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Cardiovascular Benefits of Air Purification in Children: Comprehensive Insights from a Randomized, Double-Blind,
Xiaowei Xue1, Jianlong Fang2, Qiutong Li2
1School of Public Health, Key Laboratory of Public Health Safety of the Ministry of Education and Key Laboratory of Health Technology Assessment of the Ministry of Health, Fudan University, Shanghai 200032, China.
Insights
Indoor air purification significantly benefits children's cardiovascular health by reducing blood pressure and improving heart rate variability. These findings suggest air purifiers are a valuable tool for protecting children in polluted environments.
Area of Science:
- Environmental Health
- Pediatric Cardiology
- Public Health
Background:
- Indoor air pollution, particularly fine particulate matter (PM2.5), poses risks to cardiovascular health.
- The specific cardiovascular benefits of indoor air purification in children remain unclear.
Purpose of the Study:
- To investigate the cardiovascular benefits of indoor air purification in children exposed to fine particulate matter (PM2.5).
- To explore the biological mechanisms underlying these cardiovascular improvements.
Main Methods:
- A randomized, double-blind, crossover trial involving healthy children in China.
- Participants underwent two 76-day exposure sessions with and without air purification, separated by a washout period.
- Primary outcomes included blood pressure (BP), heart rate variability (HRV), and electrocardiogram (ECG) parameters; serum protein was a secondary outcome.
Main Results:
- Air purification led to significant reductions in BP (3.86-4.25 mmHg) and QT/QTc intervals (7.23-9.17 ms).
- Improvements were observed in HRV indicators and reductions in ECG amplitudes (RV5, SV1, RV5 + SV1).
- Proteomics revealed associations with modulated pathways of oxidative stress, inflammation, endothelial damage, coagulation, and atherosclerosis.
Conclusions:
- Indoor air purification demonstrates tangible cardiovascular benefits for children.
- These benefits are linked to reduced oxidative stress, inflammation, and improved endothelial function.
- Air purification offers a protective strategy for children's cardiovascular health in areas with high air pollution.
Abstract:
It remains uncertain whether and how indoor air purification improves children's cardiovascular health. We conducted a randomized, double-blind, crossover trial of midterm, all-day, multisetting air purification among healthy children in China to investigate cardiovascular benefits of mitigating fine particulate matter (PM2.5) levels and explore potential biological mechanisms. The participants were cluster-randomized to the intervention or control group and experienced two 76-day exposure sessions separated by an 88-day washout period. High-resolution, real-time indoor PM2.5 levels were monitored. The primary outcomes were blood pressure (BP), heart rate variability (HRV), and electrocardiogram (ECG); the secondary outcome was serum protein. Finally, 79 children were included in the analyses. We found that air purification could decrease BP (3.86-4.25 mmHg), shorten the duration of the QT and QTc intervals (7.23-9.17 ms), reduce the amplitude of RV5, SV1, and RV5 + SV1 (0.11-0.23 mV), and elevate the time- and frequency-domain indicators of HRV (9.62-14.89 ms, 26.42-32.11 ms2, respectively). Proteomics analyses revealed that these benefits were associated with modulations in the pathways of oxidative stress, inflammation, endothelial damage, coagulation, and atherosclerosis. This trial provides evidence of the benefits of air purification on children's cardiovascular systems, offering valuable insights for protective strategies in highly polluted areas.
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