![]() The expiratory phase is shorter because the breath sounds produced in the latter 2/3 of expiration are mainly composed of high-pitched sounds which are filtered out. It is soft and low-pitched (low frequency), and the expiratory phase is shorter than the inspiratory phase. Vesicular breath sound is the normal breath sound, heard over most of the lung fields during auscultation. Normal Breath Sounds Vesicular Breath Sounds If you remember this basic concept, we shall discuss the genesis of abnormal sounds in each condition in the subsequent sections of this article. We call this changed (attenuated) sound – vesicular breath sound. While they are conducting through these tissues, some (high) frequencies of sound are absorbed (attenuated) and the character of the sound changes. The bronchial breath sounds produced at the major airways have to travel all across the tissues (through the air in the bronchi, bronchioles, alveolar walls, etc.) to reach the body surface from where we auscultate them.
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