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【medical-news】二手烟的危害：有据为证
For the first time, researchers have identified structural damage to the lungs caused by secondhand cigarette smoke.
The results of the study, conducted by researchers at the University of Virginia School of Medicine in Charlottesville and The Children's Hospital of Philadelphia in Pennsylvania, were presented at the annual meeting of the Radiological Society of North America (RSNA).
"It's long been hypothesized that prolonged exposure to secondhand smoke may cause physical damage to the lungs, but previous methods of analyzing lung changes were not sensitive enough to detect it," said Chengbo Wang, Ph.D., magnetic resonance physicist in the Department of Radiology at The Children's Hospital of Philadelphia.
In recent years, secondhand smoke has emerged as a public health threat. It has been classified as a carcinogen by the Environmental Protection Agency and has been linked to heart disease, lung cancer and a number of respiratory ailments, including asthma and chronic bronchitis. Children are particularly susceptible to the harmful effects of secondhand smoke. According to the American Lung Association, 35 percent of American children live in homes where regular smoking occurs.
Dr. Wang and colleagues used long-time-scale, global helium-3 diffusion magnetic resonance imaging (MRI) to study the lungs of 43 volunteers, including seven current and former smokers and 36 people who had never smoked, 18 of whom had a high level of exposure to secondhand smoke.
Helium-3 diffusion MRI differs from conventional MRI in that the patient inhales a specially prepared helium gas prior to imaging, and the scanner is adjusted to collect images showing this helium gas in tissue. MR measures how far the helium atoms move, or diffuse, inside the lungs during a specific time period -- 1.5 seconds in this study. Using this method, radiologists and physicists can detect changes deep in the small airways and sacs in the lungs, which can break down, become enlarged and develop holes after prolonged exposure to cigarette smoke. Helium-3 diffusion MRI identifies this damage by measuring the increased distance the helium atoms move.
"With this technique, we are able to assess lung structure on a microscopic level," Dr. Wang said.
For the study, measurements were translated into scores called apparent diffusion coefficient (ADC) values for each of the participants. An increased ADC value indicates that the helium atoms were able to travel farther during the measurement time. Fifty-seven percent of the smokers and 33 percent of the nonsmokers with high exposure to secondhand smoke had ADC values greater than 0.024, suggesting that early lung damage was present. In addition, 14 percent of smokers, 67 percent of high-exposure nonsmokers, and 39 percent of low-exposure nonsmokers had ADC values below 0.0185. Relatively low ADC values in adults are a possible indication of a developing respiratory problem, such as chronic bronchitis or asthma.
"These findings suggest that breathing secondhand smoke can injure your lungs," Dr. Wang said. "Since legislation to limit public exposure to secondhand smoke is still being considered in many states, we hope that our work can be used to add momentum to the drive to pass such legislation."
http://www.medicalnewstoday.com/articles/89930.php Secondhand Smoke翻译成被动吸烟好一点吧 认领，24小时交稿
kingterry wrote:
Secondhand Smoke翻译成被动吸烟好一点吧
Secondhand Smoke Damages Lungs: Novel MRI Technique Offers Proof
新的磁共振技术证明了被动吸烟对肺脏的损伤
For the first time, researchers have identified structural damage to the lungs caused by secondhand cigarette smoke.
这是研究者们首次证明被动吸烟对肺脏的结构性损伤。
The results of the study, conducted by researchers at the University of Virginia School of Medicine in Charlottesville and The Children's Hospital of Philadelphia in Pennsylvania, were presented at the annual meeting of the Radiological Society of North America (RSNA).
这项研究是由弗吉尼亚大学医学院（位于Charlottesville市）和宾夕法尼亚费城儿童医院的研究人员完成的，研究结果在北美放射学会年会上发布。
"It's long been hypothesized that prolonged exposure to secondhand smoke may cause physical damage to the lungs, but previous methods of analyzing lung changes were not sensitive enough to detect it," said Chengbo Wang, Ph.D., magnetic resonance physicist in the Department of Radiology at The Children's Hospital of Philadelphia.
费城儿童医院放射线科的磁共振物理学家Chengbo Wang博士说：“长期以来人们一直猜测延长被动吸烟的时间会引起肺脏物理性损伤，但以前检测肺脏改变的手段都不够灵敏所以没有发现阳性结果。”阅读本文的人还阅读：
作者:admin@医学,生命科学 2011-03-13 05:11
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