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Mortality rates increase due to extreme heat and cold
Date:7/29/2014

Epidemiological studies have repeatedly shown that death rates rise in association with extremely hot weather. The heat wave in Western Europe in the summer of 2003, for example, resulted in about 22,000 extra deaths. A team of researchers led by Dr. Alex-andra Schneider at the Institute of Epidemiology II at the Helmholtz Zentrum Mnchen examined the impact of extreme temperatures on the number of deaths caused by cardiovascular disease in three Bavarian cities and included both high and low temperatures in the study.

"Our findings confirm the results of our previous studies, which indicated that the eld-erly and people with pre-existing medical conditions respond particularly sensitively to heat and cold," says Alexandra Schneider. "If you are aware of the effects of air tem-perature on health, you can identify population subgroups who are particularly at risk and take preventive action."

The elderly are particularly at risk

Dr. Susanne Breitner, Dr. Alexandra Schneider and Prof. Annette Peters evaluated almost 188,000 deaths due to cardiovascular disease between 1990 and 2006 in the cities of Munich, Nuremberg, and Augsburg. They were able to demonstrate that when temperatures rose from 20C to 25C or fell from -1C to -8C, the number of deaths from cardiovascular disease increased significantly by 9.5% and 7.9%, respectively. While the effects of the heat lasted for one or two days, the effects of cold weather lasted for up to two weeks. Elderly people were most affected. The impact on death rates due to heart failure, arrhythmia and stroke was particularly striking.

The mechanisms that cause these deaths, however, are not yet fully understood. Up to now it has been known that high temperatures, amongst other things, can affect the blood-clotting mechanism (haemostasis) and make the blood more viscous, thereby increasing the risk of thrombosis. Furthermore, as decreasing temperatures have an impact on blood pressu
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Contact: Dr. Susanne Breitner
susanne.breitner@helmholtz-muenchen.de
49-893-187-4481
Helmholtz Zentrum Mnchen - German Research Center for Environmental Health
Source:Eurekalert

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