- Systolic BP dropped significantly among residents of a senior facility that used portable air filtration systems for 3 days.
Why this matters
- These inexpensive systems filter out fine particulate matter, which is a risk factor for cardiovascular disease and mortality.
- As would be expected, real air filtration reduced small particulates in the air much more than sham filtration.
- Compared with sham, filtration for 3 days (BP in mmHg) decreased:
- Systolic BP: 3.2 (95% CI, −6.1 to −0.2).
- Diastolic BP: 1.5 (95% CI, −3.3 to 0.2).
- Low efficiency filtration reduced:
- Systolic BP: 3.4 (95% CI, −6.8 to −0.1).
- Diastolic BP: 2.2 (95% CI, −4.2 to −0.3).
- High-efficiency filtration reduced:
- Systolic BP: 2.9 (95% CI, −6.2 to 0.5).
- Diastolic BP: 0.8 (95% CI, −2.8 to 1.2).
- A post-hoc analysis of patients with obesity found even steeper decreases with filtered vs unfiltered air:
- Systolic: −7.5 (95% CI, −12.0 to −3.1).
- Diastolic: −2.9 (95% CI, −5.6 to −0.2).
- Randomized, double-blind crossover trial, 40 people living in a Michigan facility for older adults.
- Outcome: BP.
- Funding: National Institute of Nursing Research.
- Small population.
- Probably not powered to detect clear differences between low/high-efficiency systems.