Lam HCY, et al. - Researchers performed a time series study utilizing information on all 53,769 hospital admissions for acute myocardial infarction (AMI) to public hospitals in Hong Kong from 2002 to 2011 and meteorological and pollutant data for the same time period to compare excess risk of AMI during periods of extreme temperatures between patients with diabetes mellitus (DM) and without DM. During extreme temperatures, DM patients had a higher increased risk of AMI admissions than non-DM patients. It was observed that AMI admissions among DM patients rise abruptly in both high and low temperatures, with low temperatures having a more robust effect. On the other hand, AMI risk among non-DM patients was only mildly increased at low temperatures. Study findings suggested that health protection guidelines should alert DM subjects and medical practitioners about the dangers of extreme temperatures.