Abstract:
Objective To assess the short-term effect of particulate matters with an aerodynamic diameter less than 10 μm (PM10) on emergency ambulance dispatches for cardiovascular diseases (CVDs) and seasonal variations.
Methods The data of daily emergency ambulance dispatches from 2011 to 2014 were collected from Ningbo Emergency Medical Center. A timeseries study using a distributed lag non-linear model was conducted to evaluate the relationship between PM10 and daily emergency ambulance dispatches for CVDs in cold season (from November to April) and warm season (from May to October) after controlling meteorological factors, long-term trend, and day of the week. We also examined the association stratified by sex and age.
Results During the study period, a total of 7 434 cases of CVDs were collected, including 4 123 cases in cold season and 3 311 cases in warm season. In warm season, a 10-μg/m3 increase of PM10 was associated with 2.00% (95%CI: 0.59%-3.42%) increase in emergency ambulance dispatches for CVDs without lag effect identified. No effect was found in full year and cold season. In warm season, the excess risks associated with a 10-μg/m3 increase of PM10 in the males and the≥65 years old age group were 2.41% (95%CI: 0.48%-4.37%) and 1.86% (95%CI: 0.07%-3.69%) respectively. No statistically significant differences were found in the females and those less than 65 years old.
Conclusion These findings suggest that the increase of PM10 are positively associated with the increase of emergency ambulance dispatches for CVDs in warm season; male and the senior may be more sensitive than others.
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