[Association between the concentration of particulate matters and the hospital emergency room visits for circulatory diseases: a case-crossover study].

ABSTRACT

OBJECTIVE: To explore the association between the concentration of particulate matters with an aerodynamic diameter of < 10 microm (PM(10)) and the hospital emergency room visits for circulatory diseases (International Classification of Diseases, tenth vision ICD-10I00-I99) in Beijing, China. METHODS: We collected data for daily hospital emergency room visits of circulatory diseases (ICD-10I00-I99) from Peking University Third Hospital and from the ambient air PM(10) through the Beijing Municipal Environmental Monitoring Center. A time-stratified case-crossover design was used to evaluate associations between circulatory disease health outcomes and PM(10). RESULTS: The no-lagged unidirectional case-crossover design with 14 matched pairs had the highest odds ratios (ORs) between PM(10) and the hospital emergency room visits for circulatory diseases. After adjusting the temperature and the relative humidity, a 10 microg/m(3) increased in the PM(10) were found associated with the emergency room visits on value of ORs of 1.006(95%CI 1.003 - 1.008) for the total circulatory diseases (ICD-10I00-I99), 1.003 (95%CI 0.996 - 1.010) for coronary heart disease (ICD-10I20-I25), 1.005 (95%CI 0.997 - 1.013) for cardiac arrhythmia (ICD-10I47-I49), 1.019 (95%CI 1.005 - 1.033) for heart failure disease (ICD-10I50), and 1.003 (95%CI 0.998 - 1.007) for cerebrovascular diseases (ICD-10I60-I69), respectively. CONCLUSION: These findings suggested that elevated levels of ambient PM(10) were positively associated with hospital emergency room visits for the total number of circulatory diseases and heart failure disease.