Evidence map›Paper›PMID 34727907›Full record

ArticleBMC pulmonary medicine2021

Repeated bronchoscopy in health and obstructive lung disease: is the airway microbiome stable?

Rune Nielsen, Yaxin Xue, Inge Jonassen, Ingvild Haaland, Øyvind Kommedal, Harald G Wiker, Christine Drengenes, Per S Bakke, Tomas M L Eagan

Open access · goldAbstract readComparative Study
In one paragraph

Article in BMC pulmonary medicine, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 7 papers.

0numbers the graph read from it
0cells of the map it votes in
7citing papers in PubMed
0.5field-weighted citation impact, top 37% 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

7 citing papers in PubMed, 7 citations in OpenAlex.

  1. Journal of bacteriology · 2026
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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

9 authors at 2 institutions in 1 country.

Rune Nielsen *Department of Clinical Science, Faculty of Medicine, University of Bergen, Postboks 7804, 5020, Bergen, Norway. rune.nielsen@uib.no.
Yaxin Xue *Computational Biology Unit, Department of Informatics, University of Bergen, Bergen, Norway.
Inge JonassenComputational Biology Unit, Department of Informatics, University of Bergen, Bergen, Norway.
Ingvild HaalandDepartment of Clinical Science, Faculty of Medicine, University of Bergen, Postboks 7804, 5020, Bergen, Norway.
Øyvind KommedalDepartment of Microbiology, Haukeland University Hospital, Bergen, Norway.
Harald G WikerDepartment of Clinical Science, Faculty of Medicine, University of Bergen, Postboks 7804, 5020, Bergen, Norway.
Christine DrengenesDepartment of Clinical Science, Faculty of Medicine, University of Bergen, Postboks 7804, 5020, Bergen, Norway.
Per S BakkeDepartment of Clinical Science, Faculty of Medicine, University of Bergen, Postboks 7804, 5020, Bergen, Norway.
Tomas M L EaganDepartment of Clinical Science, Faculty of Medicine, University of Bergen, Postboks 7804, 5020, Bergen, Norway.
University of Bergen · NOHaukeland University Hospital · NO

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

objectiveLittle is known concerning the stability of the lower airway microbiome. We have compared the microbiota identified by repeated bronchoscopy in healthy subjects and patients with ostructive lung diseaseases (OLD).

methods21 healthy controls and 41 patients with OLD completed two bronchoscopies. In addition to negative controls (NCS) and oral wash (OW) samples, we gathered protected bronchoalveolar lavage in two fractions (PBAL1 and PBAL2) and protected specimen brushes (PSB). After DNA extraction, we amplified the V3V4 region of the 16S rRNA gene, and performed paired-end sequencing (Illumina MiSeq). Initial bioinformatic processing was carried out in the QIIME-2 pipeline, identifying amplicon sequence variants (ASVs) with the DADA2 algorithm. Potentially contaminating ASVs were identified and removed using the decontam package in R and the sequenced NCS.

resultsA final table of 551 ASVs consisted of 19 × 10

conclusionThe airways microbiota varied between examinations. However, there is compositional microbiota stability within a person, beyond that of chance, supporting the notion of a transient airways microbiota with a possibly more stable individual core microbiome.

Indexed as

MicrobiotaAgedAged, 80 and overAnti-Bacterial AgentsBronchoalveolar LavageBronchoalveolar Lavage FluidBronchoscopyClassificationHumansLung Diseases, ObstructiveMaleMiddle AgedRNA, Ribosomal, 16SSequence Analysis, DNAAnti-Bacterial AgentsRNA, Ribosomal, 16S16S rRNABronchoscopyCOPDMicrobiomeMicrobiotaNext generation sequencingReliabilityRepeatability

Identifiers

PMID34727907
PMCPMC8561866
OpenAlexW3210884884

What OpenQuestion holds

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LicenceCC BY
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.