Systemic effects of controlled exposure to diesel exhaust: a meta-analysis from randomized controlled trials.

Abstract:

INTRODUCTION:Ambient air pollution is associated with adverse cardiovascular events. This meta-analysis aimed to investigate the short-term association between air pollution and cardiovascular effects on healthy volunteers. METHODS:We searched databases to identify randomized trials with controlled human exposures to either of two models for studying ambient particulate matter: diesel-exhaust or concentrated ambient particles. Estimates of size effect were performed using standardized mean difference (SMD). Heterogeneity was assessed with I2 statistics. Outcomes were vascular function estimated by forearm blood flow (FBF), blood pressure, heart rate, and blood analysis. RESULTS:Database searches yielded 17 articles (n = 342) with sufficient information for meta-analyses. High levels of heterogeneity for the some outcomes were analyzed using random-effects model. The pooled effect estimate showed that short-term exposure to air pollution impaired FBF response from 2.7 to 2.5 mL/100 mL tissue/min (SMD 0.404; p = .006). There was an increase in 5000 platelet/mm3 following pollution exposure (SMD 0.390; p = .050) but no significant differences for other outcomes. CONCLUSION:Controlled human exposures to air pollution are associated with the surrogates of vascular dysfunction and increase in platelet count, which might be related to adverse cardiovascular events. Given the worldwide prevalence of exposure to air pollution, these findings are relevant for public health. KEY MESSAGES Controlled exposure to air pollution impairs vasomotor response, which is a surrogate for adverse cardiovascular events. This is the first meta-analysis from randomized clinical trials showing short-term association between air pollution and cardiovascular effects on healthy volunteers. Given the worldwide prevalence of exposure to air pollution, this finding is important for public health.

journal_name

Ann Med

journal_title

Annals of medicine

authors

Vieira JL,Macedo FY,Benjo AM,Guimarães GV,Contreras JP,Bocchi EA

doi

10.1080/07853890.2016.1252054

subject

Has Abstract

pub_date

2017-03-01 00:00:00

pages

165-175

issue

2

eissn

0785-3890

issn

1365-2060

journal_volume

49

pub_type

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