Airflow-Generated Sound in a Hollow Canine Airway Cast

Posted by James

The characteristic sound heard on the chest wall during breathing is known as the vesicular lung sound. Although the name implies that the source of the sound is the alveolar sacs (vesicles), the true source is not known. Several attempts at defining the site of origin has resulted in indirect evidence that the intrapulmonic airways generate the loudest compo­nent of the inspiratory sound in human lungs and that the expiratory component may arise from larger airways. To better define the source of these sounds, we decided to examine the spatial distribution of airflow-generated sound within a specially con­structed, hollow flexible model of canine airways. The model permitted the isolated study of airflow-gener­ated sounds free of the confounding influence of pulmonary parenchyma and other biologic noises.
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