Effectiveness of particulate matter filtration: systematic review and meta-analysis.
Francieli Faustino, Helenize Ferreira Lima Leachi, Aline Franco da Rocha and 3 others
PMID 41849508WHAT IT FOUND
HEPA filtration significantly reduced particulate matter exposure and blood pressure in indoor settings.
The review found strong evidence for filtration effectiveness, though results varied across studies and the evidence was rated as preliminary.
Key findings
01HEPA filters demonstrated superiority in reducing particulate matter in ambient air, with a stated capture rate of 99.97%.
02A modest but statistically significant decrease in blood pressure was observed following the air filtration intervention.
03The meta-analysis showed significant heterogeneity between studies, indicating that the variability in results was not random.
STILL TO COME
How it was doneWhat they foundWhat it means for RNs
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What it does not show
The authors explicitly state that the study provides only preliminary evidence. There was significant heterogeneity in the meta-analysis, meaning the included studies varied widely in their results and measurements. Only seven of the forty-seven reviewed studies were included in the statistical meta-analysis, limiting the power of the combined estimate. Six of the included studies were assessed as having a high risk of bias.
Declared interests
The authors declare that ethical review was waived as no personal data were used. No specific funding sources or conflicts of interest are detailed in the provided text, other than the mention that the protocol was registered on PROSPERO.
The easy way to misread this
Do not interpret the high capture rates of HEPA filters as proof of improved patient outcomes in all clinical settings. The meta-analysis showed significant heterogeneity, meaning the studies were too different to produce a single reliable effect size, and the authors themselves label the evidence as preliminary.