<<返回上一页

The weather piles on the pressure

发布时间:2019-03-08 02:05:11来源:未知点击:

By Michael Day IF YOU suffer from heart disease, you’d do well to heed weather forecasts. French scientists have found that rising atmospheric pressure and plunging temperatures spell danger for people at risk of a heart attack. Philippe Amouyel of the University of Lille and his colleagues studied statistics on heart attacks for around 250 000 local men. Over 10 years, 2524 of the men suffered a total of 3314 heart attacks. The researchers compared the timing of the attacks with information on weather patterns during that period. The study showed that a drop in temperature of 10°C increases the risk of heart attack by 13 per cent. Extremes of atmospheric pressure also cause problems. When the pressure falls below 1006 millibars or rises above 1026 millibars, the risk of a heart attack rises by a similar amount. “People at high risk of heart attack, maybe those who’ve had one attack already, should make sure their houses are well heated in winter and wrap up well,” says Amouyel. It’s not entirely clear why weather has these effects. Very cold conditions are thought to make the blood thicker, increasing the likelihood of clots. Amouyel also suggests that extremes of pressure can alter blood pressure, which is a known factor in the risk of heart disease. People with pre-diagnosed heart disease are those most at danger during extreme weather conditions. However Amouyel thinks other people should take note, too. “This is the first study to report an effect of atmospheric changes on the occurrence of heart attacks in the general population, and not just deaths from heart disease,” he says. Studies have shown that very high temperatures also increase heart attack rates, but this trend was not detected in Lille,