Wednesday, 21 November 2012

China's hot and cold weather increases coronary deaths

Extremely cold and hot temperatures in China's cites increase the rate of deaths from ischaemic heart disease, a study has shown. Researchers from Beijing University examined the effects of extremely cold and hot temperatures on ischaemic heart disease mortality in five cities: Beijing, Tianjin, Shanghai, Wuhan and Guangzhou. After analysing 16,600 deaths they found that relationships between temperature and IHD mortality were different in all five cities.  The threshold for cold-related coronary deaths was lower in northern cities than in southern cities. In Beijing, Tianjin and Guangzhou, the effects of extremely cold temperatures were delayed, while Shanghai and Wuhan had immediate cold effects. The effects of extremely hot temperatures on coronary  deaths were seen immediately in all the cities except Wuhan. Overall, coronary mortality increased by almost 50% in extremely cold temperatures compared with the 1milder temperatures, while coronary mortality increased 18% with extremely hot temperatures compared with normal temperatures.
"Our results are consistent with the hypothesis that people in the north are more susceptible to the effects of hot temperatures and in the south to the effects of cold temperatures," conclude study authors Dr Guo Yuming and Professor Pan Xiaochuan.

Read more: Heart Journal

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