The Characteristics Of VRI In Heavy Smokers With Normal Pulmonary Function

BackgroundVibration response imaging (VRI) is a new lung sound imaging technology which was invented in 2005 by an Israel scholar. It shows the vibration in the lung during respiratory period and outputs the real time information by charts or tables. Now clinical researches about VRI can been found all over the world. But no clinical report which study the VRI characters in heavy smokers whose pulmonary function is normal can be found in China up to date.ObjectiveVibration response imaging(VRI) is a new lung sound imaging technology. The study is preliminarily to explore the image properties of heavy smokers and healthy subjects. Using VRI to detect the heavy smokers with normal pulmonary function after 6 months since they stop smoking successfully and then investigate whether VRI can reflect the influence of smoking to human body.MethodsAll subjects were divided into two groups:heavy smokers whose pulmonary function is normal and healthy non-smokers. First of all, we asked their case history and did physical examination. Then we tested their lung function and checked up their chest X-ray and VRI, tested their VRI again among heavy smokers after 6 months since they stop smoking successfully. Finally, the differences of VRI dynamic imaging among the two groups were analyzed.ResultsQLD of upper right lung, middle right lung, lower right lung, right lung respectively account for (7.17±2.92)%, (14.44±4.25)%, (21.78±5.21)%, (43.39±8.23)%. QLD of upper left lung, middle left lung, lower left lung, left lung respectively account for (11.39±5.15)%, (18.56±3.99)%, (26.33±6.16)%, (56.61±8.23)%. Compared with the non-smokers,the QLD of lower right lung, upper left lung, lower left lung heavy smokers with normal pulmonary function are significantly different(P<0.05).In addition, the number of energy center of the heavy smokers with normal pulmonary function is more than non-smokers. Dynamic imaging in heavy smokers group which appeared disorder, skip, derangement, delay were separately accounted for 16.4%,64.2%,16.4%,14.9%. While in healthy non-smokers group respectively account for 6.7,3.3%,0%,0%.The results between heavy smokers whose pulmonary function is normal and healthy non-smokers were significantly different. The results between heavy smokers group and the non-smoker group were significantly different. The energy peak value ratio of inspiration and expiration phase in heavy smoker group, healthy non-smoker group were respectively 0.56,0.74.ConclusionThe study is preliminarily to explore the image properties of heavy smokers and healthy subjects. VRI can detect the abnormal image of the heavy smokers with normal pulmonary function,and detect image variation of heavy smokers 6 months since they stop smoking successfully.