Evidence map›Paper›PMID 29699986›Full record

ArticleThe British journal of ophthalmology2019

Resting nailfold capillary blood flow in primary open-angle glaucoma.

Clara C Cousins, Jonathan C Chou, Scott H Greenstein, Stacey C Brauner, Lucy Q Shen, Angela V Turalba, Patricia Houlihan, Robert Ritch, Janey L Wiggs, Paul A Knepper and 1 more

Open access · bronzeAbstract read
In one paragraph

Article in The British journal of ophthalmology, 2019. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 17 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
17citing papers in PubMed, 1 pooled it
3.0field-weighted citation impact, top 9% 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

17 citing papers in PubMed, 1 synthesis or guideline pooled it, 27 citations in OpenAlex.

  1. Pooled it
  2. Article
  3. Review
  4. Conjunctival Venular Hemodynamic Biomarkers in Glaucoma.Translational vision science & technology · 2025
    Article
  5. Article
  6. Review
  7. Article
  8. Article
  9. Article
  10. Article
  11. Article
  12. Article
  13. Article
  14. Article
  15. Identification of Candidate miRNA Biomarkers for Glaucoma.Investigative ophthalmology & visual science · 2019
    Article
  16. Article
  17. 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

11 authors at 4 institutions in 1 country.

Clara C CousinsDepartment of Ophthalmology, Massachusetts Eye and Ear, Harvard Medical School, Boston, Massachusetts, USA.ORCID 0000-0002-7874-0581
Jonathan C ChouDepartment of Ophthalmology, Massachusetts Eye and Ear, Harvard Medical School, Boston, Massachusetts, USA.
Scott H GreensteinDepartment of Ophthalmology, Massachusetts Eye and Ear, Harvard Medical School, Boston, Massachusetts, USA.
Stacey C BraunerDepartment of Ophthalmology, Massachusetts Eye and Ear, Harvard Medical School, Boston, Massachusetts, USA.
Lucy Q ShenDepartment of Ophthalmology, Massachusetts Eye and Ear, Harvard Medical School, Boston, Massachusetts, USA.
Angela V TuralbaDepartment of Ophthalmology, Massachusetts Eye and Ear, Harvard Medical School, Boston, Massachusetts, USA.
Patricia HoulihanDepartment of Ophthalmology, Massachusetts Eye and Ear, Harvard Medical School, Boston, Massachusetts, USA.
Robert RitchEinhorn Clinical Research Center, New York Eye and Ear Infirmary of Mount Sinai, New York, USA.
Janey L WiggsDepartment of Ophthalmology, Massachusetts Eye and Ear, Harvard Medical School, Boston, Massachusetts, USA.
Paul A KnepperDepartment of Ophthalmology, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA.
Louis R PasqualeDepartment of Ophthalmology, Massachusetts Eye and Ear, Harvard Medical School, Boston, Massachusetts, USA louis_pasquale@meei.harvard.edu.
Massachusetts Eye and Ear Infirmary · USBrigham and Women's Hospital · USNew York Eye and Ear Infirmary · USNorthwestern University · US

Funding

P30 Core Grant for Vision ResearchP30EY014104 · NEI · MASSACHUSETTS EYE AND EAR INFIRMARY · PI Janey L Wiggs · 2002 to 2026
$15.1M
Gene-Environment Interactions in GlaucomaR01EY015473 · NEI · MASSACHUSETTS EYE AND EAR INFIRMARY · PI PASQUALE, LOUIS ROBERT · 2005 to 2021
$8.3M
NEI NIH HHS P30 EY014104NEI NIH HHS R01 EY015473
6 · The paper itself

Abstract

BACKGROUND/

aimsAn altered haemodynamic profile for various ocular posterior segment capillary beds has been documented in primary open-angle glaucoma (POAG). POAG may also involve abnormal non-ocular blood flow, and the nailfold capillaries, which are not affected by elevated intraocular pressure (IOP), are readily assessable.

methodsWe measured resting nailfold capillary blood flow in 67 POAG and 63 control subjects using video capillaroscopy. Masked readers tracked blood column voids between consecutive, registered image sequence frames, measured vessel diameter and calculated blood flow. We used multiple logistic regression to investigate the relation between nailfold capillary blood flow and POAG. In secondary analyses, we stratified cases by maximum IOP and concurrent topical beta-blocker use.

resultsMean (±SD) blood flow in picolitres per second was 26.8±17.6 for POAG cases and 50.1±24.2 for controls (p<0.0001). After adjustment for demographic and clinical factors including blood pressure and pulse, every picolitre per second increase in resting nailfold blood flow was associated with a 6% (95% CI 0.92 to 0.96) reduced odds of POAG (p<0.0001). Similar relations between nailfold capillary blood flow and POAG were found for cases stratified by maximum known IOP and for cases stratified by concurrent topical beta-blocker use.

conclusionReduced resting nailfold capillary blood flow is present in POAG independent of covariates such as blood pressure, pulse and IOP.

Indexed as

AdultAgedAged, 80 and overBlood PressureCapillariesFemaleGlaucoma, Open-AngleHumansIntraocular PressureMaleMicroscopic AngioscopyMiddle AgedNailsRegional Blood FlowTonometry, OcularVisual Fieldsblood flowcapillariesnailfold video capillaroscopyprimary open-angle glaucoma

Identifiers

PMID29699986
PMCPMC6362805
OpenAlexW2801007780

What OpenQuestion holds

Textmetadata
LicenceCC BY-NC
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.