education, while in the second one there is only a relationship when more than two languages are spoken); only one of the studies found no significant relationship between bilingualism and AD. Conclusions: The aforementioned studies have found a delay at the time of diagnosis or at the onset of clinically significant symptoms, between 4.5 years and 7 years; thus, bilingualism could be considered a contributing factor of the cognitive reserve and as a consequence a probable protection factor to prevent or slow the onset of AD and its subsequent progression.
Databáze:	MEDLINE
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