The air pollution particle can cause the outbreak of heart disease

The air pollution particle can cause the outbreak of heart disease
Even only suck the very small air pollution particle for 2 hours, can penetrate the lung dirtily and defend the protective screen naturally, and can touch off and have a heart attack. This is the result that cardiovascular epidemiology director Mittleman doctors of Boston Beth Israel Deaconess medical centers wait for recent one and is studied. They and emergency case follow up a case by regular visits to, show to in hospital, exposed to the intersection of pollution and particle and cardiovascular to increase relevant by inches while being critically ill in the air. This is research of dangerous short-term influence to having a heart attack of air pollution of the investigation for the first time. Researcher investigate 772 Boston have a heart attack patient by area between May of 1996 and will it be January 1995, it is probably 4 days after it has a heart attack, in order to confirm they present the time of symptom. The researcher has compared and had a heart attack the time started and every day's air pollution of Boston district and determined the situation, pay special attention to the level of the small pollution particle. Harvard common to defend the intersection of institute and environmental Dockery, professor of epidemiology, explain " little fine grain these to pollute the particle 2.5 (PM2.5) while being what is called ,Because its diameter is smaller than 2.5 microns ( m) " . " whether very much little particle so that can wear defending the mechanism normally of the lung, and can deepen the area or alveolus of air exchange " . Researcher heart disease patient's air pollutions that time started of breaking out measure and " Contrast " A measured value was compared with, 3 days before heart attack begins, the air for 24 hours sampled as the contrast one. The result shows, PM2.5 particle increases 2 hours before symptom breaks out, the danger of heart attack is relatively high. In addition, the researcher observes, as considering PM2.5 exposes time equally in 24 hours, the danger of heart attack increases, this suggestion reacts for a kind of delay to the particle. Combined for two periods of time the window was analyzed to find, when per cubic meter of atmosphere of PM2.5 density in 2 hours increased 25 g before symptom beganned, 48% of dangerous increase of heart attack. The production of the air pollution of the little fine grain is mainly caused by the combustion processes of car engine, power plant, oil plant, smeltery,etc.. Have materials brief on recently, exposed to high PM2.5 of density can increase the intersection of whole body and the intersection of and inflammation, the intersection of blood and viscosity and some protein in the blood, thus cause the thrombus. U.S.A. environmental protection department (EPA) Think, the present acceptable air standard is 65 mg/m3 PM2.5. Mittleman says, even if the density of PM2.5 is lower than this standard, our research reveals the danger of heart attack also increase. " China's medical Tribune "

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