Several investigators in the past have suggested different techniques to assess to status of the small airways (2-3 mm diameter). These are the site of diseases such as chronic bronchitis, emphysema and some cases of asthma. However, the contribution of these small airways is less than 20% of the total resistance to breathing, since the total cross-sectional area is very large. Thus, it is not possible to measure the small changes occurring in these peripheral units as a part of the total resistance measured during opontaneous breathing. A. J. Woolcock et al. showed that dynamic jcompliance (C//d//y//n) decreases at higher breathing frequencies (up to 100 breaths/min) in subjects whose predominant disease is in the small airways. The frequency dependence of C//d//y//n is now the accepted test for the sensitive detection of small airway diseases. The authors have investigated a new technique which could be more sensitive compared to this test for the detection of events occurring in the peripheral (small) airways.
|Number of pages
|Journal of Sound and Vibration
|Published - 1979
|IEEE Eng in Med and Biol Soc Annu Conf, 1st, Fron of Eng in Health Care - Denver, CO, USA
Duration: Oct 6 1979 → Oct 7 1979