Evidence map›Paper›PMID 26194729›Full record

ArticleJournal of clinical sleep medicine : JCSM : official publication of the American Academy of Sleep Medicine2015

Nocturnal Hypoxemia Is Associated with White Matter Hyperintensities in Patients with a Minor Stroke or Transient Ischemic Attack.

Shiel K Patel, Patrick J Hanly, Eric E Smith, Wesley Chan, Shelagh B Coutts

Open access · bronzeAbstract read
In one paragraph

Article in Journal of clinical sleep medicine : JCSM : official publication of the American Academy of Sleep Medicine, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 20 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
20citing papers in PubMed, 1 pooled it
1.5field-weighted citation impact, top 19% 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

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

  1. Pooled it
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  19. Obstructive sleep apnea and stroke.Sleep medicine and disorders : international journal · 2018
    Article
  20. Hypoxia after stroke: a review of experimental and clinical evidence.Experimental & translational stroke medicine · 2016
    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

5 authors at 1 institution in 1 country.

Shiel K PatelClinical Neurosciences, Foothills Medical Centre, University of Calgary, Calgary, Alberta, Canada.
Patrick J HanlyMedicine, Foothills Medical Centre, University of Calgary, Calgary, Alberta, Canada.
Eric E SmithClinical Neurosciences, Foothills Medical Centre, University of Calgary, Calgary, Alberta, Canada.
Wesley ChanClinical Neurosciences, Foothills Medical Centre, University of Calgary, Calgary, Alberta, Canada.
Shelagh B CouttsClinical Neurosciences, Foothills Medical Centre, University of Calgary, Calgary, Alberta, Canada.
University of Calgary · CA

Funding

Canadian Institutes of Health Research
6 · The paper itself

Abstract

STUDY

objectivesObstructive sleep apnea (OSA) is a risk factor for stroke, which is modulated by accompanying nocturnal hypoxemia. White matter hyperintensities (WMH) share many of the same risk factors as stroke. The purpose of this study was to investigate whether OSA and nocturnal hypoxemia are associated with white matter disease in patients with minor stroke and transient ischemic attack.

methodsPatients with minor stroke or TIA were recruited. Level 3 diagnostic sleep testing was used to diagnose OSA and quantify nocturnal hypoxemia. Significant OSA was defined as respiratory disturbance index ≥ 15, and nocturnal hypoxemia was defined as oxyhemoglobin saturation < 90% for ≥ 12% of total monitoring time. WMH were assessed and quantified on FLAIR MRI. The volume of WMH was compared between those with and without significant OSA and between those with and without nocturnal hypoxemia.

resultsOne hundred nine patients were included. Thirty-four (31%) had OSA and 37 (34%) had nocturnal hypoxemia. Total WMH volume was significantly greater in the OSA than in the non-OSA groups (p = 0.04). WMH volume was also significantly higher in the hypoxic than the non-hypoxic groups (p = 0.001). Mutivariable analysis with adjustment for age, hypertension, and diabetes showed that nocturnal hypoxemia was independently associated with WMH volume (p = 0.03) but OSA was not (p = 0.29).

conclusionsWe conclude that nocturnal hypoxemia, predominantly related to OSA, is independently associated with WMH in patients who present with minor ischemic stroke and TIA and may contribute to its pathogenesis.

Indexed as

FemaleHumansHypoxiaIschemic Attack, TransientMaleMiddle AgedProspective StudiesRisk FactorsStrokeWhite MatterhypoxiaMRIobstructive sleep apneastrokeTIAwhite matter disease

Identifiers

PMID26194729
PMCPMC4661334
OpenAlexW1019587569

What OpenQuestion holds

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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.