In some diseases, the peripheral airways collapse on expiration due either to interstitial fibrosis or secretions/fluid in the peripheral airways. ![]() Because rhonchi are caused by airway secretions, they can usually be heard both during the inspiratory phase and expiratory phases (biphasic).Ĭrackles are interrupted and non-musical quality sounds, and are usually Inspiratory. This causes a lower-pitched vibrating sound on auscultation that is similar to snoring. The difference between the two is that rhonchi are typically associated with secretions that obstruct the larger airways. Sonorous Wheeze (Rhonchi) – Low Pitched The sonorous wheeze, also commonly referred to as rhonchi, is caused by the same expansion and narrowing of the airways as sibilant wheezes.As the airways contract during exhalation and airflow increases, it produces a high-pitched wheeze. ![]() During inspiration, the elasticity of the airways will cause them to dilate, which will allow air to flow around the obstruction. Mechanism: They are caused by the narrowing of airways around obstructions. They are characterized by a high-pitched, continuous sound that occurs either at the end of inspiration or during the expiratory phase. Sibilant Wheeze – High-Pitched wheeze The sibilant wheeze is the wheeze that most healthcare professionals are familiar with as heard in bronchial asthma. ![]() They are caused by a partial obstruction in the airways that is commonly either due to secretions or bronchoconstriction. Wheezes are classified as either sibilant wheezes or sonorous wheezes ( rhonchi). Wheezes are whistling quality sounds heard on auscultation, but sometimes can be audible without the help of a stethoscope.
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