Bilateral asymmetry of respiratory acoustic transmission
- 50 Downloads
Sonic noise transmission from the mouth to six sites on the posterior chest wall is measured in 11 healthy adult male subjects at resting lung volume. The measurement sites are over the upper, middle and lower lung fields and are symmetric about the spine. The ratios of transmitted sound power to analogous sites over the right (R) and left (L) lung fields are estimated over three frequency bands: 100–600 Hz (low), 600–1100 Hz (mid) and 1100–1600 Hz (high). A R-L dominance in transmission is measured at low frequencies, with a statistically significant difference observed at the upper site. No significant asymmetry is observed in any measurement site at mid or high frequencies. A theoretical model of sound transmission that includes the asymmetrical anatomy of the mediastinal structures is in agreement with the observed asymmetry at low frequencies. These findings suggest that the pathway of the majority of sound transmission from the trachea to the chest wall changes from a more radial to airway-borne route over the measured frequency range.
KeywordsAcoustic transmission Asymmetry Lung sounds Respiratory sounds
Unable to display preview. Download preview PDF.
- Cohen, A., andBerstein, A. D. (1991): ‘Acoustic transmission of the respiratory system using speech stimulation,’IEEE Trans.,BME-38, pp. 126–132Google Scholar
- Kraman, S. S. (1983): ‘Speed of low-frequency sound through the lungs of normal men,’J. Appl. Physiol.,55, pp. 1862–1867Google Scholar
- Kraman, S. S., andAustrheim, O. (1983): ‘Comparison of lung sound and transmitted sound amplitude in normal men,’Am. Rev. Respir. Dis.,128, pp. 451–454Google Scholar
- McMinn, R. M. H., andHutchings, R. T. (1988): ‘Color atlas of human anatomy’ (Yearbook Medical Publishers, Weert, Netherlands) p. 186Google Scholar
- Ploysongsang, Y., Martin, R. R., Ross, W. R. D., Louden, R. G. andMacklem, P. T. (1977): ‘Breath sounds and regional ventilation,’Amer. Rev. Respir. Dis.,10, pp. 187–199Google Scholar
- Rosner, B. (1982): ‘Fundamental of biostatistics’ (Duxbury Press, Boston) pp. 242–246Google Scholar
- Wodicka, G. R., Stevens, K. N., Golub, H. L., Cravalho, E. G., andShannon, D. C. (1989): ‘A model of acoustic transmission in the respiratory system,’IEEE Trans.,BME-36, pp. 925–934Google Scholar
- Wodicka, G. R., Stevens, K. N., Golub, H. L., andShannon, D. C. (1990): ‘The spectral characteristics of sound transmission in the intact human respiratory system,’,BME-37, pp. 1130–1135Google Scholar
- Wodicka, G. R., andShannon, D. C. (1990): ‘Transfer function of sound transmission in subglottal human respiratory system at low frequencies,’J. Appl. Physiol.,69, pp. 2126–2130Google Scholar