Evidence map›Paper›PMID 21459855›Full record

ArticleThorax2011

Blood culture bottle culture of pleural fluid in pleural infection.

Sarah M Menzies, Najib M Rahman, John M Wrightson, Helen E Davies, Robert Shorten, Stephen H Gillespie, Christopher W H Davies, Nick A Maskell, Andrew A Jeffrey, Y C Gary Lee and 1 more

Abstract readControlled Clinical TrialMulticenter Study
PubMed Publisher
In one paragraph

Article in Thorax, 2011. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 54 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
54citing papers in PubMed, 1 pooled it
–field-weighted citation impact
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

54 citing papers in PubMed, 1 synthesis or guideline pooled it.

  1. Guideline
  2. Trial
  3. Article
  4. Review
  5. Article
  6. Article
  7. What is new in pleural infections?Breathe (Sheffield, England) · 2026
    Review
  8. Article
  9. Observational
  10. CMAJ : Canadian Medical Association journal = journal de l'Association medicale canadienne · 2025
    Article
  11. Article
  12. Article
  13. Article
  14. Pleural infection.CMAJ : Canadian Medical Association journal = journal de l'Association medicale canadienne · 2025
    Article
  15. Review
  16. Observational
  17. Article
  18. Article
  19. Article
  20. Diagnosis and management of pleural infection.Breathe (Sheffield, England) · 2023
    Review
4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

11 authors.

Sarah M MenziesUKCRC Oxford Respiratory Trials Unit, Churchill Hospital, Oxford, UK. drsmenzies@hotmail.com
Najib M Rahman
John M Wrightson
Helen E Davies
Robert Shorten
Stephen H Gillespie
Christopher W H Davies
Nick A Maskell
Andrew A Jeffrey
Y C Gary Lee
Robert J O Davies

Funding

Department of Health 1016Medical Research Council G0600475Medical Research Council G1001128
6 · The paper itself

Abstract

backgroundPleural infection is common, and has a >30% major morbidity and mortality-particularly when infection is caused by Gram-negative, Staphylococcus aureus or mixed aerobic pathogens. Standard pleural fluid culture is negative in ∼40% of cases. Culturing pleural fluid in blood culture bottles may increase microbial yield, and is cheap and easy to perform.

objectivesTo determine whether inoculating pleural fluid into blood culture bottles increases the culture positivity of pleural infection over standard laboratory culture, and to assess the optimum volume of inoculum to introduce.

methods62 patients with pleural infection were enrolled. Pairs of aerobic and anaerobic blood culture bottles were inoculated at the bedside with 2, 5 or 10 ml of pleural fluid, and two pleural fluid specimens were sent for standard culture. Pleural fluid from nine control patients was cultured to test for 'false-positive' results.

resultsThe addition of blood culture bottle culture to standard culture increased the proportion of patients with identifiable pathogens by 20.8% (20/53 (37.7%) to 31/53 (58.5%) (difference 20.8%, 95% CI difference 8.9% to 20.8%, p<0.001)). The second standard culture did not similarly improve the culture positivity (19/49 (38.8%) to 22/49 (44.9%) (difference 6.1%, 95% CI difference -2.5% to 6.1%, p=0.08)). The culture inoculum volume did not influence bacterial isolation frequency. The control fluids were culture negative.

conclusionsBlood culture bottle culture of infected pleural fluid increases microbial yield when used in addition to standard culture. This technique should be part of routine care.

Indexed as

AdultAgedAged, 80 and overBacteriaBacterial InfectionsBacteriological TechniquesBlood Specimen CollectionCase-Control StudiesFemaleHumansMaleMiddle AgedPleural DiseasesPleural EffusionProspective StudiesRespiratory Tract Infections

Identifiers

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Registered trials

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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.