Crackles

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Crackles

Crackles (pronounced: /ˈkrækəlz/), also known as Rales, are abnormal lung sounds characterized by discontinuous clicking or rattling sounds. They are often heard during inhalation and are indicative of various pulmonary diseases.

Etymology

The term "crackles" is derived from the crackling sound that is produced. The term "rales" is from the French word "râles" and means "rattle".

Definition

Crackles are the clicking, rattling, or crackling noises that may be made by one or both lungs of a human with a respiratory disease during inhalation. They are usually heard with a stethoscope. They can be fine (high-pitched and short in duration) or coarse (low-pitched and longer in duration).

Causes

Crackles are caused by the "popping open" of small airways and alveoli collapsed by fluid, exudate, or lack of aeration during expiration. Some conditions that can cause crackles include Pneumonia, Heart failure, Bronchitis, and Pulmonary fibrosis.

Diagnosis

Crackles are often detected through physical examination using a stethoscope. Further diagnostic tests such as a Chest X-ray or CT scan may be required to determine the underlying cause.

Related Terms

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