Evidence map›Paper›PMID 28645980›Full record

ArticleBMJ open2017

Association between human herpesvirus infections and dementia or mild cognitive impairment: a systematic review protocol.

Charlotte Warren-Gash, Harriet Forbes, Judith Breuer, Andrew C Hayward, Angelique Mavrodaris, Basil H Ridha, Martin Rossor, Sara L Thomas, Liam Smeeth

Abstract read
In one paragraph

Article in BMJ open, 2017. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 2 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
2citing papers in PubMed, 1 pooled it
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

2 citing papers in PubMed, 1 synthesis or guideline pooled it.

  1. Pooled it
  2. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

9 authors.

Charlotte Warren-GashFaculty of Epidemiology and Population Health, London School of Hygiene and Tropical Medicine, London, UK.
Harriet ForbesFaculty of Epidemiology and Population Health, London School of Hygiene and Tropical Medicine, London, UK.
Judith BreuerDivision of Infection and Immunity, University College London, London, UK.
Andrew C HaywardInstitute of Epidemiology and Health Care, University College London, London, UK.
Angelique MavrodarisCambridge Institute of Public Health, Cambridge, Cambridgeshire, UK.
Basil H RidhaNIHR Queen Square Dementia Biomedical ResearchUnit, University College London, London, UK.
Martin RossorNIHR Queen Square Dementia Biomedical ResearchUnit, University College London, London, UK.
Sara L ThomasFaculty of Epidemiology and Population Health, London School of Hygiene and Tropical Medicine, London, UK.
Liam SmeethFaculty of Epidemiology and Population Health, London School of Hygiene and Tropical Medicine, London, UK.

Funding

Department of Health DRF-2014-07-164Wellcome Trust 201440/Z/16/Z
6 · The paper itself

Abstract

introductionPersisting neurotropic viruses are proposed to increase the risk of dementia, but evidence of association from robust, adequately powered population studies is lacking. This is essential to inform clinical trials of targeted preventive interventions. METHODS AND ANALYSIS: We will carry out a comprehensive systematic review of published and grey literature of the association between infection with, reactivation of, vaccination against or treatment of any of the eight human herpesviruses and dementia or mild cognitive impairment. We will search the Cochrane Library, Embase, Global Health, Medline, PsycINFO, Scopus, Web of Science, clinical trials registers, the New York Academy of Medicine Grey Literature Report, Electronic Theses Online Service through the British Library and the ISI Conference Proceedings Citation Index for randomised controlled trials, cohort, caseâ€"control, case crossover or self-controlled case series studies reported in any language up to January 2017. Titles, abstracts and full-text screening will be conducted by two researchers independently. Data will be extracted systematically from eligible studies using a piloted template. We will assess risk of bias of individual studies in line with the Cochrane Collaboration tool. We will conduct a narrative synthesis, grouping studies by exposure and outcome definitions, and will describe any differences by population subgroups and dementia subtypes. We will consider performing meta-analyses if there are adequate numbers of sufficiently homogeneous studies. The overall quality of cumulative evidence will be assessed using selected Grading of Recommendations, Assessment, Development and Evaluations criteria. ETHICS AND DISSEMINATION: As this is a review of existing studies, no ethical approval is required. Results will be disseminated through a peer-reviewed publication and at national and international conferences. We anticipate the review will clarify the current extent and quality of evidence for a link between herpesviruses and dementia, identify gaps and inform the direction of future research. PROSPERO REGISTRATION NUMBER: CRD42017054684.

Indexed as

Cognitive DysfunctionDementiaHerpesviridae InfectionsHumansResearch DesignSystematic Reviews as TopicVaccinationDementiaHuman herpesvirusesSystematic review protocol

Identifiers

PMID28645980
PMCPMC5726086

What OpenQuestion holds

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.