![]() ![]() interstitial lung disease, a group of diseases that cause scarring of the lungs.pulmonary edema, which refers to fluid in the lungs.They may indicate that a person’s lungs have fluid inside them or are not inflating correctly. They mainly occur during inhalation but can also happen during exhalation.Ĭrackles occur as a result of small airways suddenly snapping open. Coarse: Coarse crackles occur in the larger bronchi tubes and are loud, low pitched, and last longer than fine crackles. ![]() The bronchi branch off into smaller and smaller passageways, which eventually lead to air sacs called alveoli. Medium: These result from air bubbling through mucus in the small bronchi - two tubes that carry air from the trachea to the lungs. ![]() Fine crackles may occur more frequently during a breath than coarse crackles and only happen during inhalation.
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