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Cerebrovascular Correlates of Dementia in Rural Communities - The Three Villages Study

9. oktober 2019 oppdatert av: Oscar H. Del Brutto, Universidad de Especialidades Espiritu Santo

Cerebrovascular Correlates of Dementia in Community-dwelling Older Adults Living in Remote Rural Communities - The Three Villages Study. Methodology and Operational Definitions.

This study aims to assess the prevalence and severity of dementia in an established cohort of community-dwelling older adults living in three neighboring rural Ecuadorian villages (Atahualpa, El Tambo, and Prosperidad), as well as to evaluate clinical and neuroimaging correlates of dementia in the study population. By the use of the Clinical Dementia Rating Scale (CDRS), the study also aims to assess the lower cutoff of the MoCA that better correlates with the occurrence of dementia in the study population. In addition, this study will provides grounds for the initiation of a prospective cohort study to assess factors influencing the development of dementia in the follow-up.

Studieoversikt

Status

Rekruttering

Forhold

Intervensjon / Behandling

Detaljert beskrivelse

The Three Villages Study is a population-based prospective cohort study designed to reduce the increasing burden of cognitive decline and dementia in rural Ecuador. Before the study, our Executive Committee met with community leaders to explain the aims of the study and to learn about the culture and traditions of villagers. Field personnel were trained to assure uniformity in data collection. With the aid of satellite view (Google Earth, Google Inc., Mountain View, CA), updated sketches of the villages were performed to identify blocks and houses.

The study initially will follow a 3-Phase cross-sectional design. During Phase I, Atahualpa, El Tambo, and Prosperidad residents aged 60 years or more will be identified by means of a door-to-door survey and interviewed with validated questionnaires to identify those with relevant risk factors and suspected conditions of interest. In Phase II, certified neurologists will examine suspected cases as well as random samples of negative individuals, to assess reliability of field instruments and to determine prevalence of the investigated conditions. In Phase III, enrolled individuals will be invited to undergo complementary tests. Thereafter, incoming residents will be recruited and followed-up by means of yearly door-to-door surveys and other overlapping sources to estimate incidence of the disorders of interest.

Studietype

Observasjonsmessig

Registrering (Forventet)

600

Kontakter og plasseringer

Denne delen inneholder kontaktinformasjon for de som utfører studien, og informasjon om hvor denne studien blir utført.

Studiesteder

  • Ecuador
    • Guayas
      • Samborondon, Guayas, Ecuador, 092301
        • Rekruttering
        • Universidad de Especialidades Espiritu Santo
        • Ta kontakt med:
        • Ta kontakt med:
    • Santa Elena
      • Atahualpa, Santa Elena, Ecuador
        • Rekruttering
        • Community center
        • Ta kontakt med:

Deltakelseskriterier

Forskere ser etter personer som passer til en bestemt beskrivelse, kalt kvalifikasjonskriterier. Noen eksempler på disse kriteriene er en persons generelle helsetilstand eller tidligere behandlinger.

Kvalifikasjonskriterier

Alder som er kvalifisert for studier

60 år og eldre (Voksen, Eldre voksen)

Tar imot friske frivillige

Nei

Kjønn som er kvalifisert for studier

Alle

Prøvetakingsmetode

Ikke-sannsynlighetsprøve

Studiepopulasjon

Atahualpa, el Tambo and Prosperidad are representative of rural villages of Coastal Ecuador, and were selected because they achieve several requisites to be considered optimal settings for the practice of epidemiological studies. The villages have a low index of migration rate. Inhabitants are homogeneous regarding race/ethnicity, lifestyles and diet, which is rich in oily fish. Residents are Ecuadorian natives with little evidence of cross-breading (Amerindians). Almost all men belong to the blue-collar class and most women are homemakers.

Beskrivelse

Inclusion Criteria: Individuals aged 60 years of more residing in Atahualpa, El Tambo, and Prosperidad, who signed a comprehensive informed consent form.

-

Exclusion Criteria: Severely disabled individuals in whom interviews and procedures cannot be performed

-

Studieplan

Denne delen gir detaljer om studieplanen, inkludert hvordan studien er utformet og hva studien måler.

Hvordan er studiet utformet?

