Evidence map›Paper›PMID 21660297›Full record

ReviewInternational journal of chronic obstructive pulmonary disease2011

Hypoxemia in patients with COPD: cause, effects, and disease progression.

Brian D Kent, Patrick D Mitchell, Walter T McNicholas

Registry-linked trialOpen access · goldAbstract readReview
In one paragraph

Review in International journal of chronic obstructive pulmonary disease, 2011. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT07512687 (Impact of Ambulatory Oxygen Delivery on Real-world Activity and Quality-of-life in Patients With Interstitial Lung Disease), which is not on this map. Cited by 233 papers, 4 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
233citing papers in PubMed, 4 pooled it
16.0field-weighted citation impact, top 1% 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.

NCT07512687 narecruitingnot on this mapstarted 2026, after this paper: background citation

Impact of Ambulatory Oxygen Delivery on Real-world Activity and Quality-of-life in Patients With Interstitial Lung Disease (ILD) and Chronic Obstructive Pulmonary Disease (COPD)

TypeinterventionalSponsorState University of New York at BuffaloRan2026 to 2027Enrolled24ConditionsInterstitial Lung Disease, Chronic Obstructive Pulmonary Disease, HypoxemiaArmsPortable Oxygen Concentrator, Portable compressed oxygen D-tanks, No ambulatory oxygen therapy
3 · Its place in the literature

Who cites it

233 citing papers in PubMed, 4 syntheses or guidelines pooled it, 434 citations in OpenAlex.

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  4. Can Hypoxic Conditioning Improve Bone Metabolism? A Systematic Review.International journal of environmental research and public health · 2019
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173 more citing papers are in PubMed but not listed here.

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

3 authors at 2 institutions in 1 country.

Brian D KentPulmonary and Sleep Disorders Unit, St. Vincent's University Hospital, Dublin, Ireland. brian.kent@ucd.ie
Patrick D Mitchell
Walter T McNicholas
St. Vincent's University Hospital · IEUniversity College Dublin · IE

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Chronic obstructive pulmonary disease (COPD) is a leading cause of death and disability internationally. Alveolar hypoxia and consequent hypoxemia increase in prevalence as disease severity increases. Ventilation/perfusion mismatch resulting from progressive airflow limitation and emphysema is the key driver of this hypoxia, which may be exacerbated by sleep and exercise. Uncorrected chronic hypoxemia is associated with the development of adverse sequelae of COPD, including pulmonary hypertension, secondary polycythemia, systemic inflammation, and skeletal muscle dysfunction. A combination of these factors leads to diminished quality of life, reduced exercise tolerance, increased risk of cardiovascular morbidity, and greater risk of death. Concomitant sleep-disordered breathing may place a small but significant subset of COPD patients at increased risk of these complications. Long-term oxygen therapy has been shown to improve pulmonary hemodynamics, reduce erythrocytosis, and improve survival in selected patients with severe hypoxemic respiratory failure. However, the optimal treatment for patients with exertional oxyhemoglobin desaturation, isolated nocturnal hypoxemia, or mild-to-moderate resting daytime hypoxemia remains uncertain.

Indexed as

Pulmonary Gas ExchangeDisease ProgressionExerciseHumansHypertension, PulmonaryHypoxiaInflammationMuscle, SkeletalOxygen Inhalation TherapyPolycythemiaPulmonary AlveoliPulmonary Disease, Chronic ObstructiveSeverity of Illness IndexSleepTreatment OutcomeCOPDhypoxiainflammationpulmonary hypertensionsleep

Identifiers

PMID21660297
PMCPMC3107696
OpenAlexW1977925028

What OpenQuestion holds

Textmetadata
Read underepoch 390

Registered trials

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.