![]() ![]() However, as previously discussed, this is a misnomer since the alveoli do not generate these sounds. Laennec originally believed that these sounds were produced by air flowing through the alveoli, hence the name. The term “vesicular breath sound” was coined by René Laennec, the inventor of the stethoscope. The quality of vesicular breath sounds can be likened to the sound of rustling dry leaves, a gentle and continuous noise. This shorter expiratory phase is due to the high-pitched sounds produced in the latter two-thirds of expiration being filtered out, leaving the low-pitched sounds more prominent. Notably, the expiratory phase in vesicular breathing is shorter than the inspiratory phase. Characteristically, it is soft and has a low pitch (low frequency). The vesicular breath sound is recognized as the normal breath sound heard over most lung fields during auscultation. ![]() Normal Breath Sounds Vesicular Breath Sounds Understanding this fundamental concept is crucial for discussing the origin of abnormal sounds in different conditions, which will be explored in subsequent sections of this article. This altered sound is referred to as the vesicular breath sound.
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