Designdetaljer

  • Observasjonsmodeller: Kohort
  • Tidsperspektiver: Potensielle

Kohorter og intervensjoner

Gruppe / Kohort
Intervensjon / Behandling
The Three Villages Cohort
Individuals aged 60 years or more identified by means of door-to-door surveys, living in Atahualpa, El Tambo, and Prosperidad. Individuals will be interviewed with validated field instruments, and there will be invited for the practice of complementary exams to recognize markers of aterosclerosis and cerebral small vessel disease.
Diagnostisk test: Neuroimaging studies
Complementary exams are not invasive and will be performed in enrolled individuals who sign a comprehensive informed consent form
Andre navn:
  • Ultrasound examinations
  • Ankle-brachial index determinations

Hva måler studien?

Primære resultatmål

Resultatmål
Tiltaksbeskrivelse
Tidsramme
To assess the prevalence and severity of dementia in the study population
Tidsramme: One year
The Clinical Dementia Rating Scale will be applied to all participants
One year
To assess cerebrovascular correlates of mild cognitive impairment and dementia in the study population
Tidsramme: One year
Neuroimaging studies, ultrasound examination of extracranial carotid arteries, and ankle-brachial index determinations will be used to assess the presence of large vessel aterosclerosis and cerebral small vessel disease in the study population
One year
To assess cognitive decline in the follow-up
Tidsramme: five years
Enrolled individuals will be prospectively followed every year for up to five years, and will be re-assessed to determine the progression of cognitive impairment and its relationship with markers of aterosclerosis and cerebral small vessel disease
five years

Sekundære resultatmål

Resultatmål
Tiltaksbeskrivelse
Tidsramme
To assess cutoffs of the Montreal Cognitive Assessment useful to differentiate normal cognitivion from mild cognitive impairment, and mild cognitive impairment to dementia in the study population
Tidsramme: five years
The MoCA was mainly designed to separate normal individuals to those with MCI. However, a major limitation of the MoCA is its lack of accuracy for identifying persons with dementia. Therefore, the use of more complex field instruments (yet, feasible to apply in individuals living in rural settings) is needed to determine the burden of dementia and its cerebrovascular correlates in rural communities. In this regard, the Clinical Dementia Rating Scale (CDRS) is a useful tool to assess people living in these settings for establishing the burden and severity of dementia as well as to further assess clinical and neuroimaging correlates of this condition.
five years

Samarbeidspartnere og etterforskere

Det er her du vil finne personer og organisasjoner som er involvert i denne studien.

Sponsor

Universidad de Especialidades Espiritu Santo

Publikasjoner og nyttige lenker

Den som er ansvarlig for å legge inn informasjon om studien leverer frivillig disse publikasjonene. Disse kan handle om alt relatert til studiet.

Generelle publikasjoner

Studierekorddatoer

Disse datoene sporer fremdriften for innsending av studieposter og sammendragsresultater til ClinicalTrials.gov. Studieposter og rapporterte resultater gjennomgås av National Library of Medicine (NLM) for å sikre at de oppfyller spesifikke kvalitetskontrollstandarder før de legges ut på det offentlige nettstedet.

Studer hoveddatoer

Studiestart (Faktiske)

1. juni 2019

Primær fullføring (Forventet)

30. juni 2020

Studiet fullført (Forventet)

30. juni 2024

Datoer for studieregistrering

Først innsendt

9. oktober 2019

Først innsendt som oppfylte QC-kriteriene

9. oktober 2019

Først lagt ut (Faktiske)

10. oktober 2019

Oppdateringer av studieposter

Sist oppdatering lagt ut (Faktiske)

10. oktober 2019

Siste oppdatering sendt inn som oppfylte QC-kriteriene

9. oktober 2019

Sist bekreftet

1. oktober 2019

Mer informasjon

Begreper knyttet til denne studien

Nøkkelord

Ytterligere relevante MeSH-vilkår

Andre studie-ID-numre

  • 201901UEES

Plan for individuelle deltakerdata (IPD)

Planlegger du å dele individuelle deltakerdata (IPD)?

Ja

IPD-planbeskrivelse

Dta will be available after reasonable request from an investigator for a similar study

IPD-delingstidsramme

June 2020

Tilgangskriterier for IPD-deling

email to the principal investigator

IPD-deling Støtteinformasjonstype

  • Studieprotokoll
  • Statistisk analyseplan (SAP)
  • Informert samtykkeskjema (ICF)
  • Klinisk studierapport (CSR)

Legemiddel- og utstyrsinformasjon, studiedokumenter

Studerer et amerikansk FDA-regulert medikamentprodukt

Nei

Studerer et amerikansk FDA-regulert enhetsprodukt

Nei

produkt produsert i og eksportert fra USA

Nei

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Kliniske studier på Neuroimaging studies

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