Evidence map›Paper›PMID 34193983›Full record

SynthesisEye (London, England)2022

Optical coherence tomography angiography in Alzheimer's disease: a systematic review and meta-analysis.

Andreas Katsimpris, Aristotelis Karamaounas, Anna Maria Sideri, John Katsimpris, Ilias Georgalas, Petros Petrou

Open access · bronzeAbstract readMeta-AnalysisSystematic Review
In one paragraph

Synthesis in Eye (London, England), 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 27 papers, 2 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
27citing papers in PubMed, 2 pooled it
3.3field-weighted citation impact, top 7% of its field
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

27 citing papers in PubMed, 2 syntheses or guidelines pooled it, 36 citations in OpenAlex.

  1. Pooled it
  2. Pooled it
  3. Multimodal imaging in neuro-ophthalmology.Indian journal of ophthalmology · 2026
    Review
  4. Review
  5. Article
  6. Article
  7. Review
  8. Article
  9. Optical Coherence Tomography Angiography Retinal Imaging Associations With Burden of Small Vessel Disease and Amyloid Positivity in the Brain.Journal of neuro-ophthalmology : the official journal of the North American Neuro-Ophthalmology Society · 2025
    Article
  10. Review
  11. Article
  12. Review
  13. Article
  14. Observational
  15. Alzheimer's disease pathophysiology in the Retina.Progress in retinal and eye research · 2024
    Review
  16. Review
  17. Article
  18. Potential Retinal Biomarkers in Alzheimer's Disease.International journal of molecular sciences · 2023
    Review
  19. Review
  20. Review
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

6 authors at 2 institutions in 1 country.

Andreas KatsimprisFirst Ophthalmology Department, "G.Gennimatas" Hospital, National and Kapodistrian University of Athens, Athens, Greece. a.katsimpris@gna-gennimatas.gr.ORCID 0000-0002-5805-105X
Aristotelis KaramaounasFirst Ophthalmology Department, "G.Gennimatas" Hospital, National and Kapodistrian University of Athens, Athens, Greece.
Anna Maria SideriFirst Ophthalmology Department, "G.Gennimatas" Hospital, National and Kapodistrian University of Athens, Athens, Greece.
John KatsimprisDepartment of Ophthalmology, General Hospital of Patras "Agios Andreas", Patras, Greece.
Ilias GeorgalasFirst Ophthalmology Department, "G.Gennimatas" Hospital, National and Kapodistrian University of Athens, Athens, Greece.ORCID 0000-0002-6171-5865
Petros PetrouFirst Ophthalmology Department, "G.Gennimatas" Hospital, National and Kapodistrian University of Athens, Athens, Greece.
National and Kapodistrian University of Athens · GRAgios Andreas Hospital · GR

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundTo assess the association between optical coherence tomography angiography (OCTA) retinal measurements and Alzheimer's disease (AD).

methodsWe searched MEDLINE and EMBASE from inception up to October 28th, 2020 for studies assessing the association between OCTA retinal measurements and AD. Estimates from eligible studies were meta-analysed and pooled standardized mean differences (SMDs) between AD patients and healthy participants with corresponding 95% confidence intervals (95% CI) were calculated, using the Hartung-Knapp/Sidik-Jonkman random-effects method. In addition, we quantified the minimum strength on the risk ratio scale (E value) required for an unmeasured confounder to nullify these associations.

resultsTen eligible studies for our systematic review were identified through our search strategy. The pooled SMD between the retinal vessel density of AD patients and healthy participants in the whole superficial vascular plexus (SVP), parafoveal SVP and foveal avascular zone (FAZ) was -0.41 (95% CI: -0.69 to -0.13, p value = 0.01, I

conclusionsIn our study, whole and parafoveal SVP vessel density were inversely associated with AD. However, prospective longitudinal studies with larger sample sizes are needed to furtherly assess these associations.

Indexed as

Alzheimer DiseaseTomography, Optical CoherenceFluorescein AngiographyFovea CentralisHumansProspective StudiesRetinal Vessels

Identifiers

PMID34193983
PMCPMC9232568
OpenAlexW3175538631

What OpenQuestion holds

Textmetadata
Read underepoch 390

Registered trials

None linked

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.