Objectives A positive association between air pollution and both the incidence and prevalence of diabetes mellitus (DM) has been reported in some epidemiologic and animal studies, but little research has evaluated the relationship between air pollution and diabetic coma. Diabetic coma is an acute complication of DM caused by diabetic ketoacidosis or hyperosmolar hyperglycemic state, which is characterized by extreme hyperglycemia accompanied by coma. We conducted a time-series study with a generalized additive model using a distributed-lag non-linear model to assess the association between ambient air pollution (particulate matter less than 10 μm in aerodynamic diameter, nitrogen dioxide [NO2], sulfur dioxide, carbon monoxide, and ozone) and emergency department (ED) visits for DM with coma in Seoul, Korea from 2005 to 2009.
Methods The ED data and medical records from the 3 years previous to each diabetic coma event were obtained from the Health Insurance Review and Assessment Service to examine the relationship with air pollutants.
Results Overall, the adjusted relative risks (RRs) for an interquartile range (IQR) increment of NO2 was statistically significant at lag 1 (RR, 1.125; 95% confidence interval [CI], 1.039 to 1.219) in a single-lag model and both lag 0-1 (RR, 1.120; 95% CI, 1.028 to 1.219) and lag 0-3 (RR, 1.092; 95% CI, 1.005 to 1.186) in a cumulative-lag model. In a subgroup analysis, significant positive RRs were found for females for per-IQR increments of NO2 at cumulative lag 0-3 (RR, 1.149; 95% CI, 1.022 to 1.291).
Conclusions The results of our study suggest that ambient air pollution, specifically NO2, is associated with ED visits for diabetic coma.
Summary
Korean summary
본 연구에서는 대기오염물질의 단기적인 영향을 확인하기 위하여 당뇨병성 혼수로 인한 응급실 내원을 시계열적으로 분석하였다.
분석 결과 이산화질소 상승이 노출 1일 후의 응급실 방문을 1.25% 상승시켰다(RR, 1.125; 95% CI 1.039-1.219).
또한, 노출 3일 후까지 누적 결과도 유의한 상관관계를 보였다(RR 1.092; 95% CI, 1.005-1.186).
Citations
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