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Relationship between Diabetic Retinopathy and Systemic Neurodegenerative Diseases: A Systematic Review and Meta-analysis

  • Helene E. Pedersen
    Affiliations
    Department of Ophthalmology, Odense University Hospital, Odense, Denmark

    Research Unit of Ophthalmology, Department of Clinical Research, University of Southern Denmark, Odense, Denmark
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  • Caroline H. Sandvik
    Affiliations
    Department of Ophthalmology, Odense University Hospital, Odense, Denmark

    Research Unit of Ophthalmology, Department of Clinical Research, University of Southern Denmark, Odense, Denmark
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  • Yousif Subhi
    Affiliations
    Department of Ophthalmology, Zealand University Hospital, Roskilde, Denmark

    Department of Ophthalmology, Rigshospitalet, Glostrup, Denmark
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  • Jakob Grauslund
    Affiliations
    Department of Ophthalmology, Odense University Hospital, Odense, Denmark

    Research Unit of Ophthalmology, Department of Clinical Research, University of Southern Denmark, Odense, Denmark

    Steno Diabetes Center Odense, Odense University Hospital, Odense, Denmark
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  • Frederik N. Pedersen
    Correspondence
    Correspondence: Frederik N. Pedersen, MD, Department of Ophthalmology, Odense University Hospital, Kløvervænget 5, Entrance 132, 5000, Odense C, Denmark.
    Affiliations
    Department of Ophthalmology, Odense University Hospital, Odense, Denmark

    Research Unit of Ophthalmology, Department of Clinical Research, University of Southern Denmark, Odense, Denmark
    Search for articles by this author

      Topic

      To examine the potential role of systemic neurodegeneration, this study aimed to provide an overview of the available evidence on the relationship between diabetic retinopathy (DR) and systemic neurodegeneration.

      Clinical Relevance

      The association between DR and systemic neurodegeneration is inconsistent in the literature. A summary estimate on the measures of association is important to establish whether DR may be used as a risk marker of systemic neurodegeneration.

      Methods

      We searched the literature databases PubMed/MEDLINE, EMBASE, and Cochrane Library on October 3, 2020, for all observational studies on humans evaluating the association between DR and systemic neurodegenerative diseases. Two authors conducted the literature search, study selection, and data extraction in an independent fashion. Studies were reviewed qualitatively in text and quantitatively in meta-analyses. Heterogeneity was evaluated with Cochran’s Q and I2, and Funnel plot was used to investigate for skewed results and possible publication bias.

      Results

      We identified 27 eligible studies with a total of 1 398 041 patients with diabetes. Diagnosis of DR was made using fundus photography or examination (n = 20), health registries (n = 4), was self-reported (n = 1), or was not disclosed in the remaining studies. Neurodegenerative conditions studied were cognitive impairment (n = 23), Alzheimer’s disease (n = 3), and Parkinson’s disease (n = 1). In cross-sectional and longitudinal studies, respectively, presence of any DR was associated with present (odds ratio [OR], 1.57; 95% confidence interval [CI], 1.02–2.43, P = 0.043) and incident (OR, 2.36; 95% CI, 1.50–3.71, P = 0.00021) systemic neurodegeneration, but severity of DR was not associated with differences in systemic neurodegeneration (OR, 0.98; 95% CI, 0.45–2.15, P = 0.96).

      Conclusions

      In this systematic review, DR appears to be a marker of systemic neurodegeneration. Further studies are warranted to better elucidate the clinical practical implications of this relationship.

      Keywords

      Abbreviations and Acronyms:

      CI (confidence interval), DR (diabetic retinopathy), HR (hazard ratio), MMSE (Mini-Mental State Examination), NPDR (nonproliferative diabetic retinopathy), OR (odds ratio), PDR (proliferative diabetic retinopathy)
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