Evidence map›Paper›PMID 34916263›Full record

ReviewThe European respiratory journal2022

The environmental impact of inhaled therapy: making informed treatment choices.

Ashley Woodcock, Kai M Beeh, Hironori Sagara, Simon Aumônier, Emmanuel Addo-Yobo, Javaid Khan, Jørgen Vestbo, Helen Tope

Open access · bronzeAbstract readReview
In one paragraph

Review in The European respiratory journal, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 42 papers, 3 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
42citing papers in PubMed, 3 pooled it
5.6field-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.

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

42 citing papers in PubMed, 3 syntheses or guidelines pooled it, 77 citations in OpenAlex.

  1. Pooled it
  2. Pooled it
  3. Pooled it
  4. Trial
  5. Article
  6. Article
  7. Behaviour change intervention for inhaler disposal, Spain.Bulletin of the World Health Organization · 2026
    Article
  8. Article
  9. Article
  10. Article
  11. Article
  12. Article
  13. Article
  14. Observational
  15. Article
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  18. Environmental sustainability in asthma: reducing carbon footprint and medication wastage.Allergy, asthma, and clinical immunology : official journal of the Canadian Society of Allergy and Clinical Immunology · 2025
    Article
  19. Article
  20. Article
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

8 authors at 7 institutions in 6 countries.

Ashley WoodcockDivision of Infection, Immunity and Respiratory Medicine, School of Biological Sciences, University of Manchester, Manchester, UK ashley.woodcock@manchester.ac.uk.
Kai M BeehInsaf Respiratory Research Institute, Wiesbaden, Germany.
Hironori SagaraDept of Medicine, Division of Respiratory Medicine and Allergology, Showa University, Tokyo, Japan.ORCID 0000-0003-2376-1606
Simon AumônierERM: Environmental Resources Management, Oxford, UK.
Emmanuel Addo-YoboDept of Child Health, School of Medicine and Dentistry, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana.
Javaid KhanSection of Pulmonary and Critical Care Medicine, The Aga Khan University, Karachi, Pakistan.
Jørgen VestboDivision of Infection, Immunity and Respiratory Medicine, School of Biological Sciences, University of Manchester, Manchester, UK.ORCID 0000-0001-6355-6362
Helen TopePlanet Futures, Melbourne, Australia.
Manchester Academic Health Science Centre · GBAga Khan University · PKEnvironmental Resources Management (United Kingdom) · GBFutures Group (United States) · USKwame Nkrumah University of Science and Technology · GHRespiratory Research Institute · DEShowa University · JP

Funding

Department of Health
6 · The paper itself

Abstract

When selecting the best inhaler and drug combination for a patient with respiratory disease, a number of factors should be considered. While efficacy and safety of medical treatments are always a priority, in recent years the environmental impacts of all aspects of life have become an increasingly necessary consideration and inhaled therapies are no exception. The carbon footprint of an item, individual or organisation is one of the most important and quantifiable environmental impacts, assessed by the amount of greenhouse gases (often expressed in terms of carbon dioxide equivalents) generated throughout the life cycle. The two most commonly prescribed and manufactured inhaler types worldwide are pressurised metered-dose inhalers (pMDIs) containing hydrofluorocarbon (HFC) propellants and dry powder inhalers (DPIs). Most of the carbon footprint of current pMDIs is a result of the propellants that they contain (HFC-134a and HFC-227ea, which are potent greenhouse gases). In comparison, the powder in DPIs is dispersed by the patient's own inhalation, meaning DPIs do not contain a propellant and have a lower carbon footprint than most pMDIs currently available. Soft mist inhalers are another propellant-free option: the device contains a spring, which provides the energy to disperse the aqueous medication. In this review, we examine the published data on carbon footprint data for inhalers, providing an analysis of potential implications for treatment decision making and industry initiatives.

Indexed as

Greenhouse GasesAdministration, InhalationDry Powder InhalersEnvironmentHumansMetered Dose InhalersNebulizers and VaporizersGreenhouse Gases

Identifiers

PMID34916263
PMCPMC9301054
OpenAlexW4200413615

What OpenQuestion holds

Textmetadata
LicenceCC BY-NC
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.