Evidence map›Paper›PMID 34737559›Full record

ArticleInternational journal of chronic obstructive pulmonary disease

Interleukin-6 is a Strong Predictor of the Frequency of COPD Exacerbation Within 1 Year.

Hui Huang, Xiaodong Huang, Kaojuan Zeng, Fan Deng, Changqing Lin, Wenjie Huang

Registry-linked trialOpen access · goldAbstract read
In one paragraph

Article in International journal of chronic obstructive pulmonary disease. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT07339280 ("The Effect of Probiotics on the Degree of Dyspnea, Lung Function, and Inflammatory Mediators in Patients With Chronic Obstructive Pulmonary Disease), which is not on this map. Cited by 37 papers, 2 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
37citing papers in PubMed, 2 pooled it
5.7field-weighted citation impact, top 3% 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.

NCT07339280 naenrolling by invitationnot on this map

"The Effect of Probiotics on the Degree of Dyspnea, Lung Function, and Inflammatory Mediators in Patients With Chronic Obstructive Pulmonary Disease (COPD)."

TypeinterventionalSponsorUniversity Hospital of SplitRan2026 to 2030Enrolled60ConditionsCOPD, COPD (Chronic Obstructive Pulmonary Disease), Probiotic, Probiotic SupplementArmsProbiotic Capsule, placebo capsule
3 · Its place in the literature

Who cites it

37 citing papers in PubMed, 2 syntheses or guidelines pooled it, 64 citations in OpenAlex.

  1. Pooled it
  2. Frailty in COPD: Clinical Impact, Diagnosis, Biomarkers, and Management Strategies.International journal of chronic obstructive pulmonary disease · 2025
    Pooled it
  3. Review
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  10. The miR-146a/Human mutation · 2026
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  15. Observational
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  19. Article
  20. Is Disease Stability an Attainable Chronic Obstructive Pulmonary Disease Treatment Goal?American journal of respiratory and critical care medicine · 2025
    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.

Hui HuangThe First School of Clinical Medicine, Southern Medical University, Guangzhou, 510515, People's Republic of China.
Xiaodong HuangDepartment of Respiratory and Critical Care Medicine, Huizhou Municipal Central Hospital, Huizhou, 516001, People's Republic of China.
Kaojuan ZengDepartment of Respiratory and Critical Care Medicine, Huizhou Municipal Central Hospital, Huizhou, 516001, People's Republic of China.
Fan DengDepartment of Respiratory and Critical Care Medicine, Huizhou Municipal Central Hospital, Huizhou, 516001, People's Republic of China.
Changqing LinDepartment of Respiratory and Critical Care Medicine, Huizhou Municipal Central Hospital, Huizhou, 516001, People's Republic of China.
Wenjie HuangThe First School of Clinical Medicine, Southern Medical University, Guangzhou, 510515, People's Republic of China.
Huizhou Central People's Hospital · CNThird Affiliated Hospital of Southern Medical University · CN

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

purposePersistent chronic inflammation of chronic obstructive pulmonary disease (COPD) is associated with poor outcomes and frequently results in acute exacerbation. Predicting the number of exacerbations is important. Because interleukin 6 (IL-6) plays an important role in inducing and maintaining chronic inflammation, we sought to observe whether IL-6 measurement can predict the frequency of acute exacerbation of COPD.

methodsWe reviewed serum IL-6 concentrations of stable COPD patients from January 2016 to December 2017 and statistically analyzed them to determine the optimal threshold value to predict the frequency of COPD acute exacerbations. Outpatients with stable COPD were then recruited between January 2018 and December 2019 and grouped into a low IL-6 group and a high IL-6 group according to this threshold value. We then compared the number of exacerbations of COPD in 1 year between the two groups.

resultsWe reviewed data from 95 COPD patients, who had a median of 1.00 exacerbations in preceding year; 35 of these patients had no fewer than two. The median IL-6 concentration was 8.80 pg/mL. IL-6 and hs-CRP were positively correlated with frequency of acute exacerbation in the preceding year, COPD assessment test (CAT) score and British medical research council (mMRC) score, and negatively correlated with forced expiratory volume in one second as percentage of predicted value (FEV

conclusionAn IL-6 measurement of 14.030 pg/mL or more is a risk factor for ≥2 acute exacerbations of COPD in the following year.

Indexed as

Interleukin-6Pulmonary Disease, Chronic ObstructiveDisease ProgressionForced Expiratory VolumeHumansRespiratory Function TestsVital CapacityInterleukin-6biomarkershs-CRPIL-6predictionrisk factorstable COPD

Identifiers

PMID34737559
PMCPMC8560075
OpenAlexW3209115498

What OpenQuestion holds

Textmetadata
LicenceCC BY-NC
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.