E3 PreliminaryModerate confidencePEM unclearMethods-PaperPeer-reviewedMachine draft
Core outcome measurement set for research and clinical practice in post-COVID-19 condition (long COVID) in children and young people: an international Delphi consensus study "PC-COS Children".
Seylanova, Nina, Chernyavskaya, Anastasia, Degtyareva, Natalia et al. · The European respiratory journal · 2024 · DOI
Quick Summary
This study developed a standardized list of health outcomes and measurement tools that doctors and researchers should use when evaluating children and young people with long COVID. International experts from 37 countries agreed on seven key areas to measure: fatigue, post-exertion symptoms, changes in work or school, and cardiovascular, neurological, gastrointestinal, and physical problems. They also identified specific questionnaires that work best for measuring fatigue, digestive symptoms, thinking problems, and overall functioning.
Why It Matters
For ME/CFS and long COVID patients, particularly children, standardized outcome measurement is critical for ensuring consistent evaluation across research studies and clinical care settings. This consensus framework enables better comparison of treatment effectiveness, more accurate tracking of disease severity, and improved clinical management. Having validated instruments for fatigue and post-exertional symptoms—hallmark features of ME/CFS—supports rigorous, comparable research that can advance understanding and treatment of these debilitating conditions.
Observed Findings
- Seven critical health outcomes were identified as essential to measure in pediatric post-COVID-19: fatigue, post-exertion symptoms, work/occupational and study changes, and cardiovascular, neuro-cognitive, gastrointestinal, and physical functional changes.
- Four measurement instruments achieved consensus criteria: PedsQL multidimensional fatigue scale, PedsQL gastrointestinal symptom scales, PedsQL cognitive functioning scale, and EQ-5D for physical functioning.
- Consensus was not achieved for measuring cardiovascular outcomes, post-exertional malaise, or work/occupational and study changes despite their identification as critical outcomes.
- 214 participants from 37 countries contributed to the outcome prioritization process, with 72% completing both Delphi rounds.
Inferred Conclusions
- Standardized measurement frameworks are necessary to enable uniform evaluation and reporting of post-COVID-19 outcomes in children and young people across research and clinical settings.
- While validated pediatric-specific instruments exist for fatigue, gastrointestinal, and cognitive domains, significant measurement gaps remain in other critical domains such as post-exertional malaise and cardiovascular symptoms.
- International expert consensus can identify priority health outcomes, but additional development work is needed to create or validate appropriate measurement tools for complex, multisystem outcomes.
Remaining Questions
- What measurement instruments should be used to assess post-exertional malaise (post-exertion symptoms) in children, given that consensus was not achieved despite this being identified as a critical outcome?
What This Study Does Not Prove
This study does not establish which treatments are effective for long COVID in children, nor does it define the underlying biological mechanisms of post-COVID-19 condition. It also does not demonstrate that these outcome measures will detect clinically meaningful changes or that they are suitable for all populations with ME/CFS. The consensus process reflects expert opinion rather than empirical validation of instrument responsiveness or sensitivity in pediatric long COVID populations.
Tags
Symptom:Post-Exertional MalaiseCognitive DysfunctionFatigue
Phenotype:PediatricLong COVID Overlap
Method Flag:PEM Not DefinedExploratory Only
About the PEM badge: “PEM required” means post-exertional malaise was an explicit required diagnostic criterion for participant inclusion in this study — not that PEM was studied, observed, or discussed. Studies using criteria that do not require PEM (e.g. Fukuda, Oxford) are tagged “PEM not required”. How the atlas works →
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