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Cold and humidity increase the risk of stroke

May 18th 2014 at 9:19 PM

In very cold, high humidity and sudden temperature changes in a day increases the risk of stroke, according to a new U.S. scientific research, connecting time the likelihood of such an event. As the thermometer rises and the humidity falls, the lower the risk of a stroke, causing the brain to become more frequent in winter and less often in the summer.

Researchers universities Yale, Harvard and Duke, led by Judith Lichtman, presented their findings international conference on the brain, organized by the American Heart Association in California. This is the largest study done to date on the relationship Forecast -

brain, which was based on the association of meteorological data with hospital records concerning imports of 134,500 patients for ischemic stroke in 2009-2010. "Weather is not something that people usually associate with the risk of stroke, but found that the weather is actually amongĀ

those many factors that increase hospital admissions for stroke, "said Lichtman, associate professor of epidemiology at the School of Public Health, Yale University. When do cold, the blood vessels constrict, which raises blood pressure and thus the risk of stroke. More generally, the extreme weather conditions can trigger cardiovascular stress response in the body, and cause the release of substances that make the blood more viscous and therefore more likely to have thrombosis

. Analogous effects have stressful on the cardiovascular system and the high humidity. The most common form of stroke is ischemic, caused when a blood clot blocks the blood circulation in the brain, while more rarely hemorrhagic strokes, when ruptured blood vessels in the brain. Study found that: -

The lowest annual temperatures increase both hospital admissions, and deaths from stroke. - For every increase in the average temperature by one degree Fahrenheit (equivalent to about half a degree Celsius), reduced by 0.86% the probability of hospitalization by 1.1% and the probability of death due to stroke. -

The greater the average level of moisture in the atmosphere increases, the risk of stroke. - Still, the larger daily temperature changes (ie the difference upper and lower temperature within 24 hours), the greater the risk. "People at risk of stroke would be better to avoid being exposed to significant

changes in temperature and high humidity," said Lichtman. At high risk for stroke are those who have high blood pressure or high cholesterol, smokers, have diabetes, heart disease, poor nutrition do not brought physically,

have extra weight and drink too much alcohol. Symptoms of stroke include "hanging" of the person sudden weakness of arms or legs, difficulty speaking, mental confusion, difficulty sharp vision in one eye or both, difficulty walking, loss of balance, dizziness, sudden unexplained headache etc.

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