Impact of Airflow Rate on Amplitude and Regional Distribution of Normal Lung Sounds

In computerized lung sound research, the usage of a pneumotachograph, defining the phase of respiration and airflow velocity, is essential. To obviate its need, the influence of airflow rate on the characteristics of lung sounds is of great interest. Therefore, we investigate its effect on amplitude and regional distribution of normal lung sounds. We record lung sounds on the posterior chest of four lung-healthy male subjects in supine position with a 16-channel lung sound recording device at different airflow rates. We use acoustic thoracic images to discuss the influence of airflow rate on the regional distribution. At each airflow rate, we observe louder lung sounds over the left hemithorax and a constant regional distribution above an airflow rate of 0 .7 l/s. Furthermore, we observe a linear relationship between the airflow rate and the amplitude of lung sounds.

[1]  Franz Pernkopf,et al.  A Robust Multichannel Lung Sound Recording Device , 2016, BIODEVICES.

[2]  T. Aljama-Corrales,et al.  Asymmetry in lung sound intensities detected by respiratory acoustic thoracic imaging (RATHI) and clinical pulmonary auscultation , 2008, 2008 30th Annual International Conference of the IEEE Engineering in Medicine and Biology Society.

[3]  Y.P. Kahya,et al.  A Multi-Channel Device for Respiratory Sound Data Acquisition and Transient Detection , 2005, 2005 IEEE Engineering in Medicine and Biology 27th Annual Conference.

[4]  S. Charleston-Villalobos,et al.  Respiratory acoustic thoracic imaging (RATHI): Assessing deterministic interpolation techniques , 2004, Medical and Biological Engineering and Computing.

[5]  R. Murphy,et al.  Computerized multichannel lung sound analysis. Development of acoustic instruments for diagnosis and management of medical conditions. , 2007, IEEE engineering in medicine and biology magazine : the quarterly magazine of the Engineering in Medicine & Biology Society.

[6]  José Antonio Fiz,et al.  Effect of body position on lung sounds in healthy young men. , 2008, Chest.

[7]  Zahra Moussavi,et al.  Relationship between airflow and normal lung sounds , 2002, IEEE CCECE2002. Canadian Conference on Electrical and Computer Engineering. Conference Proceedings (Cat. No.02CH37373).

[8]  S. Kraman,et al.  The relationship between airflow and lung sound amplitude in normal subjects. , 1984, Chest.

[9]  S. Charleston-Villalobos,et al.  Respiratory acoustic thoracic imaging (RATHI): Assessing intrasubject variability , 2008, 2008 30th Annual International Conference of the IEEE Engineering in Medicine and Biology Society.

[10]  Y Ploysongsang,et al.  Airflow and normal lung sounds. , 1988, The American review of respiratory disease.

[11]  H. Pasterkamp,et al.  Measurement of respiratory acoustical signals. Comparison of sensors. , 1993, Chest.

[12]  N Gavriely,et al.  Airflow effects on amplitude and spectral content of normal breath sounds. , 1996, Journal of applied physiology.

[13]  Meirav Yosef,et al.  Effect of Airflow Rate on Vibration Response Imaging in Normal Lungs , 2009, The open respiratory medicine journal.