11/9/2023 0 Comments Moist rales lung sounds![]() ![]() There are also some other lung sounds, chest rubs for instance.įor a long time there have been a lot of researches on lung sounds and its pathologic causes 25 - 27. Coarse crackle is discontinuous sound called moist rale while the others are continuous sound called dry rale. In 1985, adventitious sounds, a kind of additional noise in periodic signal 24, was principally identified by The 10th International Respiratory Voice Association as: coarse crackle, fine crackle, wheeze, and rhonchus. The abnormal lung sounds consists of weaken and vanished sound, prolongement expiratoire and tubular breathing sound. The normal lung sounds primarily include three categories: vesicular breathing sound, bronchial breathing sound and tracheal sound. Table Table1 1 shows the lung sound categories in detail 23. The abnormal and the adventitious lung sounds are produced when there exist problems or something unfit in human body. Normal lung sound is mainly generated from the airflow through principle bronchi, bronchiole and lung in the respiratory system 22. Taking health condition into consideration, lung sounds are mainly classified into three types: normal, abnormal and adventitious 20, 21. With more researches on its classification there came various supplement and modification on lung sound categories 13 - 19. ![]() The classification of lung sounds could be dated back in 1819 when Leannec published Indirect Auscultation sorting it into five kinds. During diagnosis process, it is helpful for accurately judging characteristic vectors and determining disease reasons to de-noise lung sounds and abstract vibration frequency, sound waves amplitude and amplitude gradient 9 - 12. Therefore, it will be helpful to develop an efficient method to recognize lung sounds and to diagnose related diseases based on the analysis of the more informative lung sounds data collected by electronic stethoscope and develop an efficient way to recognize lung sounds and its related diseases 7, 8. However, conventional auscultation of lung sounds has a very limited usage because of the limitation of information it can obtain, its dependence on physician's experience, and its high rate of misdiagnosis. With the increasing incidence of respiratory system diseases 6, more attention is being paid on the harmless diagnosis method based on analysis of lung sounds which contains abundant information on lung condition. Crude death rates of diseases in city and rural
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