Man-Hui Li1, Li-Chao Fan2, Bei Mao1, Jia-Wei Yang1, Augustine M K Choi3, Wei-Jun Cao1, Jin-Fu Xu4. 1. Department of Respiratory Medicine, Shanghai Pulmonary Hospital, Tongji University School of Medicine, Shanghai, China; Soochow University, Suzhou, China. 2. Department of Respiratory Medicine, Shanghai Pulmonary Hospital, Tongji University School of Medicine, Shanghai, China. 3. Joan and Sanford I. Weill Department of Medicine, Weill Cornell Medical College and New York-Presbyterian Hospital, New York, NY. 4. Department of Respiratory Medicine, Shanghai Pulmonary Hospital, Tongji University School of Medicine, Shanghai, China; Soochow University, Suzhou, China. Electronic address: jfxucn@gmail.com.
Abstract
BACKGROUND: Many epidemiologic studies have documented variable relationships between ambient particulate matter (PM) and COPD hospitalizations and mortality in cities worldwide. METHODS: Comprehensive and systematic searches were performed in the electronic reference databases (PubMed, EMBASE, Google Scholar, Ovid, and Web of Science) with specific search terms and selection criteria for relevant studies. Summary ORs and 95% CIs were calculated to evaluate the relationship between short-term exposure to PM with aerodynamic diameters ≤ 2.5 μm (PM2.5) and COPD hospitalizations and mortality. The sources of heterogeneity and the effect of potential confounders were explored using subgroup analyses. Study findings were analyzed using a random effects model and a fixed effects model in COPD hospitalizations and mortality, respectively. RESULTS: The search yielded 12 studies suitable for meta-analysis of hospitalizations and six studies suitable for the mortality meta-analysis until April 15, 2015. A 10-μg/m(3) increase in daily PM2.5 (lag days 0-7) was associated with a 3.1% (95% CI, 1.6%-4.6%) increase in COPD hospitalizations and a 2.5% (95% CI, 1.5%-3.5%) increase in COPD mortality. Significant publication bias was not found in studies focusing on the relationship between short-term PM2.5 exposure and COPD hospitalizations and mortality. CONCLUSIONS: Our combined analysis indicated that short-term exposure to a 10-μg/m(3) increment of ambient PM2.5 is associated with increased COPD hospitalizations and mortality. Further study is needed to elucidate to what extent this relationship is causal, together with other factors, and to elucidate the mechanism by which PM2.5 induces activation of cellular processes promoting COPD exacerbations.
BACKGROUND: Many epidemiologic studies have documented variable relationships between ambient particulate matter (PM) and COPD hospitalizations and mortality in cities worldwide. METHODS: Comprehensive and systematic searches were performed in the electronic reference databases (PubMed, EMBASE, Google Scholar, Ovid, and Web of Science) with specific search terms and selection criteria for relevant studies. Summary ORs and 95% CIs were calculated to evaluate the relationship between short-term exposure to PM with aerodynamic diameters ≤ 2.5 μm (PM2.5) and COPD hospitalizations and mortality. The sources of heterogeneity and the effect of potential confounders were explored using subgroup analyses. Study findings were analyzed using a random effects model and a fixed effects model in COPD hospitalizations and mortality, respectively. RESULTS: The search yielded 12 studies suitable for meta-analysis of hospitalizations and six studies suitable for the mortality meta-analysis until April 15, 2015. A 10-μg/m(3) increase in daily PM2.5 (lag days 0-7) was associated with a 3.1% (95% CI, 1.6%-4.6%) increase in COPD hospitalizations and a 2.5% (95% CI, 1.5%-3.5%) increase in COPD mortality. Significant publication bias was not found in studies focusing on the relationship between short-term PM2.5 exposure and COPD hospitalizations and mortality. CONCLUSIONS: Our combined analysis indicated that short-term exposure to a 10-μg/m(3) increment of ambient PM2.5 is associated with increased COPD hospitalizations and mortality. Further study is needed to elucidate to what extent this relationship is causal, together with other factors, and to elucidate the mechanism by which PM2.5 induces activation of cellular processes promoting COPD exacerbations.
Authors: Nirupama Putcha; Han Woo; Meredith C McCormack; Ashraf Fawzy; Karina Romero; Meghan F Davis; Robert A Wise; Gregory B Diette; Kirsten Koehler; Elizabeth C Matsui; Nadia N Hansel Journal: Am J Respir Crit Care Med Date: 2022-02-15 Impact factor: 21.405
Authors: Élida Campos; Carlos Alexandre R Pereira; Carmen Freire; Ilce F da Silva Journal: Int J Environ Res Public Health Date: 2021-04-28 Impact factor: 3.390