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Niveles de Alerta Antiterrorista en España. Nivel Actual 4 de 5.

Niveles de Alerta Antiterrorista en España. Nivel Actual 4 de 5.
Fuente Ministerio de Interior de España

miércoles, 19 de septiembre de 2012

Extreme temperatures may raise risk of premature cardiovascular death

Extreme temperatures may raise risk of premature cardiovascular death

Study Highlights:
  • Extreme temperatures may increase the risk of premature cardiovascular death.
  • Heat waves pose a greater risk of cardiovascular-related death than do cold spells.
EMBARGOED UNTIL 3 pm CT/4 pm ET, Tuesday, September 18, 2012 
DALLAS, Sept. 18, 2012 — Extreme temperatures during heat waves and cold spells may increase the risk of premature cardiovascular disease (CVD) death, according to new research in Circulation: Cardiovascular Quality and Outcomes, an American Heart Association journal.
The study in Brisbane, Australia, is the first in which researchers examined the association between daily average temperature and “years of life lost” due to CVD.  Years of life lost measures premature death by estimating years of life lost according to average life expectancy.
The findings are important because of how the body responds to temperate extremes, the growing obesity trend and the earth’s climate changes, said Cunrui Huang, M.Med., M.S.P.H., the study’s lead researcher and a Ph.D. scholar at the School of Public Health and Institute of Health and Biomedical Innovation at Queensland University of Technology (QUT) in Brisbane, Australia. 
Exposure to extreme temperatures can trigger changes in blood pressure External link, blood thickness, cholesterol External link and heart rate External link, according to previous research.
“With increasing rates of obesity and related conditions, including diabetes, more people will be vulnerable to extreme temperatures and that could increase the future disease burden of extreme temperatures,” Huang said.
Researchers collected data on daily temperatures in Brisbane, Australia between 1996 and 2004 and compared them to documented cardiovascular-related deaths for the same period.
Brisbane has hot, humid summers and mild, dry winters. The average daily mean temperature was 68.9 degrees Fahrenheit (20.5 degrees Celsius), with the coldest 1 percent of days (53 °F /11.7 °C) characterized as cold spells and the hottest 1 percent (84.5°F/ 29.2 °C ) heat waves.
Per 1 million people, 72 years of life were lost per day due to CVD, researchers said. 
Risk of premature CVD death rose more when extreme heat was sustained for two or more days, researchers found.
“This might be because people become exhausted due to the sustained strain on their cardiovascular systems without relief, or health systems become overstretched and ambulances take longer to reach emergency cases,” said Adrian G. Barnett, Ph.D., co-author of the study and associate professor of biostatistics at QUT. “We suspect that people take better protective actions during prolonged cold weather, which might be why we did not find as great a risk of CVD during cold spells.”
Spending a few hours daily in a temperate environment can help reduce heat- and cold-related illnesses and deaths, Barnett said.
Researcher acknowledged that the findings may not apply to other communities and that they only considered deaths where CVD was the underlying cause.
Other co-authors are: Xiaoming Wang, Ph.D. and Shilu Tong, Ph.D. Funding and author disclosures are on the manuscript.
Learn about protecting your heart in the heat External link and the impact of cold weather on cardiovascular disease External link. For the latest heart and stroke news, follow us on twitter: @HeartNews External link.
Statements and conclusions of study authors published in American Heart Association scientific journals are solely those of the study authors and do not necessarily reflect the association’s policy or position. The association makes no representation or guarantee as to their accuracy or reliability. The association receives funding primarily from individuals; foundations and corporations (including pharmaceutical, device manufacturers and other companies) also make donations and fund specific association programs and events. The association has strict policies to prevent these relationships from influencing the science content. Revenues from pharmaceutical and device corporations are available at External link.
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