文章来源:未知 文章作者:meng 发布时间:2010-08-11 03:19 字体: [ ]  进入论坛

A drop in the average temperature outside is linked to a higher risk of people having heart attacks, according to a new study published on bmj.com today. UK researchers found that each 1°C reduction in temperature on a single day is associated with around 200 extra heart attacks.

In the light of(依据,按照) global climate change, the relations between weather and health are of increasing interest. Previous studies have shown that ambient(周围的,外界的) outdoor temperature is linked to mortality risk in the short term, with both hot and cold days having an effect, but the effect of temperature on the risk of myocardial infarctions(心肌梗塞) (heart attacks) is unclear.

Researchers from the London School of Hygiene1 and Tropical Medicine carried out a study to examine the short term relation between ambient temperature and risk of heart attack.

They analysed data on 84,010 hospital admissions for heart attack recorded in the Myocardial Ischaemia National Audit2 Project (MINAP) during 2003-2006, and daily temperatures from the British Atmospheric3 Data Centre, focusing on 15 geographical4 areas in England and Wales.

The results were adjusted to take into account factors such as air pollution, influenza5 activity, seasonality6 and long term trends.

The researchers found that a 1°C reduction in average daily temperature was associated with a cumulative7 2% increase in risk of heart attack for 28 days. The highest risk was within two weeks of exposure.

The heightened risk may seem small, but the UK has an estimated 146,000 heart attacks a year and 11,600 events in a 29 day period, so even a small increase in risk translates to substantial numbers of extra heart attacks, around 200 for each 1°C reduction in temperature nationwide on a single day.

Older people between the ages of 75 and 84 and those with previous coronary heart disease(冠心病) seemed to be more vulnerable to the effects of temperature reductions, while people who had been taking aspirin8 long-term were less vulnerable.

The researchers found no increase in the risk of heart attacks at higher temperatures, possibly because temperature in the UK is rarely very high in global terms.

In conclusion, they say "our study shows a convincing short term increase in risk of myocardial infarction associated with lower ambient temperature, predominantly(主要地,显著地) operating in the two weeks after exposure."

They call for further studies to help shed light on the role of adaptive measures such as clothing and home heating, and further clarify which groups are likely to be the most vulnerable.

In an accompanying editorial, Dr Paola Michelozzi and Manuela De Sario, of the Lazio Region Department of Epidemiology in Rome, write: Heat and cold exposure affect people with cardiovascular diseases and increase the incidence of coronary events with high impact on short term mortality. Moreover, while the effect of cold on myocardial infarction is well documented, the short-term effect of heat is still contradictory9 but cannot be disregarded(忽视,不尊重) .

This is even more relevant under climate change scenarios10 that predict a decrease of cold related mortality that will be outweighed11 by an increase in cardiovascular mortality and morbidity12 associated with increased frequency and intensity13 of heat waves.

Clinicians should be aware that exposure to environmental heat and cold is a risk factor for cardiovascular disease and should consider this in risk prevention and management, and efforts should be especially directed towards most vulnerable individuals identified by a multiplicity of risk factors.


1 hygiene Kchzr     
n.健康法,卫生学 (a.hygienic)
  • Their course of study includes elementary hygiene and medical theory.他们的课程包括基础卫生学和医疗知识。
  • He's going to give us a lecture on public hygiene.他要给我们作关于公共卫生方面的报告。
2 audit wuGzw     
  • Each year they audit our accounts and certify them as being true and fair.他们每年对我们进行账务审核,以确保其真实无误。
  • As usual,the yearly audit will take place in December.跟往常一样,年度审计将在十二月份进行。
3 atmospheric 6eayR     
  • Sea surface temperatures and atmospheric circulation are strongly coupled.海洋表面温度与大气环流是密切相关的。
  • Clouds return radiant energy to the surface primarily via the atmospheric window.云主要通过大气窗区向地表辐射能量。
4 geographical Cgjxb     
  • The current survey will have a wider geographical spread.当前的调查将在更广泛的地域范围內进行。
  • These birds have a wide geographical distribution.这些鸟的地理分布很广。
5 influenza J4NyD     
  • They took steps to prevent the spread of influenza.他们采取措施
  • Influenza is an infectious disease.流感是一种传染病。
6 seasonality 8255e9fd0a7b18c1992037f2309fd02a     
  • a high degree of climatic seasonality 明显的季节性气候变化
  • Confinement. Seasonality of tourist trade, animals often 'contracted' to work. 限制,在旅游旺季时,动物们通常都得被迫“上工”。 来自互联网
7 cumulative LyYxo     
  • This drug has a cumulative effect.这种药有渐增的效力。
  • The benefits from eating fish are cumulative.吃鱼的好处要长期才能显现。
8 aspirin 4yszpM     
  • The aspirin seems to quiet the headache.阿司匹林似乎使头痛减轻了。
  • She went into a chemist's and bought some aspirin.她进了一家药店,买了些阿司匹林。
9 contradictory VpazV     
  • The argument is internally contradictory.论据本身自相矛盾。
  • What he said was self-contradictory.他讲话前后不符。
10 scenarios f7c7eeee199dc0ef47fe322cc223be88     
  • Further, graphite cores may be safer than non-graphite cores under some accident scenarios. 再者,根据一些事故解说,石墨堆芯可比非石墨堆芯更安全一些。 来自英汉非文学 - 环境法 - 环境法
  • Again, scenarios should make it clear which modes are acceptable to users in various contexts. 同样,我们可以运用场景剧本来搞清楚在不同情境下哪些模式可被用户接受。 来自About Face 3交互设计精髓
11 outweighed ab362c03a68adf0ab499937abbf51262     
v.在重量上超过( outweigh的过去式和过去分词 );在重要性或价值方面超过
  • This boxer outweighed by his opponent 20 pounds. 这个拳击选手体重比他的对手重20磅。 来自《简明英汉词典》
  • She outweighed me by ten pounds, and sometimes she knocked me down. 她的体重超过我十磅,有时竟把我撞倒。 来自百科语句
12 morbidity OEBxK     
  • MC's also significantly reduce the morbidity and mortality induced by honeybee venom. 肥大细胞同样也能显著降低蜜蜂毒液诱发疾病的发病率和死亡率。 来自互联网
  • The result shows that incidence of myopia morbidity is 44.84%. 结果表明:近视眼的发病率为44.84%。 来自互联网
13 intensity 45Ixd     
  • I didn't realize the intensity of people's feelings on this issue.我没有意识到这一问题能引起群情激奋。
  • The strike is growing in intensity.罢工日益加剧。