Observational studyThe European respiratory journal2021
Pulmonary function and radiological features 4 months after COVID-19: first results from the national prospective observational Swiss COVID-19 lung study.
Observational study in The European respiratory journal, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to 2 registered trials, which are not on this map. Cited by 254 papers, 8 of them syntheses that pooled it.
What it found
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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.
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.
Effects of Aerobic Exercise in People With Post-COVID-19: a Randomized Controlled Trial
Long-Term Respiratory and Peripheral Muscle Strength and Respiratory Function in Young COVID-19 Patients: A Cross-Sectional Study
Who cites it
254 citing papers in PubMed, 8 syntheses or guidelines pooled it, 420 citations in OpenAlex.
- The role of 6-minute walk test and pulmonary function testing in patients with post COVID-19 condition: a systematic review and meta-analysis.Family practice · 2026Pooled it
- Recovery of lung function during the first year after COVID-19: a systematic review and meta-analysis.European respiratory review : an official journal of the European Respiratory Society · 2025Pooled it
- Functional Recovery of Adults Following Acute COVID-19: A Systematic Review and Meta-Analysis.Physical therapy · 2025Pooled it
- Post-COVID-19 dyspnoea and pulmonary imaging: a systematic review and meta-analysis.European respiratory review : an official journal of the European Respiratory Society · 2023Pooled it
- Global prevalence and effect of comorbidities and smoking status on severity and mortality of COVID-19 in association with age and gender: a systematic review, meta-analysis and meta-regression.Scientific reports · 2023Pooled it
- Pulmonary function and chest computed tomography abnormalities 6-12 months after recovery from COVID-19: a systematic review and meta-analysis.Respiratory research · 2022Pooled it
- ESCMID rapid guidelines for assessment and management of long COVID.Clinical microbiology and infection : the official publication of the European Society of Clinical Microbiology and Infectious Diseases · 2022Guideline
- Short-term and Long-term Rates of Postacute Sequelae of SARS-CoV-2 Infection: A Systematic Review.JAMA network open · 2021Pooled it
- Effects of incentive spirometer added to standard rehabilitation in previously hospitalized adults with post-COVID-19 condition: a randomized controlled trial.Journal of rehabilitation medicine · 2026Trial
- Pirfenidone in post-COVID-19 pulmonary fibrosis (FIBRO-COVID): a phase 2 randomised clinical trial.The European respiratory journal · 2025Trial
- Persistent pulmonary pathology after COVID-19 is associated with high viral load, weak antibody response, and high levels of matrix metalloproteinase-9.Scientific reports · 2021Trial
- LongitudinalJournal of magnetic resonance imaging : JMRI · 2026Article
- Supplementation of αKG along with TGFβ/HIF1α antagonist rescues lung fibrosis in mice with severe SARS-CoV-2 infection.Journal of translational medicine · 2026Article
- Folic Acid and Endothelial Dysfunction in COVID-19.Life (Basel, Switzerland) · 2026Review
- Functional alterations due to post-COVID-19 lung lesions - lessons from a multicenter V/Q SPECT/CT based registry.European journal of nuclear medicine and molecular imaging · 2026Article
- Functional alterations due to post-COVID-19 lung lesions - lessons from a multicenter V/Q SPECT/CT based registry.European journal of nuclear medicine and molecular imaging · 2026Article
- Current status and future perspectives on the mechanistic and pathophysiological understanding of long COVID.Communications medicine · 2026Article
- Methylprednisolone in the management of post-COVID-19 interstitial lung disease: A randomized trial (STERCOV-ILD).Sarcoidosis, vasculitis, and diffuse lung diseases : official journal of WASOG · 2026Article
- Chronic Pulmonary Complications After COVID-19: An Observational Study of Postinfection Lung Changes Over 2 Years.CHEST pulmonary · 2026Article
- Incentive Spirometer in COVID-19: A Systematic Review.Journal of clinical medicine · 2026Review
194 more citing papers are in PubMed but not listed here.
Corrections and comments
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Authors and funding
18 authors at 10 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundThe infectious coronavirus disease 2019 (COVID-19) pandemic is an ongoing global healthcare challenge. Up to one-third of hospitalised patients develop severe pulmonary complications and acute respiratory distress syndrome. Pulmonary outcomes following COVID-19 are unknown.
methodsThe Swiss COVID-19 lung study is a multicentre prospective cohort investigating pulmonary sequelae of COVID-19. We report on initial follow-up 4 months after mild/moderate or severe/critical COVID-19 according to the World Health Organization severity classification.
results113 COVID-19 survivors were included (mild/moderate n=47, severe/critical n=66). We confirmed several comorbidities as risk factors for severe/critical disease. Severe/critical disease was associated with impaired pulmonary function,
conclusions4 months after severe acute respiratory syndrome coronavirus 2 infection, severe/critical COVID-19 was associated with significant functional and radiological abnormalities, potentially due to small-airway and lung parenchymal disease. A systematic follow-up for survivors needs to be evaluated to optimise care for patients recovering from COVID-19.
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What OpenQuestion holds
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.