Association between ambient temperature and emergency room visits of total and cause-specific cardiovascular disease: A time-series study in Lanzhou, China

Abstract

This study focused on Lanzhou, China, and assessed the associations between daily mean temperature and emergency room (ER) visits due to total and cause-specific cardiovascular diseases (CVD) from 2013 to 2019. The quasi-Poisson generalized additive model (GAM) combined with distributed lag non-linear model (DLNM) was used to examine the effects of ambient temperature and total and cause-specific cardiovascular ER visits. We calculated the relative risks (RR) at cold (hot) temperature comparing the 5th (95th) centile of temperature with the minimum morbidity temperature (MMT). Inverted U-shaped or irregular M-shaped exposure-response curves were observed between temperature and total and cause-specific CVD ER visits in Lanzhou, China.For people with total CVD, HRD or CD, females were more sensitive to temperature than male, for IHD and HF, males are more vulnerable to temperature. The <65 years old with total CVD, IHD, HRD, or CD were more susceptible to the effect of temperature. The results showed that the relationship between temperature and total and cause-specific CVD was nonlinear. Cold temperatures had longer-lasting effects on morbidity, whereas hot temperatures had acute and short-term effects. The susceptibility to temperature varied across disease subtype, gender, and age.So the implementation of targeted interventions and regular monitoring of health risks at non-optimal temperatures is crucial for informing urban public health policy.